阅读说明：本技术 玻璃壳体的强化方法、电子设备壳体及电子设备 (Glass shell strengthening method, electronic equipment shell and electronic equipment ) 是由 王语鉴 于 2021-08-02 设计创作，主要内容包括：本申请公开了玻璃壳体的强化方法、电子设备壳体及电子设备。玻璃壳体的强化方法包括：将玻璃壳体进行一次强化,得到一次强化玻璃。将一次强化玻璃在二次强化液中进行强化处理,以得到二次强化玻璃。其中,二次强化液包括纯度为99％以上的锡液。通过上述方式,本申请能够制备高强度的玻璃壳体。(The application discloses a glass shell strengthening method, an electronic device shell and an electronic device. The method for strengthening the glass shell comprises the following steps: and carrying out primary strengthening on the glass shell to obtain primary strengthened glass. And (3) performing strengthening treatment on the primary strengthened glass in a secondary strengthening solution to obtain secondary strengthened glass. Wherein the secondary strengthening liquid comprises tin liquid with the purity of more than 99 percent. Through the mode, the glass shell with high strength can be prepared.)

1. A method of strengthening a glass envelope, comprising:

carrying out primary strengthening on the glass shell to obtain primary strengthened glass;

carrying out secondary strengthening on the primary strengthened glass in secondary strengthening liquid to obtain secondary strengthened glass;

wherein the secondary strengthening liquid comprises tin liquid with the purity of more than 99 percent.

2. The strengthening method according to claim 1, wherein the time of the secondary strengthening treatment is 20 to 40min, and the temperature of the secondary strengthening treatment is 300 to 350 ℃.

3. The strengthening method according to claim 1, wherein the step of subjecting the primary strengthened glass to strengthening treatment in a secondary strengthening liquid comprises:

and under protective gas, placing the primary tempered glass in secondary tempered liquid to form a secondary stress layer on the surface of the glass shell to obtain the secondary tempered glass, wherein the protective gas comprises nitrogen.

4. The strengthening method according to claim 3,

the thickness of glass casing is less than or equal to 2mm, secondary tempered glass's surface compressive stress is 1000 ~ 1200MPa, the stress depth of layer of secondary stress is 7.2 ~ 8.5um, secondary tempered glass's central tensile stress is 50 ~ 95 MPa.

5. The strengthening method according to claim 1, wherein the step of performing secondary strengthening of the primary strengthened glass in a secondary strengthening liquid is preceded by:

and carrying out preheating treatment on the primary tempered glass, wherein the temperature of the preheating treatment is 250-300 ℃, and the time of the preheating treatment is 20-30 min.

6. The strengthening method according to any one of claims 1 to 5, further comprising, after the step of performing secondary strengthening of the primary strengthened glass in a secondary strengthening liquid:

carrying out liquid dropping cooling on the secondary tempered glass for 6-10 min under the protection gas, wherein the protection gas comprises nitrogen;

and cooling the secondary tempered glass to 5-15 ℃, and cleaning the secondary tempered glass by using weak alkali liquor.

7. The strengthening method of claim 1, wherein the step of primary strengthening the glass enclosure comprises:

placing the glass shell in first strengthening liquid to form a primary stress layer on the surface of the glass shell to obtain primary strengthened glass;

the first strengthening liquid comprises the following raw materials in percentage by mass: 60 to 70 percent of potassium nitrate and 30 to 40 percent of sodium nitrate.

8. The reinforcement method according to claim 7,

the temperature of the first strengthening liquid is 350-400 ℃, the time of primary strengthening is 100-150 min, the thickness of the glass shell is less than or equal to 2mm, the surface compressive stress of the primary strengthening glass is 465-605 MPa, the depth of a stress layer of the primary stress layer is 7.7-9.2 um, and the central tensile stress of the primary strengthening glass is 44-93 MPa.

9. An electronic device housing, characterized in that,

the electronic device casing is reinforced by the reinforcing method according to any one of claims 1 to 8.

10. An electronic device, comprising:

the electronic device housing of claim 9;

the display screen is installed in the electronic equipment shell.

Technical Field

The present disclosure relates to the field of glass processing technologies, and in particular, to a method for strengthening a glass housing, an electronic device housing, and an electronic device.

Background

The chemically strengthened glass generally refers to chemically strengthened glass, and a stress layer is formed on the glass by a chemical method, so that the glass can be effectively protected by the stress layer when the glass is subjected to an external force.

In the related art, glass strengthening is generally performed in an alkali salt bath, and ions having a small radius in the surface layer of glass are exchanged with ions having a large radius in the molten liquid. For example, lithium ions in the glass are exchanged with potassium or sodium ions in the melt, sodium ions in the glass are exchanged with potassium ions in the melt, and the volume difference of alkali ions is utilized to form the intercalation stress on the surface layer of the glass.

Disclosure of Invention

The technical problem mainly solved by the application is to provide a glass shell strengthening method, an electronic equipment shell and electronic equipment, which can improve the strength of glass.

In order to solve the technical problem, the application adopts a technical scheme that: the method for strengthening the glass shell comprises the steps of carrying out primary strengthening on the glass shell to obtain primary strengthened glass; and (3) performing strengthening treatment on the primary strengthened glass in a secondary strengthening solution to obtain secondary strengthened glass. Wherein the secondary strengthening liquid comprises tin liquid with the purity of more than 99 percent.

In order to solve the above technical problem, another technical solution adopted by the present application is: provided is an electronic device shell which is strengthened by the strengthening method provided by the application.

In order to solve the above technical problem, the present application adopts another technical solution: the electronic equipment comprises the electronic equipment shell and the display screen, wherein the display screen is installed in the electronic equipment shell.

The beneficial effect of this application is: be different from prior art's condition, this application carries out twice reinforcement to glass housing to use tin liquid as the liquid of reinforceing during the second time, make tin atom or tin ion get into glass's surface in the tin liquid, form the stress layer on the glass surface, can effectively promote the compressive stress value on glass surface, thereby promoted glass's intensity.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an electronic device;

FIG. 2 is a schematic structural diagram of an embodiment of an electronic device housing of the present application;

FIG. 3 is a schematic flow chart diagram illustrating an embodiment of a method for strengthening a glass housing according to the present disclosure;

FIG. 4 is a schematic diagram illustrating the components of a glass shell and a primary strengthening liquid before primary strengthening according to an embodiment of the method for strengthening a glass shell;

FIG. 5 is a schematic view showing the components of a glass shell and a primary strengthening liquid after a primary strengthening according to an embodiment of the method for strengthening a glass shell of the present application;

FIG. 6 is a schematic view showing the composition of a secondary strengthening liquid and a primary strengthened glass before secondary strengthening in an embodiment of the method for strengthening a glass housing according to the present invention;

FIG. 7 is a schematic view showing the composition of a secondary strengthening liquid and a primary strengthened glass after secondary strengthening according to an embodiment of the method for strengthening a glass housing of the present application;

FIG. 8 is a schematic flow chart illustrating another embodiment of a method for strengthening a glass envelope according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.

The application provides a method for strengthening a glass shell, an electronic device shell and an electronic device embodiment. As used herein, an "electronic device" (or simply "terminal") includes, but is not limited to, an apparatus that is configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network, and/or via a wireless interface (e.g., for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; a Personal Communications System (PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A cellular phone is an electronic device equipped with a cellular communication module. The electronic equipment shell is the shell of the electronic equipment, and the electronic equipment shell is strengthened by using a strengthening method of a glass shell, so that the electronic equipment shell has high abrasion resistance.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, mechanism, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, mechanisms, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device 100 includes an electronic device housing 110 and a display screen 120. The display screen 120 is mounted in the electronic device housing 110. Optionally, the electronic device 100 may further include, but is not limited to, a circuit board (not shown), a battery (not shown), other functional devices (not shown), and the like.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of an electronic device housing according to the present application. The electronic device housing 110 is applied to devices such as a mobile phone back shell, a computer housing, and an intelligent wearable device housing. Optionally, the electronic device housing 110 may further be provided with a camera interface, a charging interface, and a key interface, and the electronic device housing 110 may also be provided with a stereoscopic texture to improve the aesthetic property of the electronic device housing 110.

The electronic device case 110 is strengthened by the strengthening method of the glass case provided in the present application. In the present application, glass strengthening refers to secondary processing of the formed glass, and the strength of the glass is improved by changing the chemical composition of the glass surface, and the strengthened glass firstly counteracts the surface stress when bearing external force, and has strong bearing capacity, wind pressure resistance, cold and heat resistance, impact resistance and the like.

In the present application, the surface compressive stress of the glass shell refers to the compressive stress formed on the surface and inside of the glass after the particles penetrate into the glass shell, and generally, the compressive stress generated as the particles penetrate more is larger. The stress layer depth of the glass envelope refers to the depth of diffusion of the particles into the glass envelope. The central tensile stress of the glass shell refers to the stress generated by the balance compressive stress in the glass, and the compressive stress on one side in the thickness direction of the glass is zero, and the compressive stress on the other side is zero.

Typical glass strengthening methods may include high temperature ion exchange methods, low temperature ion exchange methods, and the like. Wherein, the low temperature ion exchange method is suitable for being used for glass with thinner thickness, and the principle of the low temperature ion exchange method is as follows: when the glass strain temperature is lower than the glass transition point, the glass is immersed in a molten salt of an alkali metal compound having an ionic radius larger than that of the alkali metal ion contained in the glass, and a large volume of ions in the molten salt is squeezed into a glass network. The space originally occupied by the small ions is replaced by molten salt. As the glass cools, the glass network shrinks and the bulky ions require more space, resulting in compressive stress on the glass surface. This surface compressive stress remains in the glass during cooling, thereby forming a dense compressive layer on the surface of the glass. The existence of the compression layer can reduce microcracks on the surface of the glass and form a pre-stress layer on the surface of the glass, thereby greatly improving the bending strength and the impact strength of the glass. At present, the low-temperature ion exchange method is carried out by using potassium and sodium molten salts such as potassium nitrite and sodium nitrite to replace sodium and lithium ions on the surface of the glass. The strengthening method of the glass shell does not use nitrite harmful to human bodies, and the strength of the glass shell is higher than that of the strengthened glass using the low-temperature ion exchange method. With regard to the method for strengthening the glass housing of the present application, please continue to refer to the following description of the embodiments of the method for strengthening the glass housing.

As shown in fig. 3, fig. 3 is a schematic flow chart of an embodiment of a method for strengthening a glass housing according to the present application, in which the method for strengthening a glass housing includes:

s11: and carrying out primary strengthening on the glass shell to obtain primary strengthened glass.

And carrying out primary strengthening on the prepared glass shell to obtain primary strengthened glass.

Alternatively, the glass may be produced by an overflow down-draw method, a slit down-draw method, or the like, and the produced glass has excellent flatness and smoothness without grinding and polishing. The prepared glass can be cut and hot-forged to shape so as to adjust the shape of the glass shell or prepare textures. In this embodiment, the thickness of the glass housing is less than or equal to 2mm, which is suitable for strengthening the glass surface by the low-temperature ion exchange method, and also conforms to the concept of lightness and thinness of the electronic device housing.

In this embodiment, the primary strengthening step of the glass envelope is performed by low-temperature ionization in the first strengthening liquid. The first strengthening liquid comprises the following raw materials in percentage by mass: 60 to 70 percent of potassium nitrate and 30 to 40 percent of sodium nitrate. The temperature of the primary strengthening is 350-400 ℃, and can be selected from 350 ℃, 360 ℃, 370 ℃, 380 ℃, 390 ℃ and 400 ℃. Potassium nitrate and sodium nitrate at this temperature are in a molten state, have high ion migration and diffusion rates, and are below the glass transition point. The glass transition point refers to a temperature at which the glass loses the glass state, plastic deformation can occur, and physical properties start to change rapidly, and glass below the transition point has a high viscosity. The temperature of the primary strengthening is not too high, and too high a temperature can soften the glass to reduce the compressive stress.

In this embodiment, the glass shell component produced by the overflow downdraw process may be aluminosilicate glass, and in other embodiments, the material of the glass shell may be other silicate glasses, soda lime glasses, sapphire glasses, and the like.

Specifically, the glass shell may be soaked in the first strengthening solution for the first strengthening, during the soaking process, lithium ions of the glass shell are replaced with sodium ions in the first strengthening solution, the sodium ions of the glass shell are exchanged with potassium ions in the first strengthening solution, and the sodium ions and the potassium ions generate compressive stress on peripheral particles in the glass shell to form a primary stress layer.

Optionally, the time for one strengthening is 100-150 min, which may be 100min, 105min, 110min, 115min, 120min, 125min, 130min, 135min, 140min, 145min, 150 min. The time for one strengthening is not suitable to be too long, and the glass is softened by overlong soaking to reduce the pressure stress.

In the embodiment, the thickness of the glass shell is less than or equal to 2mm, the surface compressive stress of the primary tempered glass is 465-605 MPa, the depth of the primary stress layer is 7.7-9.2 um, and the central tensile stress of the primary tempered glass is 44-93 MPa. The above values of the primary tempered glass are determined by the time of primary tempering and the content of the components of the primary tempering liquid.

FIG. 4 is a schematic view showing the components of the glass shell and the primary strengthening liquid before the primary strengthening in the embodiment of the glass shell strengthening method of the present application. Wherein, A is the primary strengthening liquid, B is the glass shell, and C is the contact surface of the glass shell and the primary strengthening liquid. Wherein, the primary strengthening liquid contains sodium ions 12 and potassium ions 13 with higher concentration, the glass shell contains lithium ions 11 and sodium ions 12, the lithium ions 11 and the sodium ions 12 are mainly adsorbed near oxygen ions in the glass shell, and the glass shell also contains a network structure formed by silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron. Potassium ions 13 and sodium ions 12 in the primary strengthening liquid can diffuse into the glass envelope and replace lithium ions 11 and sodium ions 12 in the glass envelope.

As shown in fig. 5, fig. 5 is a schematic composition diagram of a glass shell and a primary strengthening liquid after primary strengthening according to an embodiment of the method for strengthening a glass shell of the present application. Wherein, A is the primary strengthening liquid, B is the glass shell, and C is the contact surface of the glass shell and the primary strengthening liquid. After one strengthening, one strengtheningThe potassium ion 13 content in the chemical liquid is reduced, and the primary strengthening liquid contains a small amount of lithium ions 11 from the glass shell. The glass shell contains potassium ions 13 and sodium ions 12 from the primary strengthening liquid. Wherein the radius of the lithium ion isRadius of sodium ion isThe radius of potassium ion isThe potassium ions 13 and the sodium ions 12 form an embedding compression stress on the surface of the glass to form a primary stress layer, and further primary tempered glass is obtained.

Further, the glass housing may be preheated before the primary strengthening step. In a particular industrial manufacturing process, the glass envelope may be preheated in a preheating furnace. Placing a batch of glass shells in a preheating furnace, raising the temperature of the preheating furnace to 300-350 ℃ for 20-30 min, and then preserving the temperature of the glass shells in the preheating furnace for 20-30 min so as to ensure that the glass shells are fully and uniformly heated. In the preheating process of the preheating furnace, the glass shell is inserted into the stainless steel jig and is sequentially spaced by about 1-2 mm, so that a reserved space is provided for the glass shell to be subjected to thermal expansion, and the glass shell is prevented from being broken. After preheating, the temperature of the glass shell is raised to 300-350 ℃, the glass shell and the stainless steel jig are grabbed into a primary strengthening furnace by a mechanical gripper for primary strengthening, primary strengthening liquid with the potassium nitrate ratio of 60-70% and the sodium nitrate ratio of 30-40% is contained in the strengthening furnace, and the temperature of the primary strengthening liquid in the strengthening furnace is 350-400 ℃. The primary strengthening time of the glass shell in the primary strengthening furnace is 100-150 min. After the primary strengthening, the primary strengthened glass is cooled to room temperature in air by dropping liquid for about 6-10 min.

After the primary strengthening, the surface of the primary strengthened glass has a strong stress, which is the work of laying the mat for the secondary strengthening step of this embodiment. And the primary tempered glass in the embodiment does not contain nitrite and is harmless to human bodies.

S12: and performing secondary strengthening on the primary strengthened glass in a secondary strengthening solution to obtain secondary strengthened glass.

And (3) after the glass shell is strengthened through the steps, obtaining primary strengthened glass, and placing the primary strengthened glass in secondary strengthening liquid for secondary strengthening treatment to obtain secondary strengthened glass.

After the glass is subjected to primary strengthening treatment, the surface compressive stress of the glass is 465-605 MPa, but the glass subjected to primary strengthening can still be scratched or pierced by hard objects in daily use. And the concentration of potassium ions and sodium ions in the primary strengthening liquid can be reduced along with the strengthening time and the strengthening times, and the surface compressive stress value of the glass strengthened by the primary strengthening liquid after multiple uses is reduced. Therefore, in the embodiment, the strength of the glass can be improved by performing secondary strengthening on the primary strengthened glass.

Specifically, the secondary strengthening step is performed in a secondary strengthening solution, the secondary strengthening solution comprises a tin solution with the purity of 99%, and the primary strengthened glass is soaked in the secondary strengthening solution. The tin liquid is tin in a molten state, and the temperature of the second strengthening liquid is 300 to 350 ℃, for example, 300 ℃, 310 ℃, 320 ℃, 330 ℃, 340 ℃ and 350 ℃. At this temperature the tin is above the melting point of tin, the tin is liquid and the diffusion capacity of the tin increases. Tin liquid with purity of more than 99 percent contains tin atoms or tin ions, and in the process of carrying out secondary strengthening on the primary strengthened glass in the secondary strengthened liquid, the tin atoms or the tin ions can be diffused into the primary strengthened glass to form a secondary stress layer on the surface of the primary strengthened glass so as to obtain the secondary strengthened glass.

Optionally, the time of the secondary strengthening is 20-40 min, for example, 20min, 22min, 23min, 25min, 27min, 29min, 30min, 32min, 35min, 37min, 39min, 40 min.

In the present embodiment, the temperature of the secondary strengthening is lower than that of the primary strengthening, and the time of the secondary strengthening is shorter than that of the primary strengthening. Therefore, the energy consumption of the secondary strengthening is smaller than that of the primary strengthening, and the production period can be shortened.

In the embodiment, the thickness of the primary tempered glass is less than or equal to 2mm, after the secondary tempering, the surface compressive stress of the secondary tempered glass can reach 1000-1200 MPa, the depth of the secondary stress layer is 7.2-8.5 um, and the central tensile stress of the secondary tempered glass is 50-95 MPa. The above value of the secondary tempered glass is determined by the time of the secondary tempering and the content of the secondary tempering liquid. After the primary tempered glass is subjected to secondary tempering, the surface compressive stress can be effectively improved, and the strength of the secondary tempered glass is improved.

As shown in fig. 6, fig. 6 is a schematic composition diagram of a secondary strengthening liquid and a primary strengthened glass before secondary strengthening in an embodiment of the method for strengthening a glass housing according to the present application. Wherein A ' is secondary strengthening liquid, B ' is primary strengthened glass, and C ' is the contact surface of the secondary strengthening liquid and the primary strengthened glass. The secondary strengthening liquid contains tin atoms or tin ions 14 at a high concentration, and the primary strengthened glass contains lithium ions 11, sodium ions 12, potassium ions 13, and a network structure formed by silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons.

As shown in fig. 7, fig. 7 is a schematic composition diagram of a secondary strengthening liquid and a primary strengthened glass after secondary strengthening in an embodiment of the method for strengthening a glass housing according to the present application. Wherein A ' is secondary strengthening liquid, B ' is primary strengthened glass, and C ' is the contact surface of the secondary strengthening liquid and the primary strengthened glass. At this time, the tin atoms or tin ions 14 diffuse into the glass surface, and the tin atoms or tin ions 14 having a large ionic radius generate a compressive stress on the glass surface, thereby forming a secondary stress layer. The radius of the tin atom or tin ion 14 is aboutThe surface compressive stress value of the secondary strengthened glass obtained after secondary strengthening is larger than that of the primary strengthened glass, and the capability of resisting external impact load and crack propagation of the secondary strengthened glass is stronger than that of the primary strengthened glass.

In the specific industrial manufacturing process of this embodiment, the primary tempered glass may be subjected to a preheating treatment before being put into the secondary tempering solution for tempering. Preheating glass is carried out in a preheating furnace, batch primary tempered glass is inserted into a stainless steel jig, and each primary tempered glass is spaced by about 1-2 mm in sequence, so that a reserved space is provided for thermal expansion of a glass shell, and the glass shell is prevented from being broken. And (3) heating the preheating furnace to 250-300 ℃ for 20-30 min, and then preserving the temperature of the primary tempered glass in the preheating furnace for 20-30 min to ensure that the glass shell is fully and uniformly heated. After preheating, the temperature of the primary tempered glass is raised to 250-300 ℃, and the primary tempered glass and the stainless steel jig are grabbed into a secondary tempering furnace by a mechanical gripper for secondary tempering. Wherein, the secondary strengthening furnace contains tin liquid with the purity of more than 99 percent, and the temperature in the secondary strengthening furnace is 300-350 ℃. And protective gas is introduced into the secondary strengthening furnace to prevent the tin liquid and oxygen in the air from forming oxides in the secondary strengthening process. The shielding gas may be nitrogen and/or hydrogen. And (3) performing secondary strengthening on the primary strengthened glass in a secondary strengthening furnace for 20-40 min to obtain the secondary strengthened glass.

In this embodiment, the secondary strengthening liquid includes tin liquid with a purity of 99% or more, and the concentration of the tin liquid is high, so that the tin liquid can be reused to perform secondary strengthening for a plurality of times. The service life of the secondary strengthening liquid can reach 150pcs/kg (the number of secondary strengthening glass which can be prepared by each kilogram of secondary strengthening liquid) or more, so that the material of the secondary strengthening liquid can be saved, and the glass strength of the secondary strengthening liquid can be ensured not to be reduced due to the using times of the secondary strengthening liquid.

Optionally, as shown in fig. 8, after the step S12, the method may further include:

s13: and (3) carrying out liquid dropping cooling on the secondary tempered glass for 6-10 min under the protection gas.

The temperature of the secondary tempered glass obtained after the secondary tempering treatment is 300-350 ℃, and the secondary tempered glass needs to be cooled. And a dropping liquid cooling method is adopted for cooling, and the secondary tempered glass is dropped for 6-10 min and then cooled to room temperature.

In the uncooled state, the tin element reacts readily with oxygen to form oxides (e.g., tin dioxide or tin tetroxide), and thus a shielding gas, which may be nitrogen and/or hydrogen, is still introduced into the environment in which the droplets are cooled.

S14: and cooling the secondary tempered glass to 5-15 ℃, and cleaning the secondary tempered glass by using weak alkali liquor.

During the secondary strengthening and cooling process, tin may remain on the surface of the secondary strengthened glass, which does not enter the glass surface, and tin element may form tin oxide with oxygen on the surface of the secondary strengthened glass, which affects the appearance of the secondary strengthened glass. Therefore, the secondary tempered glass needs to be cleaned.

After the secondary tempered glass is cooled to room temperature, the temperature of the secondary tempered glass is reduced to 5-15 ℃, for example, 5 ℃, 8 ℃, 10 ℃, 12 ℃ and 15 ℃. The tin or tin oxide at low temperature shows intrinsic brittleness, and the secondary strengthened glass can be cleaned by using weak alkali liquor to clean the tin or tin oxide attached to the surface of the secondary strengthened glass. The weak alkaline solution can be weak alkaline solution such as sodium bicarbonate solution, sodium carbonate solution, sodium acetate solution, etc. And finally preparing the high-strength tempered glass shell after cleaning.

In summary, the present application provides a method for strengthening a glass housing, an electronic device housing and an electronic device. The strengthening method of the glass shell adopts the tin liquor as the secondary strengthening liquor to strengthen the glass shell, and the beneficial effects which can be realized include but are not limited to: the glass with higher strength than alkali metal chemically toughened glass can be prepared; the glass only needs to be strengthened for two times, the strengthening process is simple in industry, and the manufacturing period is short; the secondary strengthening treatment time is short, the strengthening temperature is low, and the energy is saved; the service life of the secondary strengthening liquid is long, and is about ten times of that of the alkali metal solution; the whole strengthening process of the glass shell does not contain toxic substances, and the prepared secondary strengthened glass is harmless to human skin.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.