Crystalline glass and preparation method thereof

Abstract

The invention discloses crystallized glass and a preparation method thereof, and the crystallized glass is prepared from the following components in percentage by mass (mol%) of oxides: 45.5% to 72.5% of SiO2, 0.05% to 2.49% of P2O5, 6.5% to 17.5% of Al2O3, 0.1% to 4.78% of B2O3, 2.44% to 9.55% of Li2O, 0.11% to 12.84% of Na2O, 0.31% to 6.11% of K2O, 8.77% to 35.1% of MgO, 1.26% to 6.3% of CaO, 0.09% to 13.28% of TiO2, 0.04% to 2.22% of BaO, 0.06% to 8.58% of ZrO2, 2.0% to 10.2% of SrO and 0.1% to 1.0% of Fe2O3. The crystalline glass of the present invention contains a prescribed number of components for increasing the compressive stress layer and the stress depth, and by chemically strengthening the compressive stress layer with a mixed acid or by changing the order of single salt components, it is possible to increase the surface compressive stress of the compressive stress layer and reduce the central compressive stress, and it has excellent impact resistance due to high Young's modulus and high Hv hardness.

Description

Technical Field

[0001] The present invention relates to the technical field of glass products, and in particular to a crystallized glass and a preparation method thereof. Background Art

[0002] In consumer products, cover glass is used in portable electronic devices such as smartphones, tablets and personal computers to protect the display screen. Protective glass is also used in automotive optical devices to protect the lens.

[0003] In recent years, there has also been a demand for using these materials in housings that serve as outer casings for electronic devices. And there is an increasing demand for materials with high hardness and high light transmittance so that these devices can withstand rigorous use.

[0004] Existing cover glass materials have many disadvantages:

[0005] (1) Insufficient hardness;

[0006] (2) Insufficient light transmittance;

[0007] To this end, the present invention provides a method for preparing crystallized glass that meets the requirements. Summary of the invention

[0008] The object of the present invention is to provide a crystallized glass and a preparation method thereof to overcome the above-mentioned shortcomings and deficiencies of the prior art.

[0009] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0010] As a first aspect of the present invention, a crystallized glass comprises the following components in terms of the mass (mol%) percentage of oxides:

[0011] SiO2 accounts for 45.5% to 72.5%, P2O5 accounts for 0.05% to 2.49%, Al2O3 accounts for 6.5% to 17.5%, B2O3 accounts for 0.1% to 4.78%, Li2O accounts for 2.44% to 9.55%, Na2O accounts for 0.11% to 12.84%, K2O accounts for 0.31% to 6.11%, MgO accounts for 8.77% to 35.1%, CaO accounts for 1.26% to 6.3%, TiO2 accounts for 0.09% to 13.28%, BaO accounts for 0.04% to 2.22%, ZrO2 accounts for 0.06% to 8.58%, SrO accounts for 2.0% to 10.2%, and Fe2O3 accounts for 0.1% to 1.0%.

[0012] Furthermore, the main crystalline phase of the crystallized glass is nepheline, potassium nepheline, zirconium silicate, zirconium titanate, spinel, calcium aluminum spinel, magnesium titanate, and spinel solid solution contains one or more components selected therefrom.

[0013] Preferably, the grain diameter of the main crystalline phase is 0.1-100 nm and the crystallinity is 5-100%.

[0014] As a second aspect of the present invention, the present invention also provides a method for preparing crystallized glass, comprising the following steps:

[0015] S1: uniformly mixing, melting and cooling the raw materials to obtain the original glass, wherein the raw materials are composed of the following components by mass (mol%): SiO2 accounts for 45.5% to 72.5%, P2O5 accounts for 0.05% to 2.49%, Al2O3 accounts for 6.5% to 17.5%, B2O3 accounts for 0.1% to 4.78%, Li2O accounts for 2.44% to 9.55%, Na2 O accounts for 0.11% to 12.84%, K2O accounts for 0.31% to 6.11%, MgO accounts for 8.77% to 35.1%, CaO accounts for 1.26% to 6.3%, TiO2 accounts for 0.09% to 13.28%, BaO accounts for 0.04% to 2.22%, ZrO2 accounts for 0.06% to 8.58%, SrO accounts for 2.0% to 10.2%, and Fe2O3 accounts for 0.1% to 1.0%;

[0016] S1: subjecting the original glass to thermal nucleation treatment and crystal growth treatment to obtain crystallized glass.

[0017] Preferably, the mixing is carried out in a stirrer for 5-60 minutes; the melting is carried out in a quartz crucible, a zircon crucible or a platinum crucible at a melting temperature of 1500-1700°C.

[0018] Preferably, the temperature of the thermal nucleation treatment is 500° C. to 850° C., and the time of the thermal nucleation treatment is 30 to 4000 min; the temperature of the crystal growth treatment is 500° C. to 850° C., and the time of the crystal growth treatment is 30 to 1800 min.

[0019] Furthermore, the preparation method further comprises:

[0020] S3: Grinding and polishing the crystallized glass;

[0021] S4: Immerse the ground and polished crystallized glass in a salt solution containing potassium or sodium; form a compressive stress layer on the surface layer of the crystallized glass by heat strengthening treatment or ion implantation.

[0022] Preferably, the soaking time is 1 to 720 minutes, preferably 300 to 500 minutes; the temperature of the salt solution is 350° C. to 550° C.; the salt solution may be potassium nitrate or sodium nitrate.

[0023] Preferably, the specific method of heat strengthening treatment is: heating the temperature to 300° C. to 600° C. and then rapidly cooling the glass to form a compressive stress layer caused by the temperature difference between the surface and the interior of the crystallized glass.

[0024] Preferably, the ion implantation method is to use ions to impact the surface of the crystallized glass, with an acceleration energy and an acceleration voltage that do not damage the surface of the crystallized glass, so as to implant the ions into the surface of the crystallized glass to form a compressive stress layer.

[0025] The beneficial effects of the present invention are:

[0026] (1) The crystallized glass of the present invention contains a specified number of components that increase the compressive stress layer and the stress depth. By chemically strengthening the compressive stress layer with a mixed acid or by changing the order of the single salt components, the surface compressive stress of the compressive stress layer can be increased and the central compressive stress can be reduced. Due to the high Young's modulus and high Hv hardness, it has excellent impact resistance.

[0027] (2) The skeleton structure of the crystallized glass of the present invention is: SiO 2- Al2O3-MgO-FeO-ZrO2-TiO2-P2O5 (SrO-Li2O), this model structure has a strong structure. Based on this skeleton, the crystallized glass contains a specified number of components that increase the compressive stress layer and stress depth, such as K2O and Na2O. After ion exchange, this component does not affect the structure of the skeleton and has higher physical strength characteristics. At the same time, since it does not contain any coloring materials, it can remain colorless and transparent.

[0028] The composition of the present invention can produce hard, colorless, transparent crystallized glass.

[0029] The crystallized glass of the present invention contains predetermined amounts of components and has a structure in which a compressive stress layer and stress depth are increased.

[0030] In addition, the compressive stress layer can be chemically strengthened by changing the treatment sequence of the single salt components.

[0031] Therefore, while increasing the surface compressive stress, the central compressive stress can be reduced, thereby enhancing the impact resistance.

[0032] The crystallized glass of the present invention contains predetermined amounts of components and has a structure in which a compressive stress layer and stress depth are increased.

[0033] In addition, the compressive stress layer can be chemically strengthened by using mixed acids or changing the treatment sequence of single salt components.

[0034] Therefore, while increasing the surface compressive stress, the central compressive stress can be reduced, thereby enhancing the impact resistance.

[0035] It is noteworthy that one of the characteristics of the product of the present invention is that it does not require chemical strengthening treatment.

[0036] This property is achieved by adjusting the crystallization temperature and time to reduce the size of the crystal particles while increasing the crystallinity, thereby maintaining transmittance and enhancing impact resistance.

[0037] In other words, even without being strengthened, the crystallized glass of the present invention still has the characteristic of high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a TEM observation picture of the entire electron diffraction image crystal precipitate of the present invention.

[0039] Figure 2 This is a TEM observation picture of the electron diffraction image monomer crystal precipitate of the present invention.

[0040] Reference numerals: DETAILED DESCRIPTION

[0041] The composition and preparation method of the present invention are further described in detail below in conjunction with specific examples, but the present invention is not limited to the following implementation modes and examples and can be implemented with appropriate changes within the scope of the purpose of the present invention.

[0042] In this specification, the content of each component is expressed in mass % of oxide conversion unless otherwise specified. Here, "oxide conversion" means that the amount of each oxide contained in the crystallized glass is expressed in mass (mol %) when the total mass of the oxide is set to 100 mass (mol %), assuming that all the constituent components of the crystallized glass are decomposed and changed into oxides. In this specification, 0% means that the content is 0%.

[0043] Example

[0044] The present invention provides a crystallized glass, which contains the following components in terms of the mass (mol%) percentage of oxides:

[0045] SiO2 accounts for 45.5% to 72.5%, P2O5 accounts for 0.05% to 2.49%, Al2O3 accounts for 6.5% to 17.5%, B2O3 accounts for 0.1% to 4.78%, Li2O accounts for 2.44% to 9.55%, Na2O accounts for 0.11% to 12.84%, K2O accounts for 0.31% to 6.11%, MgO accounts for 8.77% to 35.1%, CaO accounts for 1.26% to 6.3%, TiO2 accounts for 0.09% to 13.28%, BaO accounts for 0.04% to 2.22%, ZrO2 accounts for 0.06% to 8.58%, SrO accounts for 2.0% to 10.2%, and Fe2O3 accounts for 0.1% to 1.0%.

[0046] SiO2 is a glass-forming component that forms a network structure of glass. On the other hand, if the SiO2 component is insufficient, the resulting glass lacks chemical durability and has poor resistance to devitrification. In the present invention, the upper limit of the content of the SiO2 component is preferably ≤72.5%, more preferably ≤71.0%, further preferably ≤70.0%, and most preferably ≤69.0%; the lower limit of the content of the SiO2 component is ≥45.5%, more preferably ≥46.0%, further preferably ≥47.0%, and most preferably ≥48.0%.

[0047] The content of P2O5 component is ≥0.05%, which is a nucleating agent during glass crystallization and can improve the resistance of glass to devitrification. In particular, reducing the content of P2O5 component to below 2.49% can improve the melting performance of glass and reduce the devitrification tendency of glass. In the present invention, the upper limit of the content of P2O5 component is ≥2.49%, more preferably ≥2.38%, and most preferably ≥2.22%.

[0048] When the Al2O3 content is ≥6.5%, the viscosity of the glass during melting can be increased, and the chemical durability of the glass can be improved. In particular, when the Al2O3 content is reduced to ≤17.5%, the melting performance of the glass can be improved and the devitrification tendency of the glass can be weakened. In the present invention, the upper limit of the Al2O3 content is preferably ≤17.5%, more preferably ≤16.5%, and most preferably ≤15.5%.

[0049] The B2O3 component helps to reduce the viscosity of the glass and improve its solubility and formability. Preferably, the upper limit of B2O3 is ≤4.78% and the lower limit is ≥0.1%.

[0050] Li2O, K2O, and Na2O components participate in ion exchange during the chemical strengthening process. Among them, Li2O, K2O, and Na2O are nucleating agents (auxiliaries) of crystallization precipitation components, and are exchanged with (K+) and (Li+) during ion exchange. They have the effect of reducing dissolution viscosity and preventing dissolution devitrification (devitrification-resistant components); and excessive content may deteriorate chemical durability and anti-permeability. In the present invention, the upper limit of Li2O is ≤9.55% and the lower limit is ≥2.44%; the upper limit of Na2O is ≤12.84% and the lower limit is ≥0.11%, and the upper limit of K2O is ≤6.11% and the lower limit is ≥0.31%.

[0051] MgO has the function of reducing the viscosity of molten glass when the glass is melted. Preferably, the upper limit of MgO is ≤35.1% and the lower limit is ≥8.77%.

[0052] CaO has the effect of increasing the strain point of glass and improving the chemical durability of glass. Preferably, the upper limit of CaO is ≤ 6.3% and the lower limit is ≥ 1.26%.

[0053] TiO2 is a nucleating agent during glass crystallization and can also improve chemical durability. Preferably, the upper limit of TiO2 is ≤13.28% and the lower limit is ≥0.09%.

[0054] BaO has the effect of increasing the strain point of glass and improving the chemical durability of glass. Preferably, the upper limit of BaO is ≤ 2.22% and the lower limit is ≥ 0.04%.

[0055] ZrO2 is a nucleating agent during glass crystallization and can also improve chemical durability. Preferably, the upper limit of ZrO2 is ≤8.58% and the lower limit is ≥0.06%.

[0056] SrO reduces the high-temperature viscosity of the glass melt when it coexists with MgO, and has a function of suppressing devitrification. The upper limit of SrO is ≤ 10.2%, and the lower limit is ≥ 2.0%.

[0057] FeO is a nucleating agent for glass crystallization and is also a clarifying compound. However, excessive content may lead to platinum alloying. The upper limit of FeO is ≤1.0% and the lower limit is 0.1%.

[0058] The crystallized glass skeleton structure of the present invention is:

[0059] SiO 2- Al2O3-MgO-FeO-ZrO2-TiO2-P2O5 (SrO-Li2O), the structure of this model has firmness. On the basis of this skeleton, the crystallized glass contains a specified number of components that increase the compressive stress layer and stress depth, such as K2O and Na2O components, which do not affect the structure of the skeleton after ion exchange and have higher physical strength characteristics. At the same time, since it does not contain any coloring material, it can remain colorless and transparent. In summary, the composition of the components of the present invention will produce hard, colorless and transparent crystallized glass.

[0060] In one embodiment, the main crystalline phase of the crystallized glass is nepheline Na3K (Al4SiO4O 16 ), potassium nephrite (KAlSiO4), zirconium silicate (ZrSiO4), zirconium titanate (ZrTiO4), spinel (MgAl2O4), calcium aluminum spinel (FeAl2O4), magnesium titanate (Mg2TiO4), spinel solid solution (Fe2TiO4) contain one or more components selected therefrom, and the grain diameter of the main crystalline phase is 0.1 to 100 nm and the crystallinity is 5 to 100%.

[0061] The present invention also provides a method for preparing the above-mentioned crystallized glass, comprising the following steps:

[0062] S1: uniformly mixing, melting and cooling raw materials to obtain raw glass, wherein the raw materials are composed of the following components in percentage by mass (mol%):

[0063] SiO2 accounts for 45.5% to 72.5%, P2O5 accounts for 0.05% to 2.49%, Al2O3 accounts for 6.5% to 17.5%, B2O3 accounts for 0.1% to 4.78%, Li2O accounts for 2.44% to 9.55%, Na2O accounts for 0.11% to 12.84%, K2O accounts for 0.31% to 6.11%, MgO accounts for 8.77% to 35.1%, CaO accounts for 1.26% to 6.3%, TiO2 accounts for 0.09% to 13.28%, BaO accounts for 0.04% to 2.22%, ZrO2 accounts for 0.06% to 8.58%, SrO accounts for 2.0% to 10.2%, and Fe2O3 accounts for 0.1% to 1.0%;

[0064] In one embodiment, mixing is carried out in a mixer for 5 to 60 minutes, and the mixer speed is 1.0 to 30 rpm; melting is carried out in a quartz crucible, a zircon crucible or a platinum crucible, the melting temperature is 1500 to 1700°C, and the melting time is 2 to 72 hours. When cooling and molding, the temperature is lowered to between 1000°C and 1450°C, poured into a mold and slowly cooled to produce the original glass.

[0065] S2: subjecting the original glass to thermal nucleation treatment and crystal growth treatment to obtain crystallized glass;

[0066] In one embodiment, the temperature of the thermal nucleation treatment is 500° C. to 850° C., and the time of the thermal nucleation treatment is 30 to 4000 min; the temperature of the crystal growth treatment is 500° C. to 850° C., and the time of the crystal growth treatment is 30 to 1800 min.

[0067] As a further embodiment of the present invention: the preparation method further comprises S3:

[0068] S3: Grinding and polishing the crystallized glass;

[0069] As a further embodiment of the present invention: the preparation method further comprises S4:

[0070] S4: Immersing the ground and polished crystallized glass in a salt solution containing potassium or sodium;

[0071] In one embodiment: the soaking time is 1 to 720 minutes, preferably 300 to 500 minutes; the temperature of the salt solution is 350° C. to 550° C.; the salt solution may be potassium nitrate (KNO3) or sodium nitrate (NaNO3);

[0072] S4: forming a compressive stress layer on the surface layer of the crystallized glass by heat strengthening treatment or ion implantation;

[0073] In one embodiment: the specific method of heat strengthening treatment is: heating to 300°C ~ 600°C, and then rapidly cooling to form a compressive stress layer caused by the temperature difference between the surface and the inside of the crystallized glass; ion implantation method: using ions to impact the surface of the crystallized glass, so as not to destroy the acceleration energy and acceleration voltage of the crystallized glass surface, thereby implanting ions into the crystallized glass surface to form a compressive stress layer.

[0074] The following experiments are used to demonstrate the beneficial effects of the solution of the present invention. The specific experimental steps are as follows:

[0075] The raw materials are mixed and fed into a platinum crucible, melted in an electric furnace at 1500°C to 1700°C for 2 to 72 hours, and then the molten raw materials are stirred to make them uniform, and then the temperature is reduced to between 1000°C and 1450°C, poured into a mold and slowly cooled to produce raw glass;

[0076] The original glass was subjected to a one-step heat treatment (500-850°C, 5 hours) to nucleate and crystallize to produce crystallized glass; the obtained crystallized glass was analyzed using a 200kV field emission transmission electron microscope FE-TEM (manufactured by JEOL, model JEM2100F). The results showed that precipitated crystals with an average crystal diameter of between 0.1 and 100 nm were observed. Figure 1 This is a TEM observation picture of the entire electron diffraction image crystal precipitate of the present invention. Figure 2 TEM observation diagram of the electron diffraction image monomer crystal precipitate of the present invention. Figure 1 and Figure 2 As shown, further lattice image confirmation of electron diffraction images and EDX analysis confirmed that nepheline Na3K (Al4SiO4O 16 ), potassium nephrite (KAlSiO4), zirconium silicate (ZrSiO4), zirconium titanate (ZrTiO4), spinel (MgAl2O4), calcium aluminum spinel (FeAl2O4), magnesium titanate (Mg2TiO4), spinel solid solution (Fe2TiO4) as the main crystalline phase. Transmission electron microscopy was used to determine the 180×180nm 2 The crystal diameters of the crystal particles in the area are calculated and the average value is calculated.

[0077] The prepared crystallized glass mother material is cut and ground, and face-to-face parallel polishing is performed to obtain a substrate with a thickness of (0.50 mm for Examples 1 to 7) and (1.50 mm for Examples 8 to 15);

[0078] Crystallized glass is obtained by chemical strengthening after parallel polishing;

[0079] Evaluation and stress measurement of crystallized glass:

[0080] The following physical properties of the obtained crystallized glass were measured. The results are listed in Table 1, including thickness (mm), Young's modulus (E), surface hardness (Hv), surface compressive stress value (CS) and thickness of the compressive stress layer (stress depth DOL_zero).

[0081] For the crystallized glasses of Examples 1 to 15 and Comparative Examples 1 to 2 (where the comparative examples are experimental results of crystallized glasses obtained using the prior art formula), the crystallized glasses generally obtained meet CS1067.8-1688.8Mpa, DOL_zero 111.1 -555.5um to achieve the effect of the present invention, and the surface compressive stress value (CS) and the thickness of the compressive stress layer (stress depth DOL) are measured using the glass surface stress meter FSM-6000LE series manufactured by Orihara Manufacturing Co., Ltd. and the synthesized values ​​measured on the Li+ ion replacement measuring instrument SLP-2000. For the light source of the measuring machine used for CS measurement, a light source with a wavelength of 596nm is selected for measurement. The refractive index value at 596nm is used for CS measurement. The refractive index value at a wavelength of 596nm is calculated from the refractive index measurement values ​​of the C, d, F and g line wavelengths using the second-order approximation method according to the V-block method specified in JISB7071-2:2018. The central compressive stress value (CT) is determined by curve analysis.

[0082] It is noteworthy that one of the characteristics of the product of the present invention is that it does not require chemical strengthening treatment.

[0083] This property is achieved by adjusting the crystallization temperature and time to reduce the size of the crystal particles while increasing the crystallinity, thereby maintaining transmittance and enhancing impact resistance.

[0084] In other words, even without being strengthened, the crystallized glass of the present invention still has the characteristic of high strength.

[0085] Table 1 Composition and physical properties of crystallized glass

[0086]

[0087] It can be concluded from Table 1 that the crystallized glass obtained by the scheme of the present invention meets the requirements of CS1067.8-1688.8Mpa and DOL_zero 111.1 -555.5um, which can increase the surface compressive stress of the compressive stress layer and reduce the central compressive stress. Due to the high Young's modulus and high Hv hardness, it has the technical effect of excellent impact resistance.

[0088] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. The protection scope of the present invention shall be subject to the protection scope of the claims. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention, as long as it does not depart from the purpose of the present invention, the present invention can also have various changes, which still belong to the scope of the technical solution of the present invention.

Claims

1. A crystallized glass, characterized in that: Calculated by the mass (mol%) percentage of oxides, it contains the following components: SiO2 accounts for 45.5% to 72.5%, P2O5 accounts for 0.05% to 2.49%, Al2O3 accounts for 6.5% to 17.5%, B2O3 accounts for 0.1% to 4.78%, Li2O accounts for 2.44% to 9.55%, Na2O accounts for 0.11% to 12.84%, K2O accounts for 0.31% to 6.11%, MgO accounts for 8.77% to 35.1%, CaO accounts for 1.26% to 6.3%, TiO2 accounts for 0.09% to 13.28%, BaO accounts for 0.04% to 2.22%, ZrO2 accounts for 0.06% to 8.58%, SrO accounts for 2.0% to 10.2%, and Fe2O3 accounts for 0.1% to 1.0%.

2. The crystallized glass according to claim 1, characterized in that: The main crystalline phase of the crystallized glass is one or more components selected from nepheline, potassium nepheline, zirconium silicate, zirconium titanate, spinel, calcium aluminum spinel, magnesium titanate, and spinel solid solution.

3. The crystallized glass according to claim 2, characterized in that: The main crystalline phase has a grain diameter of 0.1-100 nm and a crystallinity of 5-100%.

4. A method for preparing crystallized glass according to claim 1, characterized in that: The following steps are involved: S1: uniformly mixing, melting and cooling raw materials to obtain raw glass, wherein the raw materials are composed of the following components in percentage by mass (mol%): SiO2 accounts for 45.5% to 72.5%, P2O5 accounts for 0.05% to 2.49%, Al2O3 accounts for 6.5% to 17.5%, B2O3 accounts for 0.1% to 4.78%, Li2O accounts for 2.44% to 9.55%, Na2O accounts for 0.11% to 12.84%, K2O accounts for 0.31% to 6.11%, MgO accounts for 8.77% to 35.1%, CaO accounts for 1.26% to 6.3%, TiO2 accounts for 0.09% to 13.28%, BaO accounts for 0.04% to 2.22%, ZrO2 accounts for 0.06% to 8.58%, SrO accounts for 2.0% to 10.2%, and Fe2O3 accounts for 0.1% to 1.0%; S2: subjecting the original glass to thermal nucleation treatment and crystal growth treatment to obtain crystallized glass.

5. The method for preparing a crystallized glass according to claim 4, characterized in that: In step S1, the mixing is carried out in a stirrer for 5 to 60 minutes at a stirring speed of 1.0 to 30 rpm; a quartz crucible, a zircon crucible or a platinum crucible is used for melting at a temperature of 1500 to 1700°C for 2 to 72 hours; during cooling and molding, the temperature is lowered to between 1000°C and 1450°C, poured into a mold and slowly cooled to produce the original glass.

6. The method for preparing a crystallized glass according to claim 4, characterized in that: In step S2, the temperature of the thermal nucleation treatment is 500°C to 850°C, and the time of the thermal nucleation treatment is 30 to 4000 min; the temperature of the crystal growth treatment is 500°C to 850°C, and the time of the crystal growth treatment is 30 to 1800 min.

7. The method for preparing a crystallized glass according to claim 4, characterized in that: Also includes, S3: grinding and polishing the crystallized glass; S4: Immersing the ground and polished crystallized glass in a salt solution containing potassium or sodium; forming a compressive stress layer on the surface layer of the crystallized glass by heat strengthening treatment or ion implantation.

8. The method for preparing a crystallized glass according to claim 7, characterized in that: In step S4, the soaking time is 1 to 720 minutes; the temperature of the salt solution is 350° C. to 550° C.; and the salt solution is potassium nitrate or sodium nitrate.

9. The method for preparing a crystallized glass according to claim 7, characterized in that: In step S4, the specific method of heat strengthening treatment is: after heating the temperature to 300° C. to 600° C., rapid cooling is performed to form a compressive stress layer generated by the temperature difference between the surface and the interior of the crystallized glass.

10. The method for preparing crystallized glass according to claim 7, characterized in that: In step S4, the ion implantation method is to use ions to impact the surface of the crystallized glass with an acceleration energy and an acceleration voltage that do not damage the surface of the crystallized glass, thereby implanting the ions into the surface of the crystallized glass to form a compressive stress layer.

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