阅读说明：本技术 微波介质陶瓷材料及其制备方法和应用 (Microwave dielectric ceramic material and preparation method and application thereof ) 是由 李礼 于 2021-09-02 设计创作，主要内容包括：本发明提供了一种微波介质陶瓷材料及其制备方法和应用,涉及材料技术领域。本发明提供的微波介质陶瓷材料,以特定配比的BaTi-(4)O-(9)和BaZn-(2.03)Ti-(3.89)O-(10.89)为晶相,二者复合能够使得微波介质陶瓷材料的介电常数在36附近,谐振频率温度系数接近于零,通过在上述体系中引入BN、AlN能够大幅度提高材料的抗热震性能,引入由特定组分组成的第一改性剂和第三改性剂,能够降低微波介质陶瓷的烧结温度,提高微波介质陶瓷的介电性能。相较于传统的BaTi-(4)O-(9)基微波介质陶瓷材料,本发明的微波介质陶瓷材料的烧结温度降低了约30℃,品质因数较高,热震温差为155～160℃,抗热震性好。(The invention provides a microwave dielectric ceramic material and a preparation method and application thereof, and relates to the technical field of materials. The microwave dielectric ceramic material provided by the invention is BaTi with a specific proportion 4 O 9 And BaZn 2.03 Ti 3.89 O 10.89 The microwave dielectric ceramic material is a crystalline phase, the dielectric constant of the microwave dielectric ceramic material is close to 36 due to the combination of the crystalline phase and the crystalline phase, the temperature coefficient of the resonant frequency is close to zero, the thermal shock resistance of the material can be greatly improved by introducing BN and AlN into the system, and the sintering temperature of the microwave dielectric ceramic can be reduced and the dielectric property of the microwave dielectric ceramic can be improved by introducing a first modifier and a third modifier which are composed of specific components. Compared with the conventional BaTi 4 O 9 The sintering temperature of the microwave dielectric ceramic material is reducedThe temperature is about 30 ℃, the quality factor is higher, the thermal shock temperature difference is 155-160 ℃, and the thermal shock resistance is good.)

1. A microwave dielectric ceramic material is characterized by being mainly prepared from a ceramic main material and a modifier;

the ceramic main material comprises BaTi according to the mol percentage₄O₉70 to 80 percent and BaZn_2.03Ti_3.89O_10.89 20％～30％；

The modifying agent comprises at least one of a first modifying agent, a second modifying agent, or a third modifying agent;

the first modifier comprises Al₂O₃、SiO₂Or CuO;

the second modifier comprises BN and/or AlN;

the third modifier comprises MnCO₃、Nd₂O₃Or CeO₂At least one of (1).

2. A microwave dielectric ceramic material according to claim 1 wherein the BaTi₄O₉The preparation method comprises the following steps:

mixing BaO and TiO₂According to BaTi₄O₉Crushing and mixing the materials according to the stoichiometric ratio, and presintering the mixture to prepare the BaTi₄O₉；

Preferably, the pre-sintering temperature is 1000-1050 ℃, and the pre-sintering time is 3-4 h.

3. The method of claim 1The microwave dielectric ceramic material is characterized in that the BaZn_2.03Ti_3.89O_10.89The preparation method comprises the following steps:

mixing BaO, ZnO and TiO₂In accordance with BaZn_2.03Ti_3.89O_10.89Crushing and mixing the materials according to the stoichiometric ratio, and presintering the mixture to prepare the BaZn_2.03Ti_3.89O_10.89；

Preferably, the pre-sintering temperature is 1000-1050 ℃, and the pre-sintering time is 3-4 h.

4. The microwave dielectric ceramic material as claimed in claim 1, wherein the modifier is 4-7% of the mass of the ceramic main material.

5. The microwave dielectric ceramic material as claimed in claim 4, wherein the first modifier is 3.5-5% of the mass of the ceramic main material, preferably 3.5-4.5%; the second modifier accounts for 0.3-1% of the mass of the ceramic main material; the third modifier accounts for 0.2-1% of the mass of the ceramic main material, and preferably accounts for 0.2-0.5%.

6. A process for preparing a microwave dielectric ceramic material as claimed in any one of claims 1 to 5, comprising the steps of:

crushing and mixing the ceramic main material, the modifier and the binder to obtain mixed slurry;

granulating the mixed slurry to obtain granulated powder;

and (3) dry-pressing the granulation powder into a green body, and sintering to obtain the microwave dielectric ceramic material.

7. A method for preparing microwave dielectric ceramic material according to claim 6, wherein the binder comprises polyvinyl alcohol and/or polyacrylic acid;

preferably, the means of comminution comprises ball milling and/or sand milling.

8. A preparation method of a microwave dielectric ceramic material as claimed in claim 6, wherein the average particle size of the granulated powder is 50 μm to 150 μm.

9. The preparation method of microwave dielectric ceramic material as claimed in claim 6, wherein the green body has a dry-pressed density of 2.4-2.7 g/cm³；

Preferably, the sintering temperature is 1080-1150 ℃; the sintering time is 3-4 h.

10. Use of the microwave dielectric ceramic material according to any one of claims 1 to 5 or the microwave dielectric ceramic material prepared by the preparation method according to any one of claims 6 to 9 in radio frequency components.

Technical Field

The invention relates to the technical field of materials, in particular to a microwave dielectric ceramic material and a preparation method and application thereof.

Background

Based on the rapid popularization of 5G networks, radio frequency components such as resonators, filters, oscillators, phase shifters, capacitors, microwave substrates and the like become key materials for communication, wherein the microwave dielectric ceramic material is a key ceramic material which is applied to microwave frequency band circuits in the radio frequency components and used as a dielectric material to complete one or more functions.

Since the development of microwave dielectric ceramics in 1939 to the present, various low, medium and high dielectric microwave dielectric ceramics have rapidly developed and diversified, and related systems are gradually mature and improved, and have dielectric constant epsilon_rAbout 36 microwave dielectric ceramics, mainly BaTi in the current market₄O₉Based on microwave dielectric ceramics, but under the condition of large temperature difference, internal stress is generated due to uneven heat dissipation, so that the thermal shock resistance of the product is poor, and in the prior art, BaTi is used as the material of the ceramic material₄O₉The microwave dielectric ceramic material has poor thermal shock resistance and cannot meet the requirements of 5G mobile communication application.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the present invention is to provide a microwave dielectric ceramic material with good shock resistance, so as to solve at least one of the above problems.

The second purpose of the invention is to provide a preparation method of the microwave dielectric ceramic material, which is simple and convenient to operate, rapid and low in cost.

The third purpose of the invention is to provide the application of the microwave dielectric ceramic material in radio frequency components.

In a first aspect, the invention provides a microwave dielectric ceramic material, which is mainly prepared from a ceramic main material and a modifier;

the ceramic main material comprises BaTi according to the mol percentage₄O₉70 to 80 percent and BaZn_2.03Ti_3.89O_10.8920％～30％；

The modifying agent comprises at least one of a first modifying agent, a second modifying agent, or a third modifying agent;

the first modifier comprises Al₂O₃、SiO₂Or CuO;

the second modifier comprises BN and/or AlN;

the third modifier comprises MnCO₃、Nd₂O₃Or CeO₂At least one of (1).

As a further technical proposal, the BaTi₄O₉The preparation method comprises the following steps:

mixing BaO and TiO₂According to BaTi₄O₉Crushing and mixing the materials according to the stoichiometric ratio, and presintering the mixture to prepare the BaTi₄O₉；

Preferably, the pre-sintering temperature is 1000-1050 ℃, and the pre-sintering time is 3-4 h.

As a further technical scheme, the BaZn_2.03Ti_3.89O_10.89The preparation method comprises the following steps:

mixing BaO, ZnO and TiO₂In accordance with BaZn_2.03Ti_3.89O_10.89Crushing and mixing the materials according to the stoichiometric ratio, and presintering the mixture to prepare the BaZn_2.03Ti_3.89O_10.89；

Preferably, the pre-sintering temperature is 1000-1050 ℃, and the pre-sintering time is 3-4 h.

As a further technical scheme, the modifier accounts for 4-7% of the mass of the ceramic main material.

As a further technical scheme, the first modifier accounts for 3.5-5% of the mass of the ceramic main material, and preferably accounts for 3.5-4.5%; the second modifier accounts for 0.3-1% of the mass of the ceramic main material; the third modifier accounts for 0.2-1% of the mass of the ceramic main material, and preferably accounts for 0.2-0.5%.

In a second aspect, the invention provides a preparation method of a microwave dielectric ceramic material, which comprises the following steps:

crushing and mixing the ceramic main material, the modifier and the binder to obtain mixed slurry;

granulating the mixed slurry to obtain granulated powder;

and (3) dry-pressing the granulation powder into a green body, and sintering to obtain the microwave dielectric ceramic material.

As a further technical solution, the binder comprises polyvinyl alcohol and/or polyacrylic acid;

preferably, the means of comminution comprises ball milling and/or sand milling.

As a further technical proposal, the average grain diameter of the granulated powder is 50 to 150 μm.

As a further technical scheme, the dry pressing density of the blank is 2.4-2.7 g/cm³；

Preferably, the sintering temperature is 1080-1150 ℃; the sintering time is 3-4 h.

In a third aspect, the invention provides an application of a microwave dielectric ceramic material in a radio frequency component.

Compared with the prior art, the invention has the following beneficial effects:

the microwave dielectric ceramic material provided by the invention is BaTi with a specific proportion₄O₉And BaZn_2.03Ti_3.89O_10.89The microwave dielectric ceramic material is in a crystal phase, the composition of the microwave dielectric ceramic material and the crystal phase can enable the dielectric constant of the microwave dielectric ceramic material to be around 36, the temperature coefficient of the resonant frequency to be close to zero, and the microwave dielectric ceramic material is prepared by adding BaTi₄O₉-BaZn_2.03Ti_3.89O_10.89BN and AlN are introduced into the system, so that the thermal shock resistance of the material can be greatly improved, and the first modifier and the third modifier which are composed of specific components are introduced, so that the sintering temperature of the microwave dielectric ceramic can be reduced, and the dielectric property of the microwave dielectric ceramic can be improved. Compared with the conventional BaTi₄O₉The sintering temperature of the microwave dielectric ceramic material is reduced by about 30 ℃, the dielectric constant is about 36, the quality factor is high (Q multiplied by f is 35000 GHz-45000 GHz), the temperature coefficient of resonance frequency is close to zero (tau f is-10 ppm/DEG C), the temperature difference of thermal shock is 155-160 ℃, the thermal shock resistance is good, the requirement of 5G mobile communication application can be well met, and the microwave dielectric ceramic material is applied to radio frequency components.

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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a process flow of preparing a microwave dielectric ceramic material provided in embodiment 1 of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In a first aspect, the invention provides a microwave dielectric ceramic material, which is mainly prepared from a ceramic main material and a modifier;

the ceramic main material comprises BaTi according to the mol percentage₄O₉70 to 80 percent and BaZn_2.03Ti_3.89O_10.8920％～30％；

The modifying agent comprises at least one of a first modifying agent, a second modifying agent, or a third modifying agent;

the first modifier comprises Al₂O₃、SiO₂Or CuO;

the second modifier comprises BN and/or AlN;

the third modifier comprises MnCO₃、Nd₂O₃Or CeO₂At least one of (1).

Wherein, BaTi₄O₉For example, but not limited to, 70%, 72%, 74%, 76%, 78%, or 80%; BaZn_2.03Ti_3.89O_10.89For example, but not limited to, 20%, 22%, 24%, 26%, 28%, or 30%.

The term "BN and/or AlN" means that the second modifier may be BN, AlN, BN or AlN.

The microwave dielectric ceramic material provided by the invention is BaTi₄O₉As a main crystal phase, with BaZn_2.03Ti_3.89O_10.89Is a secondary crystalline phase. Wherein, BaTi₄O₉Has a dielectric constant of 38, BaZn_2.03Ti_3.89O_10.89The dielectric constant of the microwave dielectric ceramic is 30, and the combination of the dielectric constant of the microwave dielectric ceramic and the dielectric constant of the microwave dielectric ceramic can enable the dielectric constant of the microwave dielectric ceramic to be around 36. At the same time, BaTi₄O₉Temperature coefficient of resonance frequency τ_fIs +15 ppm/DEG C, BaZn_2.03Ti_3.89O_10.89Temperature coefficient of vibration frequency τ_fIs-30 ppm/DEG C, and the combination of the two is favorable for the temperature coefficient of the resonant frequency of the ceramic material to be close to zero. By mixing in BaTi₄O₉-BaZn_2.03Ti_3.89O_10.89BN and AlN are introduced into the system, so that the thermal shock resistance of the material can be greatly improved, and the first modifier and the third modifier which are composed of specific components are introduced, so that the sintering temperature of the microwave dielectric ceramic can be reduced, and the dielectric property of the microwave dielectric ceramic can be improved. Compared with the conventional BaTi₄O₉The sintering temperature of the microwave dielectric ceramic material is reduced by about 30 ℃, the dielectric constant is about 36, the quality factor is high (Q multiplied by f is 35000 GHz-45000 GHz), the temperature coefficient of resonance frequency is close to zero (tau f is-10 ppm/DEG C), the temperature difference of thermal shock is 155-160 ℃, the thermal shock resistance is good, the requirement of 5G mobile communication application can be well met, and the microwave dielectric ceramic material is applied to radio frequency components.

In some preferred embodiments, the BaTi₄O₉The preparation method comprises the following steps:

mixing BaO and TiO₂According to BaTi₄O₉Crushing and mixing the materials according to the stoichiometric ratio, and presintering the mixture to prepare the BaTi₄O₉。

In some preferred embodiments, the BaZn is_2.03Ti_3.89O_10.89The preparation method comprises the following steps:

mixing BaO, ZnO and TiO₂In accordance with BaZn_2.03Ti_3.89O_10.89Crushing and mixing the materials according to the stoichiometric ratio, and presintering the mixture to prepare the BaZn_2.03Ti_3.89O_10.89。

In BaTi₄O₉And BaZn_2.03Ti_3.89O_10.89In the preparation process of (3), the temperature of the pre-firing may be, for example, but not limited to, 1000 ℃, 1010 ℃, 1020 ℃, 1030 ℃, 1040 ℃ or 1050 ℃; the burn-in time may be, for example, but is not limited to, 3 hours, 3.5 hours, or 4 hours.

The preparation efficiency and sintering activity of the ceramic main material are improved by further optimizing and adjusting the pre-sintering process.

In some preferred embodiments, the modifier is 4% to 7% of the mass of the ceramic main material, for example, but not limited to, 4%, 5%, 6%, or 7%.

In some preferred embodiments, the first modifier is 3.5% to 5% of the mass of the ceramic main material, for example, but not limited to, 3.5%, 4%, 4.5% or 5%, which is beneficial for reducing the sintering temperature of the ceramic material; the second modifier is 0.3-1% of the ceramic main material by mass, for example, but not limited to, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1%, which is beneficial to improving the thermal shock resistance of the ceramic material; the third modifier is 0.2 to 1 percent of the mass of the ceramic main material, for example, but not limited to, 0.2, 0.4%, 0.6%, 0.8% or 1%, which is beneficial to improving the quality factor of the ceramic material and adjusting the temperature coefficient of the resonant frequency of the ceramic material.

In the invention, the modifier is added to mainly play a synergistic role with the ceramic main material, so that the overall performance of the microwave dielectric ceramic material is improved, and if the addition amount of the modifier is too much, the toughness and the microwave dielectric performance of the microwave dielectric ceramic material are reduced; if the amount of the modifier added is too small, the performance of the composition is not improved.

In some preferred embodiments, the first modifier is 3.5 to 4.5 percent of the mass of the ceramic main material; the second modifier accounts for 0.3-1% of the mass of the ceramic main material; the third modifier accounts for 0.2-0.5% of the mass of the ceramic main material.

In a second aspect, the invention provides a preparation method of a microwave dielectric ceramic material, which comprises the following steps:

crushing and mixing the ceramic main material, the modifier and the binder to obtain mixed slurry; granulating the mixed slurry to obtain granulated powder; and (3) dry-pressing the granulation powder into a green body, and sintering to obtain the microwave dielectric ceramic material.

The preparation method of the microwave dielectric ceramic material is simple and convenient to operate, quick and low in cost, and the microwave dielectric ceramic material prepared by the preparation method is excellent in performance, good in stability and suitable for wide application.

In some preferred embodiments, the binder comprises polyvinyl alcohol and/or polyacrylic acid, or other commercially available binders known in the art.

Preferably, the means of comminution comprises ball milling and/or sand milling.

In some preferred embodiments, the average particle size of the granulated powder may be, for example, but not limited to, 50 μm, 70 μm, 90 μm, 110 μm, 130 μm, or 150 μm.

For example, the particle size of the obtained granulation powder is 50-150 μm by controlling the rotating speed and the feeding speed of the rotating wheel in the spray granulation process, so that the material flowability is ensured to be stronger, and the consistency and the stability of the dry-pressed density of the green body and the microwave medium ceramic are improved.

In some preferred embodiments, the green body has a dry weight density of 2.4 to 2.7g/cm³The dry pressing density of the green body is controlled to be uniform, so that the consistency and reliability of the product are improved, and a certain strength is provided for sintering the green body.

Preferably, the temperature of the sintering may be, for example, but not limited to, 1080 ℃, 1090 ℃, 1100 ℃, 1110 ℃, 1120 ℃, 1130 ℃, 1140 ℃ or 1150 ℃; the sintering time may be, for example, but is not limited to, 3h, 3.5h, or 4 h.

In the invention, the sintering treatment is carried out under the condition of controlling longer heat preservation time, which is beneficial to improving the performance of the prepared microwave dielectric ceramic material.

In a third aspect, the invention provides an application of a microwave dielectric ceramic material in a radio frequency component.

The microwave dielectric ceramic material provided by the invention has a dielectric constant epsilon_rAbout 36, the quality factor is high, the temperature coefficient of the resonant frequency is close to zero, the temperature difference of thermal shock is 155-160 ℃, the thermal shock resistance is good, and the material can be applied to radio frequency components.

The invention is further illustrated by the following specific examples and comparative examples, but it should be understood that these examples are for purposes of illustration only and are not to be construed as limiting the invention in any way.

Example 1: microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic material comprises a ceramic main material and a modifier, wherein the ceramic main material comprises: BaTi₄O₉ 70mol％，BaZn_2.03Ti_3.89O_10.8930mol percent; the modifier accounts for 4 percent of the weight of the ceramic main material, wherein the first modifier is CuO accounting for 3.0 percent of the weight of the ceramic main material and SiO accounting for 0.5 percent of the weight of the ceramic main material₂The second modifier is BN accounting for 0.3 percent of the weight of the ceramic main material, and the third modifier is CeO accounting for 0.2 percent of the weight of the ceramic main material₂。

Wherein, BaTi₄O₉The preparation method comprises the following steps: mixing BaO and TiO₂According to BaTi₄O₉Pulverizing and mixing according to a stoichiometric ratio, and presintering at 1030 ℃ for 3.5 hours to obtain the product; BaZn_2.03Ti_3.89O_10.89The preparation method comprises the following steps: mixing BaO, ZnO and TiO₂According to BaTi₄O₉Pulverizing and mixing according to a stoichiometric ratio, and presintering at 1030 ℃ for 3.5h to obtain the product.

The preparation method of the microwave dielectric ceramic material (as shown in figure 1) is as follows:

s11, providing a binder (polyvinyl alcohol), and placing the mixture of the ceramic main material, the modifier and the binder in a formula ratio in a ball mill for ball milling and mixing to obtain mixed slurry;

s12, carrying out spray granulation on the mixed slurry to obtain granulated powder with the average particle size of 50 microns;

s13, pressing and molding the granulated powder to obtain a blank body, wherein the dry pressing density of the blank body is 2.4g/cm³And (3) sintering the cylindrical green body with the diameter of 15.56 multiplied by 7.78mm at 1080 ℃ for 3 hours to obtain the microwave dielectric ceramic material.

Example 2: microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic material comprises a ceramic main material and a modifier, wherein the ceramic main material comprises: BaTi₄O₉ 72.5mol％，BaZn_2.03Ti_3.89O_10.8927.5 mol%; the modifier accounts for 4.5 percent of the weight of the ceramic main material, wherein the first modifier is CuO accounting for 3.0 percent of the weight of the ceramic main material and SiO accounting for 1 percent of the weight of the ceramic main material₂The second modifier is BN accounting for 0.3 percent of the weight of the ceramic main material, and the third modifier is Nd accounting for 0.2 percent of the weight of the ceramic main material₂O₃。

Wherein, BaTi₄O₉And BaZn_2.03Ti_3.89O_10.89In accordance with example 1.

The preparation method of the microwave dielectric ceramic material based on the above comprises the following steps:

s21, providing a binder (polyvinyl alcohol), and placing the mixture of the ceramic main material, the modifier and the binder in a formula ratio in a ball mill for ball milling and mixing to obtain mixed slurry;

s22, carrying out spray granulation on the mixed slurry to obtain granulated powder with the average particle size of 100 microns;

s23, pressing and molding the granulated powder to obtain a blank body, wherein the dry pressing density of the blank body is 2.5g/cm³And (3) sintering the cylindrical green body with the diameter of 15.56 multiplied by 7.78mm at 1100 ℃ for 3h to obtain the microwave dielectric ceramic material.

Example 3: microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic material comprises a ceramic main material and a modifier, wherein the ceramic main material comprises: BaTi₄O₉75mol％，BaZn_2.03Ti_3.89O_10.8925mol percent; the modifier accounts for 5 percent of the weight of the ceramic main material, wherein the first modifier is CuO accounting for 3.0 percent of the weight of the ceramic main material and Al accounting for 1 percent of the weight of the ceramic main material₂O₃The second modifier is BN accounting for 0.3 percent of the weight of the ceramic main material and AlN accounting for 0.3 percent of the weight of the ceramic main material, and the third modifier is MnCO accounting for 0.2 percent of the weight of the ceramic main material₃And 0.2% of CeO₂。

Wherein, BaTi₄O₉And BaZn_2.03Ti_3.89O_10.89In accordance with example 1.

The preparation method of the microwave dielectric ceramic material based on the above comprises the following steps:

s31, providing a binder (polyvinyl alcohol), and placing the mixture of the ceramic main material, the modifier and the binder in a formula ratio in a ball mill for ball milling and mixing to obtain mixed slurry;

s32, carrying out spray granulation on the mixed slurry to obtain granulated powder with the average particle size of 100 microns;

s33, pressing and molding the granulated powder to obtain a blank body, wherein the dry pressing density of the blank body is 2.6g/cm³And (3) cylindrical green bodies with the diameter of 15.56 multiplied by 7.78mm, and sintering the green bodies at 1120 ℃ for 4 hours to obtain the microwave dielectric ceramic material.

Example 4: microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic material comprises a ceramic main material and a modifier, wherein the ceramic main material comprises: BaTi₄O₉77.5mol％，BaZn_2.03Ti_3.89O_10.8922.5 mol%; the modifier accounts for 5.5 percent of the weight of the ceramic main material, wherein the first modifier is CuO accounting for 3.0 percent of the weight of the ceramic main material and SiO accounting for 0.5 percent of the weight of the ceramic main material₂And 0.5% of Al₂O₃The second modifier is BN accounting for 0.5 percent of the weight of the ceramic main material and AlN accounting for 0.5 percent of the weight of the ceramic main material, and the third modifier is MnCO accounting for 0.3 percent of the weight of the ceramic main material₃And 0.2% of CeO₂。

Wherein, BaTi₄O₉And BaZn_2.03Ti_3.89O_10.89In accordance with example 1.

The preparation method of the microwave dielectric ceramic material based on the above comprises the following steps:

s41, providing a binder (polyacrylic acid), and placing the mixture of the ceramic main material, the modifier and the binder in a formula ratio in a ball mill for ball milling and mixing to obtain mixed slurry;

s42, carrying out spray granulation on the mixed slurry to obtain granulated powder with the average particle size of 100 microns;

s43, pressing and molding the granulated powder to obtain a blank body, wherein the dry pressing density of the blank body is 2.7g/cm³And (3) sintering the cylindrical green body with the diameter of 15.56 multiplied by 7.78mm at 1140 ℃ for 4 hours to obtain the microwave dielectric ceramic material.

Example 5: microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic material comprises a ceramic main material and a modifier, wherein the ceramic main material comprises: BaTi₄O₉80mol％，BaZn_2.03Ti_3.89O_10.8920mol percent; the modifier accounts for 6 percent of the weight of the ceramic main material, wherein the first modifier is CuO accounting for 3.0 percent of the weight of the ceramic main material and SiO accounting for 1 percent of the weight of the ceramic main material₂And 0.5% of Al₂O₃The second modifier is BN accounting for 0.5 percent of the weight of the ceramic main material and AlN accounting for 0.5 percent of the weight of the ceramic main material, and the third modifier is Nd accounting for 0.3 percent of the weight of the ceramic main material₂O₃And 0.2% of CeO₂。

Wherein, BaTi₄O₉And BaZn_2.03Ti_3.89O_10.89In accordance with example 1.

The preparation method of the microwave dielectric ceramic material based on the above comprises the following steps:

s51, providing a binder (polyacrylic acid), and placing the mixture of the ceramic main material, the modifier and the binder in a formula ratio in a ball mill for ball milling and mixing to obtain mixed slurry;

s52, carrying out spray granulation on the mixed slurry to obtain granulated powder with the average particle size of 150 microns;

s53, pressing and molding the granulated powder to obtain a blank body, wherein the dry pressing density of the blank body is 2.7g/cm³And (3) cylindrical green bodies with the diameter of 15.56 multiplied by 7.78mm, and sintering the green bodies at 1150 ℃ for 4 hours to obtain the microwave dielectric ceramic material.

Comparative example 1: microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic material comprises a ceramic main material and a modifier, wherein the ceramic main material comprises: BaTi₄O₉85mol％，BaZn₂Ti₄O₁₁15mol percent; the modifier accounts for 5 percent of the weight of the ceramic main material, wherein the first modifier is CuO accounting for 3.0 percent of the weight of the ceramic main material and SiO accounting for 0.5 percent of the weight of the ceramic main material₂And 0.5% of Al₂O₃The second modifier is BN accounting for 0.5 percent of the weight of the ceramic main material, and the third modifier is CeO accounting for 0.5 percent of the weight of the ceramic main material₂。

The preparation method of the microwave dielectric ceramic material based on the above comprises the following steps:

s61, providing a binder (polyacrylic acid), and placing the mixture of the ceramic main material, the modifier and the binder in a formula ratio in a ball mill for ball milling and mixing to obtain mixed slurry;

s62, carrying out spray granulation on the mixed slurry to obtain granulated powder with the average particle size of 150 microns;

s63, pressing and molding the granulated powder to obtain a blank body, wherein the dry pressing density of the blank body is 2.7g/cm³And c, sintering the cylindrical green body with the diameter of 15.56 multiplied by 7.78mm at 1260 ℃ for 4 hours to obtain the microwave dielectric ceramic material.

Comparative example 2: microwave dielectric ceramic material and preparation method thereof

The difference from example 5 is that the first modifier is not added.

Comparative example 3: microwave dielectric ceramic material and preparation method thereof

The difference from example 5 is that no second modifier is added.

Comparative example 4: microwave dielectric ceramic material and preparation method thereof

The difference from example 5 is that no third modifier is added.

Test example 1

The microwave dielectric ceramic materials obtained in examples 1 to 5 and comparative examples 1 to 4 were tested for their microwave dielectric properties by using a microwave network analyzer, and their thermal shock properties were tested, and the test results are shown in table 1.

Table 1: microwave dielectric property test and thermal shock resistance test results of the microwave dielectric ceramic materials in examples 1-5 and comparative examples 1-4

As shown in Table 1, the microwave dielectric ceramic materials obtained in examples 1 to 5 had relative dielectric constants ε_r35.02 to 37.04, a quality factor Qxf of 35265GHz to 45089GHz, and a temperature coefficient of resonance frequency tau_f9.98 ppm/DEG C to 9.77 ppm/DEG C, and the thermal shock temperature difference is 155-160 ℃; relative dielectric constant ε of the microwave dielectric ceramic material obtained in comparative example 1_r35.50, quality factor Qxf 35265GHz, temperature coefficient of resonance frequency τ_fIs-3.74 ppm/DEG C, and the temperature difference of thermal shock is 120 ℃.

Therefore, compared with the microwave dielectric ceramic of the comparative example, the microwave dielectric ceramic material of the invention has the advantages of lower sintering temperature, more excellent microwave dielectric property and higher thermal shock resistance, and is suitable for wide application. The preparation method provided by the embodiment of the invention is convenient and rapid to operate, and the microwave dielectric ceramic material prepared by the preparation method has excellent performance and good stability and is suitable for wide application.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.