Glass and preparation method thereof

Abstract

The invention discloses glass and a preparation method thereof, and the preparation method of the glass comprises the following steps: step S100, weighing glass raw materials according to the composition ratio, and carrying out ball milling treatment on the glass raw materials to form a raw material mixture; s200, heating and melting the raw material mixture to form molten glass; step S300, carrying out mold forming treatment on the molten glass to form base glass; step S400, carrying out heat treatment on the base glass to form a glass finished product; wherein the heat treatment adopts a gradient temperature change multiple induction nucleation-crystallization process. According to the invention, the strength and hardness of the glass are effectively enhanced.

Description

Technical Field

[0001] The present invention relates to the field of glass materials, and particularly to a glass and a preparation method thereof. Background Art

[0002] As an important amorphous inorganic non-metallic material, glass has excellent mechanical, optical, electrical, easy-to-process, good corrosion resistance and heat resistance characteristics, and is the main material for optical components, electronic display parts and building decoration supplies. With the continuous expansion of its application fields, various properties of glass materials also need to be improved urgently. In terms of mechanics, there is a large gap between the actual strength of glass and its theoretical strength, which is mainly caused by surface micro-cracks, mechanical scratches, internal inhomogeneity, etc. The strength and hardness of glass are crucial for expanding application scenarios and extending service life. Therefore, continuously improving the strength and hardness of glass through effective methods is the main research direction for its future development.

[0003] Currently, the main methods for enhancing the strength and hardness of glass are physical strengthening and chemical strengthening.

[0004] The physical strengthening method refers to heating the glass first to make it close to the softening temperature of the glass, and then rapidly cooling it; due to the different heat dissipation rates on the surface and inside of the glass, compressive stress is generated on the glass surface, while tensile stress is generated inside the glass. The stress difference between the glass surface and the inside makes the glass need to overcome the stress first before the glass body is damaged when the glass is damaged, thereby improving the strength of the glass. However, this physical strengthening method can only limitedly improve the strength of the glass. After the glass is physically strengthened, it cannot be processed such as cutting and grinding anymore. In addition, ultra-thin glass is not suitable for this strengthening method.

[0005] The chemical strengthening method is to change the chemical composition of the glass surface through ion exchange to form surface stress, thereby improving the strength of the glass. By using other alkali metal ions to exchange with Na+ or K+ ions on the surface layer of the glass, an ion exchange layer is formed on the surface. When cooled to room temperature, the glass is in a state where the inner layer is in tension and the outer layer is in compression, thereby achieving the purpose of increasing strength. However, the chemical strengthening method will add chemical strengthening processes, the process is complex, and the cost is increased. In addition, the molten salt generally uses nitrates and / or sulfates of alkali metal ions, and the molten salt is easily decomposed or volatilized at the chemical strengthening treatment temperature, polluting the environment.

[0006] How to overcome the above defects of the physical strengthening method and the chemical strengthening method and effectively enhance the strength and hardness of the glass is worthy of in-depth consideration by R & D personnel.

[0007] It should be noted that the above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0008] The main object of the present invention is to provide a glass and a preparation method thereof, aiming to effectively enhance the strength and hardness of the glass.

[0009] To achieve the above object, the present invention provides a glass, and the composition ratio of the glass is as follows: black talc 18 - 70 wt%; dolomite 5 - 30 wt%; feldspar 18 - 70 wt%; limestone 5 - 30 wt%; nucleating agent 0.05 - 10 wt%; decolorizing agent 0.005 - 2 wt%; fining agent 0.05 - 2 wt%.

[0010] Optionally, the nucleating agent is one or more combinations of ZrO2, P2O5, ZnO, and TiO2; and / or, the decolorizing agent is one or more combinations of Se powder, As2O3, CeO2, and BaSeO3; and / or, the fining agent is one or more combinations of Sb2O3, CaSO4, NaNO3, NaCl, and NaSiF.

[0011] To achieve the above object, the present invention also provides a glass preparation method, including the following steps: Weigh the glass raw materials according to the above composition ratio, and perform ball milling on the glass raw materials to form a raw material mixture; Perform heat melting treatment on the raw material mixture to form a glass melt; Perform die forming treatment on the glass melt to form a base glass; Perform heat treatment on the base glass to form a finished glass; wherein the heat treatment adopts a gradient temperature change multiple induction nucleation - crystallization process.

[0012] Optionally, in the step of performing ball milling on the glass raw materials to form a raw material mixture, the following steps are included: Add an appropriate amount of anhydrous ethanol to the glass raw materials and place them in a ball mill for ball milling so that the average particle size of the glass raw materials ≤ 100 nm; wherein the rotation speed of the ball mill is 300 - 600 r / min, and the ball milling time is 3 - 6 h; Place the uniformly mixed glass raw materials in a drying oven for drying treatment to form a raw material mixture.

[0013] Optionally, in the step of performing heat melting treatment on the raw material mixture to form a glass melt, the following steps are included: Place the raw material mixture in a melting furnace and heat it up to 1500 - 1700 °C, and the heating rate of the melting furnace is 4 - 10 °C / min; Adopt a temperature convection induction homogenization process to keep warm for 0.5 - 10 h to form a glass melt.

[0014] Optionally, the temperature convection-induced homogenization process includes performing multiple repeated temperature increases and decreases within the range of the melting point Tg ± 100 °C of the glass mixture, preferably within the range of the melting point Tg ± 50 °C of the glass mixture; and the number of repeated temperature increases and decreases ≥ 2. The multiple repeated temperature increases and decreases cause thermal convection inside the glass liquid, thereby promoting the migration of ions inside the glass liquid and the homogenization of the glass liquid, so as to achieve the purpose of obtaining a homogenized glass.

[0015] Optionally, in the step of subjecting the glass liquid to mold forming treatment to form a base glass, the following steps are included: Pour the glass liquid into a preheated mold; Place the mold together with the glass liquid in an annealing furnace at 400 - 600 °C and keep it warm for 5 - 24 h; After the heat preservation is completed, cool down to room temperature to obtain the base glass.

[0016] Optionally, in the step of subjecting the base glass to heat treatment to form a glass product, the following steps are included: Place the base glass in a heating furnace and perform heat treatment using a gradient temperature change multiple induction nucleation-crystallization process; Cool down the heat-treated base glass to room temperature to form a glass product.

[0017] Optionally, in the step of placing the base glass in a heating furnace and performing heat treatment using a gradient temperature change multiple induction nucleation-crystallization process, the following steps are included: The heating rate of raising the base glass to the nucleation temperature is 1 - 10 °C / min, preferably 1 - 5 °C / min; the single nucleation heat preservation time is 5 - 20 h; The heating rate of raising the base glass from the nucleation temperature to the crystallization temperature is 10 - 30 °C / min, preferably 15 - 25 °C / min; the single crystallization heat preservation time is 0.5 - 5 h; Optionally, in the step of cooling down the heat-treated base glass to room temperature to form a glass product, the cooling rate of the base glass is 10 - 45 °C / min, preferably 2 - 20 °C / min.

[0018] Compared with the prior art, the beneficial effects of the present invention: The present invention first weighs glass raw materials according to the composition ratio, subjects the glass raw materials to ball milling treatment to form a raw material mixture; then subjects the raw material mixture to heating and melting treatment to form a glass liquid; then subjects the glass liquid to mold forming treatment to form a base glass; and finally subjects the base glass to heat treatment to form a glass product; Among them, different from physical strengthening methods and chemical strengthening methods, the present invention adopts a gradient temperature change multiple induction nucleation-crystallization process during the heat treatment process; the gradient temperature change multiple induction nucleation-crystallization process is based on the controllable crystallization method of glass. Within the crystallization start temperature and crystallization temperature range of the glass, multiple nucleations of the glass and multiple crystallizations at different temperatures and different holding times are utilized (that is, the glass first nucleates and then is heated to a certain temperature for crystallization; then it is cooled to the nucleation temperature for nucleation, and then heated to a temperature different from the previous one for crystallization; this is repeated multiple times), so as to form a large number of uniformly distributed nanocrystals of different sizes inside the glass, and based on the interaction of nanocrystals of different sizes, the high strength and high hardness of the glass are finally realized.

[0019] Adopting the gradient temperature change multiple induction nucleation-crystallization process can not only effectively improve the strength and hardness of the glass, but also the glass can be further processed such as cutting and polishing after strengthening; at the same time, no chemical strengthening process is added, there is no decomposition or volatilization of molten salt during the chemical strengthening process, and the environment is not polluted; it is applicable to the strengthening of all system glasses, and the obtained glass has high strength and hardness, and is applicable to fields such as glass covers.

[0020] Specifically, the hardness of the prepared glass is 6.0 - 10.0 GPa, the flexural strength is 100 - 300 MPa, the compressive strength is 300 - 600 MPa, the transmittance of a 2 mm sample at 300 - 1200 nm is as high as 60 - 90%, and the thermal expansion coefficient (25 - 600 °C) is 15.00 - 50.00×10 -7 / °C. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a step flow chart of an embodiment of the glass preparation method of the present invention; Figure 2 It is an XRD pattern of the nanocrystals precipitated after the glass is strengthened.

[0023] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings in the present invention. Obviously, what is described is only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0026] In addition, it should be noted that the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The present invention discloses a method for preparing glass, comprising the following steps: Step S100: Weigh glass raw materials according to the above composition ratio, and perform ball milling on the glass raw materials to form a raw material mixture; Step S200: Perform heat melting treatment on the raw material mixture to form glass liquid; Step S300: Perform mold forming treatment on the glass liquid to form a base glass; Step S400: Perform heat treatment on the base glass to form a glass product; wherein the heat treatment adopts a gradient variable temperature multi - induction nucleation - crystallization process.

[0028] Based on the above inventive concept, the present application discloses the following Embodiments 1 - 4: Embodiment 1: Step S100: Weigh the glass raw materials, where the glass raw materials include 18 wt% of black talc; 30 wt% of dolomite; 18 wt% of feldspar; 20 wt% of limestone; 10 wt% of nucleating agent (ZrO2); 2 wt% of decolorizer (As2O3); 2 wt% of fining agent (Sb2O3); Add the above glass raw materials with appropriate anhydrous ethanol and place them in a ball mill for ball milling. The rotation speed of the ball mill is 300 r / min, and the ball milling time is 3 h. Obtain a uniformly mixed glass raw material and place it in a drying oven for drying to obtain a raw material mixture; Step S200: Place the above raw material mixture in a melting furnace through a platinum crucible for heating and melting. Specifically, the melting furnace first heats from room temperature to 1620 °C at a heating rate of 4 °C / min and holds for 1 h, then reduces the furnace temperature to 1550 °C and holds for 0.5 h, then raises the furnace temperature to 1620 °C and holds for 0.5 h, then reduces the furnace temperature to 1550 °C and holds for 1 h, and finally raises the furnace temperature to 1620 °C and holds for 0.5 h; Obtain a uniformly melted glass liquid; Step S300: Pour the above glass liquid into a preheated mold; Then place the mold together with the glass liquid in an annealing furnace at 400 °C and hold for 5 h; After holding, cool down to room temperature with the furnace to obtain the base glass; Step S400: Place the above base glass in a heating furnace and perform heat treatment using a gradient variable temperature multiple induction nucleation - crystallization process; Specifically, first heat at a rate of 1 °C / min to the nucleation temperature of 580 °C and hold for 5 h, then heat at a rate of 10 °C / min to the crystallization temperature of 760 °C and hold for 0.5 h, then cool at a rate of 20 °C / min to the nucleation temperature of 580 °C and hold for 10 h, then heat at a rate of 20 °C / min to the crystallization temperature of 750 °C and hold for 1 h, then cool at a rate of 20 °C / min to the nucleation temperature of 580 °C and hold for 15 h, then heat at a rate of 20 °C / min to the crystallization temperature of 740 °C and hold for 1.5 h; After the heat treatment process is completed, the heating furnace cools down to room temperature at a rate of 10 °C / min to obtain high-strength and high-hardness glass.

[0029] In this example, the nanocrystals precipitated in the high-strength and high-hardness glass are Mg2Al4Si5O 18 crystalline phase, and the grain size is less than 60 nm; The hardness of the glass is 6.0 GPa, the flexural strength is 110 MPa, the compressive strength is 320 MPa, the transmittance of a 2 mm sample at 300 - 1200 nm is as high as 82%, and the thermal expansion coefficient (25 - 600 °C) is 18.00×10 -7 / °C.

[0030] Example 2: Step S100: Weigh glass raw materials, where the glass raw materials include 70 wt% of black talc; 5 wt% of dolomite; 18 wt% of feldspar; 4 wt% of limestone; 1 wt% of a nucleating agent (a mixture of ZrO2 and TiO2); 1 wt% of a decolorizing agent (a mixture of As2O3 and CeO2); 1 wt% of a fining agent (a mixture of Sb2O3 and CaSO4); Add an appropriate amount of absolute ethanol to the above glass raw materials and place them in a ball mill for ball milling. The rotation speed of the ball mill is 600 r / min, and the ball milling time is 6 h. Obtain a uniformly mixed glass raw material and place it in a drying oven for drying to obtain a raw material mixture; Step S200: Place the above raw material mixture in a platinum crucible and put it into a melting furnace for heating and melting treatment. Specifically, the melting furnace first heats up from room temperature to 1620 °C at a heating rate of 10 °C / min and holds for 1 h, then reduces the furnace temperature to 1550 °C and holds for 5 h, then raises the furnace temperature to 1620 °C and holds for 0.5 h, then reduces the furnace temperature to 1550 °C and holds for 1 h, and finally raises the furnace temperature to 1620 °C and holds for 2 h; Obtain a uniformly melted glass liquid; Step S300: Pour the above glass liquid into a preheated mold; Then place the mold together with the glass liquid in an annealing furnace at 450 °C and hold for 10 h; After holding, cool down to room temperature with the furnace to obtain a base glass; Step S400: Place the above base glass in a heating furnace and perform heat treatment using a gradient temperature change multiple induction nucleation - crystallization process; Specifically, first heat up at a rate of 10 °C / min to the nucleation temperature of 580 °C and hold for 20 h, then heat up at a rate of 10 °C / min to the crystallization temperature of 760 °C and hold for 0.5 h, then cool down at a rate of 20 °C / min to the nucleation temperature of 580 °C and hold for 5 h, then heat up at a rate of 20 °C / min to the crystallization temperature of 750 °C and hold for 1 h, then cool down at a rate of 20 °C / min to the nucleation temperature of 580 °C and hold for 15 h, then heat up at a rate of 20 °C / min to the crystallization temperature of 740 °C and hold for 1.5 h; After the heat treatment process is completed, the heating furnace cools down to room temperature at a rate of 45 °C / min to obtain a high-strength and high-hardness glass.

[0031] In this example, the nanocrystals precipitated in the obtained high-strength and high-hardness glass are Mg2Al4Si5O 18 crystalline phase, and the grain size is less than 90 nm; The hardness of the glass is 8.2 GPa, the flexural strength is 100 MPa, the compressive strength is 300 MPa, the transmittance of a 2 mm sample at 300 - 1200 nm is as high as 60%, and the thermal expansion coefficient (25 - 600 °C) is 50.00×10 -7 / °C.

[0032] Example 3: Step S100: Weigh glass raw materials, where the glass raw materials include 30 wt% of black talc; 18 wt% of dolomite; 21.895 wt% of feldspar; 30 wt% of limestone; 0.05 wt% of nucleating agent (a mixture of ZnO and TiO2); 0.005 wt% of decolorizing agent (a mixture of Se powder and BaSeO3); 0.05 wt% of fining agent (a mixture of Sb2O3 and NaSiF); Add the above glass raw materials with an appropriate amount of absolute ethanol and place them in a ball mill for ball milling treatment, where the rotation speed of the ball mill is 400 r / min and the ball milling time is 5 h, to obtain a uniformly mixed glass raw material and place it in a drying oven for drying treatment to obtain a raw material mixture; Step S200: Place the above raw material mixture in a platinum crucible and heat it in a melting furnace for melting treatment. Specifically, the melting furnace first heats up from room temperature to 1650 °C at a heating rate of 5 °C / min and holds for 1 h, then cools the furnace temperature to 1580 °C and holds for 2 h, then raises the furnace temperature to 1650 °C and holds for 0.5 h, then cools the furnace temperature to 1580 °C and holds for 1 h, and finally raises the furnace temperature to 1650 °C and holds for 3 h; to obtain a uniformly melted glass liquid; Step S300: Pour the above glass liquid into a preheated mold; then place the mold together with the glass liquid in an annealing furnace at 600 °C and hold for 24 h; after the holding is completed, cool it down to room temperature with the furnace to obtain a base glass; Step S400: Place the above base glass in a heating furnace and perform heat treatment using a gradient variable temperature multi - induced nucleation - crystallization process; specifically, first heat up at a rate of 10 °C / min to the nucleation temperature of 620 °C and hold for 15 h, then heat up at a rate of 10 °C / min to the crystallization temperature of 800 °C and hold for 0.5 h, then cool down at a rate of 20 °C / min to the nucleation temperature of 620 °C and hold for 10 h, then heat up at a rate of 20 °C / min to the crystallization temperature of 790 °C and hold for 3 h, then cool down at a rate of 20 °C / min to the nucleation temperature of 630 °C and hold for 18 h, then heat up at a rate of 20 °C / min to the crystallization temperature of 780 °C and hold for 2 h; after the heat treatment process is completed, the heating furnace cools down to room temperature at a rate of 2 °C / min to obtain a high - strength and high - hardness glass.

[0033] In this embodiment, the nanocrystals precipitated in the high - strength and high - hardness glass are (Mg4Al4)(Al4Si2)O 20 crystalline phase, and the grain size is less than 75 nm; the hardness of the glass is 7.5 GPa, the flexural strength is 200 MPa, the compressive strength is 600 MPa, the transmittance of a 2 - mm specimen in the range of 300 - 1200 nm is as high as 79%, and the thermal expansion coefficient (25 - 600 °C) is 40.00×10 -7 / °C.

[0034] Example 4: Step S100: Weigh glass raw materials, where the glass raw materials include 18 wt% of black talc; 5 wt% of dolomite; 70 wt% of feldspar; 5 wt% of limestone; 0.5 wt% of a nucleating agent (a mixture of ZrO2, P2O5, and ZnO); 1 wt% of a decolorizing agent (a mixture of Se powder, As2O3, and CeO2); 1 wt% of a clarifying agent (a mixture of Sb2O3, NaNO3, and NaCl); Add the above glass raw materials with an appropriate amount of absolute ethanol and place them in a ball mill for ball milling, where the rotation speed of the ball mill is 500 r / min and the ball milling time is 4 h to obtain a uniformly mixed glass raw material, and place it in a drying oven for drying to obtain a raw material mixture; Step S200: Place the above raw material mixture in a platinum crucible and heat it in a melting furnace for melting treatment. Specifically, the melting furnace first heats from room temperature to 1640 °C at a heating rate of 7 °C / min and holds for 2 h, then reduces the furnace temperature to 1560 °C and holds for 2 h, then raises the furnace temperature to 1640 °C and holds for 3 h, then reduces the furnace temperature to 1560 °C and holds for 1.5 h, and finally raises the furnace temperature to 1640 °C and holds for 1.5 h; to obtain a uniformly melted glass liquid; Step S300: Pour the above glass liquid into a preheated mold; then place the mold together with the glass liquid in an annealing furnace at 550 °C and hold for 12 h; after holding, cool it to room temperature with the furnace to obtain a base glass; Step S400: Place the above base glass in a heating furnace and perform heat treatment using a gradient temperature change multiple induction nucleation - crystallization process; specifically, first heat at a rate of 8 °C / min to the nucleation temperature of 620 °C and hold for 15 h, then heat at a rate of 20 °C / min to the crystallization temperature of 800 °C and hold for 0.5 h, then cool at a rate of 15 °C / min to the nucleation temperature of 620 °C and hold for 10 h, then heat at a rate of 25 °C / min to the crystallization temperature of 790 °C and hold for 3 h, then cool at a rate of 18 °C / min to the nucleation temperature of 630 °C and hold for 18 h, then heat at a rate of 30 °C / min to the crystallization temperature of 800 °C and hold for 2 h; after the heat treatment process is completed, the heating furnace cools to room temperature at a rate of 20 °C / min to obtain a high-strength and high-hardness glass.

[0035] The nanocrystals precipitated in the high-strength and high-hardness glass obtained in this example are MgAl2O4 and Mg2Al4Si5O 18 crystalline phases, and the grain size is less than 80 nm; the hardness of the glass is 10.0 GPa, the flexural strength is 300 MPa, the compressive strength is 480 MPa, the transmittance of a 2-mm sample at 300 - 1200 nm is as high as 90%, and the thermal expansion coefficient (25 - 600 °C) is 25.00×10-7 / °C.

[0036] It should be noted that other contents of the glass and its preparation method disclosed in the present invention are prior arts and will not be elaborated herein.

[0037] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All applications directly or indirectly using the present invention in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A glass, characterized in that, The composition ratio of the glass is as follows: black talc 18 - 70wt%; dolomite 5 - 30wt%; feldspar 18 - 70wt%; limestone 5 - 30wt%; nucleating agent 0.05 - 10wt%; decolorizing agent 0.005 - 2wt%; fining agent 0.05 - 2wt%.

2. The glass according to claim 2, characterized in that: The nucleating agent is one or a combination of more than one of ZrO2, P2O5, ZnO, and TiO2; and / or, the decolorizing agent is one or a combination of more than one of Se powder, As2O3, CeO2, and BaSeO3; and / or, the fining agent is one or a combination of more than one of Sb2O3, CaSO4, NaNO3, NaCl, and NaSiF.

3. A method for preparing glass, characterized in that: It includes the following steps: Weigh the glass raw materials according to the composition ratio described in any one of claims 1 - 2, and perform ball milling on the glass raw materials to form a raw material mixture; Perform heat melting treatment on the raw material mixture to form a glass melt; Perform mold forming treatment on the glass melt to form a base glass; Perform heat treatment on the base glass to form a glass product; Among them, the heat treatment adopts a gradient temperature change multiple induction nucleation - crystallization process.

4. The glass preparation method according to claim 3, characterized in that: In the step of performing ball milling on the glass raw materials to form a raw material mixture, it includes the following steps: Add an appropriate amount of anhydrous ethanol to the glass raw materials and place them in a ball mill for ball milling so that the average particle size of the glass raw materials ≤ 100nm; wherein the rotation speed of the ball mill is 300 - 600 r / min, and the ball milling time is 3 - 6 h; Place the uniformly mixed glass raw materials in a drying oven for drying treatment to form a raw material mixture.

5. The glass preparation method according to claim 3, characterized in that: In the step of performing heat melting treatment on the raw material mixture to form a glass melt, it includes the following steps: Place the raw material mixture in a melting furnace and heat it up to 1500 - 1700°C, and the heating rate of the melting furnace is 4 - 10°C / min; Adopt a temperature convection induced homogenization process to hold for 0.5 - 10 h to form a glass melt.

6. The glass preparation method according to claim 5, characterized in that: The temperature convection induced homogenization process includes performing multiple repeated temperature rises and falls within the range of the melting point Tg ± 100°C of the glass mixture, and the number of repeated temperature rises and falls ≥ 2.

7. The glass preparation method according to claim 3, characterized in that: In the step of performing mold forming treatment on the glass melt to form a base glass, it includes the following steps: Pour the glass melt into a preheated mold; Place the mold together with the glass melt in an annealing furnace at 400 - 600°C and hold for 5 - 24 h; After holding, cool down to room temperature to obtain the base glass.

8. The glass preparation method according to claim 3, characterized in that: In the step of performing heat treatment on the base glass to form a glass product, it includes the following steps: Place the base glass in a heating furnace and perform heat treatment using a gradient temperature change multiple induction nucleation - crystallization process; Cool down the heat - treated base glass to room temperature to form a glass product.

9. The method for preparing glass according to claim 8, characterized in that: In the step of placing the base glass in a heating furnace and performing heat treatment using a gradient temperature change multiple induction nucleation - crystallization process, it includes the following steps: The heating rate of raising the base glass to the nucleation temperature is 1 - 10°C / min, and the single - time nucleation holding time is 5 - 20h; The heating rate for heating the base glass from the nucleation temperature to the crystallization temperature is 10 - 30 °C / min, and the single crystallization holding time is 0.5 - 5 h.

10. The method for preparing glass according to claim 8, wherein: In the step of cooling the heat-treated base glass to room temperature to form a glass product, the cooling rate of the base glass is 10 - 45 °C / min.

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