Glass ceramic with transmittance close to that of glass precursor and preparation method thereof

文档序号：1224918 发布日期：2020-09-08 浏览：26次中文

阅读说明：本技术 一种透过率接近玻璃前驱体的玻璃陶瓷及其制备方法 (Glass ceramic with transmittance close to that of glass precursor and preparation method thereof ) 是由胡伟谈宝权张延起陈芳华于 2020-04-28 设计创作，主要内容包括：本发明提供了一种透过率接近玻璃前驱体的玻璃陶瓷,其以摩尔百分比计包括SiO2：60-75mol％、Al2O3：2-10mol％、P2O5：0-5mol％、ZrO2：0.5-3mol％、Na2O：0.5-6mol％、Li2O：15-28mol％,以及B2O3：0-5mol％、MgO：0-5mol％、ZnO：0-5mol％中的至少一种,以及HfO2：0-2mol％、Ta2O5：0-2mol％、Y2O3：0-2mol％中的至少一种,且满足0＜HfO2+Ta2O5+Y2O3≤2mol％,该玻璃陶瓷的可见光透过率与制备该玻璃陶瓷的玻璃前驱体的透过率相差0.3-5％。本发明降低了玻璃陶瓷的可见光透过率的调控难度,从而使得玻璃陶瓷的可见光透过率与玻璃前驱体的可见光透过率仅相差0.3-5％。(The invention provides a glass ceramic with transmittance close to that of a glass precursor, which comprises SiO in mol percentage 2 ：60‑75mol％、Al 2 O 3 ：2‑10mol％、P 2 O 5 ：0‑5mol％、ZrO 2 ：0.5‑3mol％、Na 2 O：0.5‑6mol％、Li 2 O：15‑28mol％And B 2 O 3 : 0-5 mol%, MgO: 0-5 mol%, ZnO: at least one of 0 to 5 mol%, and HfO 2 ：0‑2mol％、Ta 2 O 5 ：0‑2mol％、Y 2 O 3 : 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO 2 +Ta 2 O 5 +Y 2 O 3 Less than or equal to 2mol percent, and the difference between the visible light transmittance of the glass ceramic and the transmittance of a glass precursor for preparing the glass ceramic is 0.3 to 5 percent. The invention reduces the difficulty in regulating and controlling the visible light transmittance of the glass ceramic, so that the difference between the visible light transmittance of the glass ceramic and the visible light transmittance of the glass precursor is only 0.3-5%.)

1. A glass-ceramic having a transmittance close to that of a glass precursor, characterized in that: the components of the glass ceramic comprise SiO in mol percentage₂：60-75mol％、Al₂O₃：2-10mol％、P₂O₅：0-5mol％、ZrO₂：0.5-3mol％、Na₂O：0.5-6mol％、Li₂O: 15 to 28mol%, and B₂O₃: 0-5 mol%, MgO: 0-5 mol%, ZnO: 0 to 5 mol% of at least one;

the glass-ceramic comprises the following componentsIn mol percentage, also comprises HfO₂：0-2mol％、Ta₂O₅: 0-2 mol% and Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃≤2mol％；

The difference between the visible light transmittance of the glass ceramic and the transmittance of a glass precursor for preparing the glass ceramic is 0.3-5%.

2. The glass-ceramic having a transmittance close to that of a glass precursor according to claim 1, wherein: the visible light transmittance of the glass ceramic is 88-92%, and the mass percentage of crystals in the glass ceramic is more than or equal to 80%.

3. The glass-ceramic having a transmittance close to that of a glass precursor according to claim 1, wherein: the size range of the crystals in the glass ceramic is 10-100 nm.

4. The glass-ceramic having a transmittance close to that of a glass precursor according to claim 1, wherein: the type of the crystal in the glass ceramic is one or more of lithium disilicate, petalite and beta quartz solid solution.

5. The glass-ceramic having a transmittance close to that of a glass precursor according to claim 1, wherein: the glass-ceramic has a fracture toughness of 1.8 MPa-m or more^1/2The linear density of the tensile stress is 20000-50000MPa/mm, the maximum value CT-CV of the central tensile stress is less than or equal to 120MPa, the depth of the stress layer is more than or equal to 100 mu m, and the surface compressive stress is more than or equal to 200 MPa.

6. The glass-ceramic having a transmittance close to that of a glass precursor according to any one of claims 1 to 5, wherein: the components of the glass ceramic are calculated by mol percentage and meet the requirement of SiO₂+Li₂O≥82mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)≥8.3。

7. A preparation method of glass ceramic with transmittance close to that of a glass precursor is characterized by comprising the following steps:

preparing a glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：60-75mol％、Al₂O₃：2-10mol％、P₂O₅：0-5mol％、ZrO₂：0.5-3mol％、Na₂O：0.5-6mol％、Li₂O: 15 to 28mol%, and B₂O₃: 0-5 mol%, MgO: 0-5 mol%, ZnO: at least one of 0 to 5 mol%, and HfO₂：0-2mol％、Ta₂O₅：0-2mol％、Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃≤2mol％；

Carrying out primary heat treatment on the glass precursor of the prepared glass ceramic at the temperature of 450-550 ℃ for 1-5 hours;

second heat-treating the first heat-treated product obtained by the first heat-treatment at 550-620 ℃ for 1-5 hours;

carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at the temperature of 620-750 ℃ for 1-5 hours to prepare the glass ceramic, and adding HfO into the glass precursor for preparing the glass ceramic₂、Ta₂O₅、Y₂O₃In any case, the difference between the visible light transmittance of the glass ceramic obtained and the visible light transmittance of the glass precursor of the glass ceramic is 0.3 to 5%.

8. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 7, wherein: the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is 1-10 ℃/min.

9. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 7, wherein: the glass precursor of the glass ceramic also comprises 0.1-1 mol% of a clarifying agent in terms of mol percentage.

10. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 9, wherein: the clarifying agent is NaCl or SnO₂、NaF、Na₂SiF₆And MgF.

11. The process for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 7, wherein: the prepared glass ceramic is subjected to one-step or multi-step ion exchange in a mixed salt bath to prepare the strengthened glass ceramic.

12. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 11, wherein: the mixed salt bath comprises at least one of potassium salt, sodium salt and lithium salt, the temperature of the one-step or multi-step ion exchange is 480-600 ℃, and the total time is 2-20 hours.

13. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 12, wherein:

the method for carrying out multi-step ion exchange on the prepared glass ceramic in the mixed salt bath to prepare the strengthened glass ceramic comprises the following steps:

performing a first ion exchange on the prepared glass ceramic in a first mixed salt bath;

performing a second ion exchange on the first ion-exchange product obtained via the first ion exchange in a second mixed salt bath;

the strengthened glass ceramic is prepared.

14. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 13, wherein: the mass fraction of sodium salt in the first mixed salt bath is 30-100%, the mass fraction of potassium salt is 0-70%, the mass fraction of sodium salt in the second mixed salt bath is 0-15%, the mass fraction of lithium salt is 0-0.5%, and the mass fraction of potassium salt is 85-100%.

15. The method for producing a glass-ceramic having a transmittance close to that of a glass precursor according to claim 12, wherein:

the one-step ion exchange of the prepared glass ceramic in the mixed salt bath can prepare the strengthened glass ceramic, which comprises the following steps:

performing ion exchange on the prepared glass ceramic in a mixed salt bath of 0.5-30% of sodium salt and 70-99.5% of potassium salt by mass fraction;

the strengthened glass ceramic is prepared.

16. Use of a glass-ceramic having a transmittance approaching that of a glass precursor according to any one of claims 1 to 6 in an appliance window and/or an electronic product cover plate.

Technical Field

The invention relates to glass ceramic, in particular to glass ceramic with transmittance close to that of a glass precursor and a preparation method thereof.

Background

Glass-ceramics, also known as glass-ceramics, are a class of crystalline phase-glass-bonded composite materials made by high-temperature melting, shaping, and heat treatment. In recent years, glass ceramics have been widely used in the fields of machine manufacturing, optics, electronics, microelectronics, aerospace, chemistry, industry, biomedicine, construction, and the like, by virtue of their superior properties such as high mechanical strength, adjustable thermal expansion property, thermal shock resistance, chemical corrosion resistance, low dielectric loss, and the like.

Ordinary glass is not subjected to heat treatment, chemical strengthening and other processes, although the glass has relatively high transmittance, various characteristics of the glass, such as mechanical property, chemical stability, electrical property and the like, are not as good as glass ceramic, however, although the glass ceramic can meet the performance requirements, the transmittance of the glass ceramic is greatly different from that of a glass precursor of the glass ceramic, for example, the invention patent with the publication number of CN101693597B and the name of a transparent glass ceramic and a preparation method thereof indicates that 'because the chemical composition and the physical property of a precipitated crystal phase are greatly different from those of matrix glass, the transparent glass ceramics are commonly characterized in that the content of the crystal phase is usually lower (less than 70 percent), and the size of the crystal phase is controlled to be dozens of nanometers, otherwise, the transmittance of the glass is not ideal', therefore, the transmittance and other properties of the prepared glass ceramic are between the transmittance and other properties of the glass precursor in the preparation process, there is a large difference.

The common basic component of the existing glass ceramic is SiO₂，Al₂O₃，Na₂O，Li₂O，P₂O₅，B₂O₃Etc., a few will add some like Re₂O₃Rare components, very little HfO₂、Ta₂O₅、Y₂O₃Any one or a combination thereof. Even if HfO is added to the existing glass-ceramic₂、Ta₂O₅、Y₂O₃Either one or a combination thereof, in relatively low amounts, is only a constituent of the glass-ceramic and serves only an auxiliary role in the glass-ceramic, as disclosed in patent application publication No. CN107001120A entitled high Strength glass-ceramic having petalite and lithium silicate structures, which discloses that the glass-ceramic may contain HfO₂、Ta₂O₅However, HfO₂、Ta₂O₅Is defined as the absence of deliberate addition of the compound, molecule or element to the glass-ceramic, but the glass-ceramic may still be included and present in near indeterminate quantities or traces; also disclosed in patent application publication No. CN109661380A entitled "Pleurotus manganese pyroxene glass-ceramic" is HfO₂、Ta₂O₅But in this patent HfO₂、Ta₂O₅Referred to as "tramp material".

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the glass ceramic with the transmittance close to that of a glass precursor and the preparation method thereof are provided, and the problem that the difference between the transmittance of the existing glass ceramic and the transmittance of the glass precursor is large in the preparation process is solved.

In order to solve the technical problems, the invention adopts the technical scheme that:

in a first aspect, embodiments of the present invention provide a glass-ceramic having a transmittance approaching that of a glass precursor, the glass-ceramic having a composition comprising, in mole percent, SiO₂：60-75mol％、Al₂O₃：2-10mol％、P₂O₅：0-5mol％、ZrO₂：0.5-3mol％、Na₂O：0.5-6mol％、Li₂O: 15 to 28mol%, and B₂O₃: 0-5 mol%, MgO: 0-5 mol%, ZnO: 0 to 5 mol% of at least one;

the composition of the glass ceramic also comprises HfO in mol percentage₂：0-2mol％、Ta₂O₅: 0-2 mol% and Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃≤2mol％；

The difference between the visible light transmittance of the glass ceramic and the transmittance of a glass precursor for preparing the glass ceramic is 0.3-5%.

Further, the visible light transmittance of the glass ceramic is 88-92%, and the mass ratio of crystals in the glass ceramic is more than or equal to 80%.

Further, the size of the crystals in the glass-ceramic is in the range of 10-100 nm.

Further, the type of the crystal in the glass ceramic is one or more of lithium disilicate, petalite and beta quartz solid solution.

Further, the glass-ceramic has a fracture toughness of 1.8 MPa-m or more^1/2The linear density of the tensile stress is 20000-50000MPa/mm, the maximum value CT _ CV of the central tensile stress is less than or equal to 120MPa, the depth of the stress layer is greater than or equal to 100 mu m, and the surface compressive stress is greater than or equal to 200 MPa.

Further, the composition of the glass ceramic satisfies SiO in mol percentage₂+Li₂O≥82mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)≥8.3。

In a second aspect, the present invention provides a method for preparing a glass ceramic having a transmittance close to that of a glass precursor, including the steps of:

Carrying out primary heat treatment on the glass precursor of the prepared glass ceramic at the temperature of 450-550 ℃ for 1-5 hours;

second heat-treating the first heat-treated product obtained by the first heat-treatment at 550-620 ℃ for 1-5 hours;

Further, the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is 1-10 ℃/min.

Further, the glass precursor of the glass ceramic also comprises 0.1-1 mol% of a fining agent in terms of mole percentage.

Further, the clarifying agent is NaCl or SnO₂、NaF、Na₂SiF₆And MgF.

Further, the glass ceramic obtained is subjected to one or more ion exchanges in a mixed salt bath to obtain a strengthened glass ceramic.

Further, the mixed salt bath comprises at least one of potassium salt, sodium salt and lithium salt, the temperature of the one-step or multi-step ion exchange is 480-600 ℃, and the total time is 2-20 hours.

Further, the method for preparing the strengthened glass ceramic by carrying out multi-step ion exchange on the prepared glass ceramic in the mixed salt bath comprises the following steps:

performing a first ion exchange on the prepared glass ceramic in a first mixed salt bath;

performing a second ion exchange on the first ion-exchange product obtained via the first ion exchange in a second mixed salt bath;

the strengthened glass ceramic is prepared.

Further, the mass fraction of the sodium salt in the first mixed salt bath is 30-100%, the mass fraction of the potassium salt is 0-70%, the mass fraction of the sodium salt in the second mixed salt bath is 0-15%, the mass fraction of the lithium salt is 0-0.5%, and the mass fraction of the potassium salt is 85-100%.

Further, the prepared glass ceramic is subjected to one-step ion exchange in the mixed salt bath to prepare the strengthened glass ceramic, and the method specifically comprises the following steps:

performing ion exchange on the prepared glass ceramic in a mixed salt bath of 0.5-30% of sodium salt and 70-99.5% of potassium salt by mass fraction;

the strengthened glass ceramic is prepared.

A third aspect of embodiments of the present invention provides a use of a glass-ceramic having a transmittance close to that of a glass precursor according to the first aspect of embodiments of the present invention in an appliance window and/or an electronic product cover plate.

The invention has the beneficial effects that:

the invention provides a glass ceramic with transmittance close to that of a glass precursor, which comprises the following components in part by weight: the composition of the glass ceramic comprises HfO in mol percentage₂：0-2mol％、Ta₂O₅: 0-2 mol% and Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃Less than or equal to 2mol percent, and has the functions of: firstly, the crystal nuclei in the glass ceramic are uniformly distributed in the glass ceramic, and secondly, the crystal nuclei in the crystal are uniformly distributed in the glass ceramicAfter the growth, the size and the dimension of the crystal can be kept consistent, and the densification of the glass ceramic is further realized, so that the glass ceramic can obviously promote the growth of crystal nuclei, and the regulation and control difficulty of the visible light transmittance of the glass ceramic is further reduced, so that the visible light transmittance of the glass ceramic is closer to that of a glass precursor, and only the difference is 0.3-5%. In a second aspect: HfO₂、Ta₂O₅And Y₂O₃The total amount of the additive is less than or equal to 2mol percent, greatly reduces the melting difficulty of the glass ceramic, and is beneficial to the production and the manufacture of the glass ceramic. In a third aspect: the glass ceramic can be applied to an electrical appliance window and/or an electronic product cover plate, and the overall performance of the electrical appliance window and/or the electronic product cover plate is improved. In a fourth aspect: addition of HfO₂、Ta₂O₅And Y₂O₃At least one of the components is beneficial to realizing integral crystallization of the glass ceramic, and can also provide higher elastic modulus, hardness and strength for the glass ceramic. In a fifth aspect: addition of B₂O₃At least one of MgO and ZnO can effectively control the hardening speed and the crystallization performance of the glass precursor, improve the melting performance of the glass ceramic and play a role in fluxing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a scanning electron microscope image of a glass-ceramic having a transmittance close to that of a glass precursor according to a first embodiment of the present invention, when the crystal size of the glass-ceramic is 80 to 90 nm;

FIG. 2 is a scanning electron microscope image of a glass-ceramic having a transmittance close to that of a glass precursor according to a second embodiment of the present invention, when the crystal size of the glass-ceramic is 40 to 50 nm.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a scanning electron microscope image of a glass ceramic having a transmittance close to that of a glass precursor according to a first embodiment of the present invention, when the crystal size of the glass ceramic is 80-90 nm.

The first embodiment of the present invention provides a glass-ceramic having a transmittance close to that of a glass precursor, which comprises, in mol%, SiO₂：68mol％、Al₂O₂：3.5mol％、P₂O₅：2mol％、ZrO₂：3mol％、Na₂O：6mol％、Li₂O：15.4mol％、B₂O₃: 0.5 mol% and ZnO: 1mo 1%;

the composition of the glass ceramic comprises Ta₂O₅：0.2mol％；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝83.4mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝8.78；

The visible light transmittance of the glass ceramic is 88.9 percent, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92.1 percent, and the difference between the visible light transmittance and the visible light transmittance is 3.2 percent.

Wherein the types of the crystals in the glass ceramic are beta quartz solid solution and lithium disilicate, the mass percentage of the crystals is 95%, the size range of the crystals is 80-90nm, and the scanning electron microscope image of the glass ceramic is shown in figure 1.

It is to be understood that the mass of crystals in the glass-ceramic means the mass of crystals as a percentage of the total mass of the glass-ceramic.

Wherein the glass-ceramic has a fracture toughness of 1.91 MPa-m^1/2The linear density of the tensile stress is 25000MPa/mm, the maximum value CT _ CV of the central tensile stress is 85MPa, the depth of the stress layer is 100 mu m, and the surface compressive stress is 500 MPa.

In the present embodiment, the glass ceramic is used as an appliance window. In other embodiments, the glass-ceramic may be applied to a cover plate of an electronic product or any other product capable of using a glass-ceramic.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：68mol％、Al₂O₃：3.5mol％、P₂O₅：2mol％、ZrO₂：3mol％、Na₂O：6mol％、Li₂O：15.4mol％、B₂O₃: 0.5 mol%, ZnO: 1 mol% and Ta₂O₅：0.2mol％：

S2, carrying out first heat treatment on the prepared glass precursor of the glass ceramic at 490 ℃ for 3.5 hours;

s3, second heat-treating the first heat-treated product obtained through the first heat treatment at 600 ℃ for 4 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 730 ℃ for 3.5 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 3.2 percent.

In this example, the glass ceramic obtained was ion-exchanged in a mixed salt bath of 0.5 mass% of a sodium salt and 99.5 mass% of a potassium salt at 580 ℃ for 2 hours to obtain a strengthened glass ceramic.

Wherein the glass precursor of the reinforced glass ceramic also comprises 0.4mol percent of fining agent in terms of mole percentage, and the fining agent is NaF and SnO₂。

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 1 ℃/min.

It should be noted that in this example, the sodium salt is NaNO₃The potassium salt is KNO₃. In other embodiments, the sodium salt is not limited toNaNO₃Potassium salt is not limited to KNO₃I.e. the sodium or potassium salt may be other commonly used or unusual salts.

The first embodiment of the invention provides a glass ceramic with transmittance close to that of a glass precursor and a preparation method thereof, and clarifying agents NaF and SnO are added₂And is beneficial to the rapid discharge of bubbles in the melting process of the glass precursor.

Referring to fig. 2, fig. 2 is a scanning electron microscope image of a glass ceramic having a transmittance close to that of a glass precursor according to a second embodiment of the present invention, when the crystal size of the glass ceramic is 40 to 50 nm.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the second embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：61mol％、Al₂O₃：3.5mol％、P₂O₅：1.4mol％、ZrO₂：0.8mol％、Na₂O：2.5mol％、Li₂O: 23.5 mol% and B₂O₃：5mol％：

The glass ceramic also comprises HfO in molar percentage₂：2mol%；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝84.5mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝14.08；

The visible light transmittance of the glass ceramic is 91.5 percent, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92.4 percent, and the difference between the visible light transmittance and the visible light transmittance is 0.9 percent.

Wherein the type of the crystals in the glass ceramic is lithium disilicate, the mass percentage of the crystals is 87%, and the size range of the crystals is 40-50nm, and the scanning electron microscope image of the glass ceramic is shown in FIG. 2.

Wherein the glass-ceramic has a fracture toughness of 1.98 MPa-m^1/2The linear density of tensile stress is 45000MPa/mm, the maximum value CT _ CV of central tensile stress is 105MPa, the depth of a stress layer is 140 mu m, and the surfaceThe compressive stress was 420 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：61mol％、Al₂O₃：3.5mol％、P₂O₅：1.4mol％、ZrO₂：0.8mol％、Na₂O：2.5mol％、Li₂O：23.5mol％、B₂O₂: 5 mol% and HfO₂：2mol％；

S2, carrying out primary heat treatment on the prepared glass precursor of the glass ceramic at 510 ℃ for 2.5 hours;

s3, second heat-treating the first heat-treated product obtained via the first heat-treatment at 610 ℃ for 3.5 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 650 ℃ for 5 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 0.9 percent.

In this example, the glass ceramic obtained was subjected to a first ion exchange at 500 ℃ for 4 hours in a mixed salt bath of 60 mass% of a sodium salt and 40 mass% of a potassium salt, and then to a second ion exchange at 600 ℃ for 2 hours in a salt bath of 100 mass% of a potassium salt, thereby obtaining a strengthened glass ceramic.

Wherein the glass precursor of the reinforced glass ceramic also comprises 0.3mol percent of refining agent in terms of mol percentage, and the refining agent is SnO₂。

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 10 ℃/min.

In the second embodiment of the present invention, the glass-ceramic having a transmittance close to that of the glass precursor is provided with a fining agent SnO₂Is beneficial to the glass precursor to be melted quicklyQuickly discharging air bubbles.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the third embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：60mol％、Al₂O₃：10mol％、ZrO₂：1mol％、Na₂O：0.5mol％、Li₂O: 28mol% and MgO: 0.2 mol%;

the glass ceramic also comprises HfO in molar percentage₂：0.2mol％；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝88mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝8.38；

The visible light transmittance of the glass ceramic is 88 percent, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92.6 percent, and the difference between the visible light transmittance and the visible light transmittance is 4.6 percent.

Wherein the types of the crystals in the glass ceramic are beta quartz solid solution and petalite, the mass percentage of the crystals is 92%, and the size range of the crystals is 90-100 nm.

Wherein the glass-ceramic has a fracture toughness of 1.95 MPa-m^1/2The linear density of the tensile stress is 50000MPa/mm, the maximum value CT _ CV of the central tensile stress is 110MPa, the depth of a stress layer is 120 mu m, and the surface compressive stress is 450 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：60mol％、Al₂O₃：10mol％、ZrO₂：1mol％、Na₂O：0.5mol％、Li₂O: 28mol%, MgO: 0.2mol% and HfO₂：0.2mol％；

S2, carrying out primary heat treatment on the prepared glass precursor of the glass ceramic for 1 hour at 550 ℃;

s3, heat-treating the first heat-treated product obtained by the first heat treatment at 620 ℃ for a second time for 2 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 750 ℃ for 4 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 4.6 percent.

In this example, the glass ceramic obtained was ion-exchanged in a mixed salt bath of 10 mass% of a sodium salt and 90 mass% of a potassium salt at 600 ℃ for 4 hours to obtain a strengthened glass ceramic.

Wherein the glass precursor of the reinforced glass ceramic also comprises 0.1mol percent of refining agent in terms of mol percentage, and the refining agent is SnO₂。

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 2 ℃/min.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the fourth embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：75mol％、Al₂O₃：2mol％、P₂O₅：1mol％、ZrO₂：1.5mol％、Na₂O：1mol％、Li₂O：15mol％、B₂O₃: 1 mol%, MgO: 1.8 mol% and ZnO: 0.5 mol%;

the glass ceramic also comprises Y in mol percentage₂O₃：1mol％；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝90mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝30；

The visible light transmittance of the glass ceramic is 91%, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92.2%, and the difference between the visible light transmittance and the visible light transmittance is 1.2%.

Wherein the type of the crystal in the glass ceramic is lithium disilicate, the mass percentage of the crystal is 90 percent, and the size range of the crystal is 50-60 nm.

Wherein the glass-ceramic has a fracture toughness of 2.05 MPa-m^1/2The linear density of the tensile stress is 38000MPa/mm, the maximum value CT _ CV of the central tensile stress is 105MPa, the depth of a stress layer is 145 mu m, and the surface compressive stress is 300 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：75mol％、Al₂O₃：2mol％、P₂O₅：1mol％、ZrO₂：1.5mol％、Na₂O：1mol％、Li₂O：15mol％、B₂O₃: 1 mol%, MgO: 1.8 mol%, ZnO: 0.5 mol% and Y₂O₃：1mol％；

S2, carrying out first heat treatment on the prepared glass precursor of the glass ceramic for 5 hours at 470 ℃;

s3, heat-treating the first heat-treated product obtained by the first heat treatment at 550 ℃ for a second time for 1 hour;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at the temperature of 620 ℃ for 3 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 1.2 percent.

In this example, the glass ceramic obtained was subjected to a first ion exchange at 550 ℃ for 3 hours in a salt bath containing 100% by mass of a sodium salt, and then to a second ion exchange at 550 ℃ for 2 hours in a mixed salt bath containing 15% by mass of a sodium salt and 85% by mass of a potassium salt, to obtain a strengthened glass ceramic.

Wherein, the glass precursor of the strengthened glass ceramic is calculated by mol percent0.2mol% of clarifying agent is also included, and the clarifying agent is Na₂SiF₆。

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 5 ℃/min.

In the glass ceramic having a transmittance close to that of the glass precursor according to the fourth embodiment of the present invention, Na as a fining agent is added₂SiF₆And is beneficial to the rapid discharge of bubbles in the melting process of the glass precursor.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the fifth embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：64mol％、Al₂O₃：5mol％、P₂O₅：5mol％、ZrO₂：0.5mol％、Na₂O：2mol％、Li₂O: 20 mol% and MgO: 1 mol%:

the glass ceramic also comprises HfO in molar percentage₂: 1 mol% and Ta₂O₅：1mol%；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝84mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝12；

The visible light transmittance of the glass ceramic is 91.6 percent, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92 percent, and the difference between the visible light transmittance and the visible light transmittance is 0.4 percent.

Wherein the types of the crystals in the glass ceramic are lithium disilicate and petalite, the mass percentage of the crystals is 85%, and the size range of the crystals is 40-50 nm.

Wherein the glass-ceramic has a fracture toughness of 2MPa m^1/2The linear density of tensile stress is 30000MPa/mm, the maximum value CT _ CV of central tensile stress is 90MPa, the depth of a stress layer is 130 mu m, and the surface compressive stress is 280 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：64mol％、Al₂O₃：5mol％、P₂O₅：5mol％、ZrO₂：0.5mol％、Na₂O：2mol％、Li₂O：20mol％、MgO：1mol％、HfO₂: 1 mol% and Ta₂O₅：1mol％；

S2, carrying out primary heat treatment on the prepared glass precursor of the glass ceramic for 4.5 hours at 480 ℃;

s3, heat-treating the first heat-treated product obtained through the first heat treatment at 570 ℃ for a second time for 2 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 640 ℃ for 4 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 0.4 percent.

In this example, the glass ceramic obtained was first ion-exchanged at 520 ℃ for 4 hours in a mixed salt bath of 98% by mass of a sodium salt and 2% by mass of a potassium salt, and then, was ion-exchanged at 500 ℃ for 4 hours in a mixed salt bath of 5% by mass of a sodium salt, 94.8% by mass of a potassium salt and 0.2% by mass of a lithium salt, thereby obtaining a strengthened glass ceramic.

The glass precursor of the strengthened glass ceramic also comprises 0.5 mol% of a clarifying agent in terms of mole percentage, and the clarifying agent is NaF.

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 8 ℃/min.

In this embodiment, the lithium salt is LiNO₃. In other embodiments, the lithium salt is not limited to LiNO₃I.e. the lithium salt may be other commonly used or unusual salts.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the sixth embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：62mol％、Al₂O₃：6mol％、P₂O₅：1.5mol％、ZrO₂：1.7mol％、Na₂O：0.5mol％、Li₂O: 22 mol% and MgO: 4.5 mol%;

the glass ceramic also comprises HfO in molar percentage₂: 0.5 mol% and Ta₂O₅：0.5mol％；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝84mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝12.92；

The visible light transmittance of the glass ceramic is 92%, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92.3%, and the difference between the visible light transmittance and the visible light transmittance is 0.3%.

Wherein the types of the crystals in the glass ceramic are lithium disilicate and petalite, the mass percentage of the crystals is 80%, and the size range of the crystals is 20-30 nm.

Wherein the glass-ceramic has a fracture toughness of 2.15 MPa-m^1/2The linear density of tensile stress is 48000MPa/mm, the maximum value of central tensile stress CT _ CV is 120MPa, the depth of stress layer is 150 μm, and the surface compressive stress is 260 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：62mol％、Al₂O₃：6mol％、P₂O₅：1.5mol％、ZrO₂：1.7mol％、Na₂O：0.5mol％、Li₂O：22mol％、MgO：4.5mol％、HfO₂: 0.5 mol% and Ta₂O₅：0.5mol％；

S2, carrying out first heat treatment on the prepared glass precursor of the glass ceramic for 3 hours at 520 ℃;

s3, second heat-treating the first heat-treated product obtained through the first heat-treatment at 600 ℃ for 5 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 680 ℃ for 2 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 0.3 percent.

In this example, the glass ceramic obtained was first ion-exchanged at 560 ℃ for 5 hours in a mixed salt bath of 90% by mass of a sodium salt and 10% by mass of a potassium salt, and then, was ion-exchanged at 480 ℃ for 15 hours in a mixed salt bath of 1.5% by mass of a sodium salt, 98% by mass of a potassium salt and 0.5% by mass of a lithium salt, whereby a strengthened glass ceramic was obtained.

Wherein the glass precursor of the reinforced glass ceramic also comprises 0.8mol percent of fining agent in terms of mol percent, and the fining agent is NaCl and SnO₂。

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 7 ℃/min.

In the glass ceramic having a transmittance close to that of the glass precursor provided in the sixth embodiment of the present invention, the fining agents NaCl and SnO are added₂And is beneficial to the rapid discharge of bubbles in the melting process of the glass precursor.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the seventh embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：66mol％、Al₂O₃：4mol％、P₂O₅：1.2mol％、ZrO₂：2mol％、Na₂O：1.5mol％、Li₂O：16mol％、B₂O₃: 2mol% and ZnO: 5mol percent;

the composition of the glass ceramic comprises Ta₂O₅：2mol％；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝82mol%，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝14.9；

The visible light transmittance of the glass ceramic is 90.9%, the visible light transmittance of the glass precursor for preparing the glass ceramic is 92.1%, and the difference between the visible light transmittance and the visible light transmittance is 1.2%.

Wherein the types of the crystals in the glass ceramic are lithium disilicate and petalite, the mass percentage of the crystals is 88%, and the size range of the crystals is 50-60 nm.

Wherein the glass-ceramic has a fracture toughness of 2.02 MPa-m^1/2The linear density of the tensile stress is 20000MPa/mm, the maximum value CT _ CV of the central tensile stress is 80MPa, the depth of a stress layer is 110 mu m, and the surface compressive stress is 200 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：66mol％、Al₂O₃：4mol％、P₂O₅：1.2mol％、ZrO₂：2mol％、Na₂O：1.5mol％、Li₂O：16mol％、B₂O₃: 2mol%, ZnO: 5 mol% and Ta₂O₅：2mol％；

S2, carrying out primary heat treatment on the prepared glass precursor of the glass ceramic at 530 ℃ for 2 hours;

s3, second heat-treating the first heat-treated product obtained through the first heat-treatment at 610 ℃ for 3 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 700 ℃ for 5 hours to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 1.2 percent.

In this example, the glass ceramic obtained was ion-exchanged at 490 ℃ for 6 hours in a mixed salt bath of 30 mass% sodium salt and 70 mass% potassium salt to obtain a strengthened glass ceramic.

The glass precursor of the strengthened glass ceramic also comprises 0.3 mol% of a clarifying agent in terms of mole percentage, and the clarifying agent is MgF.

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 4 ℃/min.

The glass ceramic with the transmittance close to that of the glass precursor provided by the seventh embodiment of the invention is added with the clarifying agent MgF, which is beneficial to quickly discharging bubbles in the melting process of the glass precursor.

Unlike the glass ceramic having a transmittance close to that of the glass precursor provided in the first embodiment of the present invention, in the eighth embodiment of the present invention:

the components of the glass ceramic comprise SiO in mol percentage₂：65mol％、Al₂O₃：4.5mol％、ZrO₂：0.5mol％、Na₂O：1.5mol％、Li₂O：17.5mol％、B₂O₃: 3 mol% and MgO: 5mol percent;

the glass ceramic also comprises Y in mol percentage₂O₃：2mol％；

The glass ceramic comprises the components of SiO in mol percentage₂+Li₂O＝82.5mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)＝13.75；

The visible light transmittance of the glass ceramic is 89.9 percent, the visible light transmittance of the glass precursor for preparing the glass ceramic is 91.9 percent, and the difference between the visible light transmittance and the visible light transmittance is 2 percent.

Wherein the types of the crystals in the glass ceramic are lithium disilicate and petalite, the mass percentage of the crystals is 90%, and the size range of the crystals is 70-80 nm.

Wherein the glass ceramic has a fracture toughness of 2.11 MPa-m^1/2The linear density of tensile stress is 35000MPa/mm, the maximum value CT _ CV of central tensile stress is 95MPa, and the stress layerThe depth was 115 μm and the surface compressive stress was 320 MPa.

In addition, the embodiment also provides a preparation method of the glass ceramic with the transmittance close to that of the glass precursor, and the method comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：65mol％、Al₂O₃：4.5mol％、ZrO₂：0.5mol％、Na₂O：1.5mol％、Li₂O：17.5mol％、B₂O₃: 3 mol%, MgO: 5 mol% and Y₂O₃：2mol％；

S2, carrying out primary heat treatment on the prepared glass precursor of the glass ceramic for 4 hours at 500 ℃;

s3, heat-treating the first heat-treated product obtained by the first heat treatment at 590 ℃ for a second time for 2.5 hours;

and S4, carrying out third heat treatment on the second heat treatment product obtained by the second heat treatment at 710 ℃ for 1 hour to obtain the glass ceramic, wherein the visible light transmittance of the prepared glass ceramic is different from that of the glass precursor of the glass ceramic by 2 percent.

In this example, the glass ceramic obtained was subjected to a first ion exchange at 480 ℃ for 3 hours in a mixed salt bath of 30% by mass of a sodium salt and 70% by mass of a potassium salt, and then to a second ion exchange at 580 ℃ for 1 hour in a mixed salt bath of 8% by mass of a sodium salt and 92% by mass of a potassium salt, whereby a strengthened glass ceramic was obtained.

The glass precursor of the strengthened glass ceramic also comprises 1 mol% of a clarifying agent in terms of mole percentage, and the clarifying agent is NaCl.

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept at 9 ℃/min.

In order to clearly understand the present invention by combining the first embodiment to the eighth embodiment of the present invention, please refer to table one below.

The contents of table one are described below:

SiO in Table I₂、Al₂O₃、P₂O₅、ZrO₂、Na₂O、Li₂O、B₂O₃、MgO、ZnO、HfO₂、Ta₂O₅、Y₂O₃And the content of the clarifying agent is calculated by mol percent; the temperature is measured in DEG C; time is measured in hours; the transmittance, the crystal mass ratio, the sodium salt content, the potassium salt content and the lithium salt content are all calculated in percentage; fracture toughness in MPa m^1/2Counting; the tensile stress linear density is measured in MPa/mm; the maximum value CT _ CV of the central tensile stress and the surface compressive stress are measured in MPa; the depth of the stress layer is measured by mum; the crystal size is in nm.

As can be seen from the combination of the first table, the composition of the glass-ceramic having transmittance close to that of the glass precursor provided by the embodiment of the present invention comprises SiO in mol percentage₂：60-75mol％、Al₂O₃：2-10mol％、P₂O₅：0-5mol％、ZrO₂：0.5-3mol％、Na₂O：0.5-6mol％、Li₂O: 15 to 28mol%, and B₂O₃: 0-5 mol%, MgO: 0-5 mol%, ZnO: 0 to 5 mol% of at least one;

the glass ceramicThe composition of (A) further comprises HfO in mol percentage₂：0-2mol％、Ta₂O₅: 0-2 mol% and Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃≤2mol％；

The components of the glass ceramic are calculated by mol percentage and meet the requirement of SiO₂+Li₂O≥82mol％，(SiO₂+Li₂O)/(Al₂O₃+Na₂O)≥8.3；

The difference between the visible light transmittance of the glass ceramic and the transmittance of a glass precursor for preparing the glass ceramic is 0.3-5%.

The glass ceramic has a visible light transmittance of 88-92%, the mass percentage of crystals in the glass ceramic is greater than or equal to 80%, the size range of the crystals in the glass ceramic is 10-100nm, the types of the crystals in the glass ceramic are one or more of lithium disilicate, petalite and β quartz solid solution, and the fracture toughness of the glass ceramic is greater than or equal to 1.8 MPa.m^1/2The linear density of the tensile stress is 20000-50000MPa/mm, the maximum value CT _ CV of the central tensile stress is less than or equal to 120MPa, the depth of the stress layer is greater than or equal to 100 mu m, and the surface compressive stress is greater than or equal to 200 MPa.

In addition, the preparation method of the glass ceramic with the transmittance close to that of the glass precursor provided by the embodiment of the invention comprises the following steps:

s1, preparing the glass precursor of the glass ceramic, wherein the glass precursor of the glass ceramic comprises SiO in mol percentage₂：60-75mol％、Al₂O₃：2-10mol％、P₂O₅：0-5mol％、ZrO₂：0.5-3mol％、Na₂O：0.5-6mol％、Li₂O: 15 to 28mol% and satisfies SiO₂+Li₂O is more than or equal to 82mol percent and (SiO)₂+Li₂O)/(Al₂O₃+Na₂O) is not less than 8.3, and B₂O₃: 0-5 mol%, MgO: 0-5 mol%, ZnO: at least one of 0 to 5 mol%, and HfO₂：0-2mol％、Ta₂O₅：0-2mol％、Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃≤2mol％；

S2, carrying out primary heat treatment on the glass precursor of the prepared glass ceramic at the temperature of 450-550 ℃ for 1-5 hours;

s3, carrying out secondary heat treatment on the first heat treatment product obtained by the primary heat treatment at 550-620 ℃ for 1-5 hours;

s4, carrying out a third heat treatment on the second heat treatment product obtained by the second heat treatment at the temperature of 620-750 ℃ for 1-5 hours to obtain the glass ceramic, and adding HfO into the glass precursor for preparing the glass ceramic₂、Ta₂O₅、Y₂O₃In any case, the difference between the visible light transmittance of the glass ceramic and the visible light transmittance of the glass precursor of the glass ceramic is 0.3 to 5%.

Wherein the heating rate among the first heat treatment, the second heat treatment and the third heat treatment is kept between 1 and 10 ℃/min.

Wherein the glass precursor of the glass ceramic also comprises 0.1-1 mol% of a refining agent in terms of mol percentage, and the type of the refining agent is NaCl or SnO₂、NaF、Na₂SiF₆And MgF.

In addition, the glass ceramic obtained is subjected to one-step or multi-step ion exchange in a mixed salt bath to obtain a strengthened glass ceramic.

Wherein, when the prepared glass ceramic is subjected to one-step ion exchange in the mixed salt bath, the prepared glass ceramic is subjected to ion exchange for 2 to 20 hours at 480 ℃ and 600 ℃ in the mixed salt bath of 0.5 to 30 mass percent of sodium salt and 70 to 99.5 mass percent of potassium salt.

When the prepared glass ceramic is subjected to multi-step ion exchange in a mixed salt bath, the prepared glass ceramic is firstly subjected to primary ion exchange at 480-600 ℃ in the mixed salt bath containing 30-100% of sodium salt and 0-70% of potassium salt in mass fraction, and then subjected to secondary ion exchange at 480-600 ℃ in the mixed salt bath containing 0-15% of sodium salt, 0-0.5% of lithium salt and 85-100% of potassium salt in mass fraction, wherein the total time of the two ion exchanges is 2-20 hours.

In summary, the glass ceramic with transmittance close to that of the glass precursor and the preparation method thereof provided by the invention have the beneficial effects that:

in a first aspect: the composition of the glass ceramic comprises HfO in mol percentage₂：0-2mol％、Ta₂O₅: 0-2 mol% and Y₂O₃: 0 to 2mol% of at least one of the above-mentioned compounds, and satisfies 0 < HfO₂+Ta₂O₅+Y₂O₃Less than or equal to 2mol percent, and has the functions of: firstly, crystal nuclei in the glass ceramic are uniformly distributed in the glass ceramic, and secondly, after the crystals grow, the sizes and the sizes of the crystals can be kept consistent, so that the densification of the glass ceramic is realized, the glass ceramic can obviously promote the growth of the crystal nuclei, and the regulation and control difficulty of the visible light transmittance of the glass ceramic is further reduced, so that the visible light transmittance of the glass ceramic is closer to that of a glass precursor, and only the difference is 0.3-5%. In a second aspect: HfO₂、Ta₂O₅And Y₂O₃The total amount of the additive is less than or equal to 2mol percent, greatly reduces the melting difficulty of the glass ceramic, and is beneficial to the production and the manufacture of the glass ceramic. In a third aspect: the glass ceramic can be applied to an electrical appliance window and/or an electronic product cover plate, and the overall performance of the electrical appliance window and/or the electronic product cover plate is improved. In a fourth aspect: addition of HfO₂、Ta₂O₅And Y₂O₃At least one of the components is beneficial to realizing integral crystallization of the glass ceramic, and can also provide higher elastic modulus, hardness and strength for the glass ceramic. In a fifth aspect: addition of B₂O₃At least one of MgO and ZnO can effectively control the hardening speed and the crystallization performance of the glass precursor, improve the melting performance of the glass ceramic and play a role in fluxing. A sixth aspect: NaCl and SnO are added₂、NaF、Na₂SiF₆At least one refining agent of MgF, which is beneficial to glass frontThe body rapidly discharges bubbles during the melting process.

In the context of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined in this disclosure may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

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Glass ceramic with transmittance close to that of glass precursor and preparation method thereof

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