CN112521015A - Microcrystalline glass suitable for producing light wall material and preparation method thereof - Google Patents
Microcrystalline glass suitable for producing light wall material and preparation method thereof Download PDFInfo
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- CN112521015A CN112521015A CN202110063994.1A CN202110063994A CN112521015A CN 112521015 A CN112521015 A CN 112521015A CN 202110063994 A CN202110063994 A CN 202110063994A CN 112521015 A CN112521015 A CN 112521015A
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- 239000011521 glass Substances 0.000 title claims abstract description 60
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 14
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000006064 precursor glass Substances 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 9
- 239000008395 clarifying agent Substances 0.000 claims description 8
- 229910021532 Calcite Inorganic materials 0.000 claims description 7
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims description 7
- 229910021538 borax Inorganic materials 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 7
- 235000017550 sodium carbonate Nutrition 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 239000004317 sodium nitrate Substances 0.000 claims description 7
- 235000010344 sodium nitrate Nutrition 0.000 claims description 7
- 239000004328 sodium tetraborate Substances 0.000 claims description 7
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000000454 talc Substances 0.000 claims description 7
- 229910052623 talc Inorganic materials 0.000 claims description 7
- 235000012222 talc Nutrition 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 239000011550 stock solution Substances 0.000 claims description 6
- 239000010456 wollastonite Substances 0.000 claims description 6
- 229910052882 wollastonite Inorganic materials 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 235000010755 mineral Nutrition 0.000 claims description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 4
- 229910052656 albite Inorganic materials 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 239000013081 microcrystal Substances 0.000 claims description 4
- 229940072033 potash Drugs 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- 235000015320 potassium carbonate Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Inorganic materials O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims description 3
- GHPGOEFPKIHBNM-UHFFFAOYSA-N antimony(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Sb+3].[Sb+3] GHPGOEFPKIHBNM-UHFFFAOYSA-N 0.000 claims description 3
- -1 basalt Substances 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000005034 decoration Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 2
- 239000010433 feldspar Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 239000002241 glass-ceramic Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0036—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents
- C03C10/0045—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents containing SiO2, Al2O3 and MgO as main constituents
Abstract
The microcrystalline glass suitable for producing light wall material and its preparation process includes the following steps: SiO 22 56~72%、Al2O3 7~13%、CaO 8~15%、MgO 2~6%、Fe2O3 0~0.5%、TiO2 0~2%、K2O 0~3%、Na2O 2~6%、BaO 2~4%、B2O32-5%. The microcrystalline glass prepared by the invention can be used in light wall materials, the strength and toughness of products are increased, meanwhile, the microcrystalline glass is used as a glaze surface and is easier to compound with a substrate of the light wall materials, the appearance quality and the blank glaze bonding performance of the produced products both reach the industrial quality standard, and the problem of decoration integration of the light wall materials is solved.
Description
Technical Field
The invention relates to the technical field of production of light wall materials, in particular to microcrystalline glass suitable for producing light wall materials and a preparation method thereof.
Background
The light wall material is an assembly type module base material gradually derived along with the development of assembly type buildings at present, and is also a material which is developed in the utmost in China. The inorganic non-metal light wall material has high acid corrosion resistance, excellent heat insulating performance, non-inflammable and fire retardant performance, and may be used widely in assembled building. However, the existing light wall material is mainly produced by using mineral tailings, industrial solid wastes and ceramic waste residues as main raw materials, and the production process makes the glaze surface of the light wall material difficult to compound and the decoration integration difficult to realize. For this reason, we have developed a type of glass-ceramic suitable for use in the production of lightweight wall materials.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the microcrystalline glass suitable for producing the light wall material and the preparation method thereof, the microcrystalline glass can be used in the light wall material, the strength and the toughness of a product are increased, meanwhile, the microcrystalline glass serving as a glaze surface is easier to be compounded with a substrate of the light wall material, the appearance quality and the blank glaze bonding performance of the produced product both reach the industrial quality standard, and the problem of decoration integration of the light wall material is solved.
The technical scheme adopted by the invention is as follows: the microcrystalline glass suitable for producing light wall material consists of the following components in percentage by weight: SiO 22 56~72%、Al2O3 7~13%、CaO 8~15%、MgO 2~6%、Fe2O3 0~0.5%、TiO20~2%、K2O 0~3%、Na2O 2~6%、BaO 2~4%、B2O3 2~5%。
Further optimized, wherein K2O and Na2The total content of O is not higher than 6%.
Further optimized, wherein, SiO2And Al2O3The total content of (A) is 60-75%.
Further optimized, the microcrystalline glass contains the microcrystals of wollastonite crystals.
Further optimizing, raw materials used for preparing the microcrystalline glass comprise quartz, alumina, talcum, calcite, dolomite, basalt, potash feldspar, barium carbonate, borax, sodium nitrate, sodium carbonate and a clarifying agent.
Further optimized, wherein the clarifying agent is Sb2O3，Sb2O3The proportion of the content of (A) in the total raw materials is not more than 1.5%.
A preparation method of microcrystalline glass suitable for producing light wall materials comprises the following steps:
step one, weighing the weight of the raw materials according to the weight proportion, pouring the raw materials into a mixer, and uniformly mixing the raw materials to obtain a precursor glass raw material;
step two, putting the precursor glass raw material into a smelting furnace, melting and clarifying at high temperature, dissolving the precursor glass raw material into high-temperature glass stock solution, and removing bubbles and foreign matters in the high-temperature glass stock solution;
and step three, discharging the molten high-temperature glass liquid, and quenching the molten high-temperature glass liquid into 8-20-mesh microcrystalline frits by using cold water.
Further optimizing, in the raw materials added in the step one, BaO and B2O3、Al2O3Chemical raw materials are introduced, and the rest components are introduced from mineral raw materials.
And further optimizing, wherein in the second step, the melting temperature is 1550-1600 ℃ and the time is 2-4 hours.
And further optimizing, wherein in the third step, the cold water is circulating water with the temperature of 20-40 ℃.
The invention has the beneficial effects that:
the microcrystalline glass is suitable for producing light wall materials, 10-30% of auxiliary materials are added, so that the strength and toughness of the plate can be effectively improved, a foam stabilizing effect is achieved, and the foam holes of the plate are uniform.
The microcrystalline glass can solve the decoration integration problem of the light wall material, has a lower thermal expansion coefficient and certain melting characteristics (such as low initial melting point, good melt fluidity, wide sintering range and the like), is easier to compound with the light wall material, and has the advantages of less defects and high yield of the obtained product.
The invention mainly uses quartz, calcite, potash-soda feldspar and alumina to carry out reasonable proportioning to achieve the chemical composition of wollastonite crystalline phase, uses borax, sodium carbonate and sodium nitrate as solvents to reduce the melting temperature, and adds mineralizers such as barium carbonate, talc and the like to promote crystallization.
And fourthly, the raw materials adopted by the invention are mostly mineral raw materials, the using amount of chemical raw materials is less than 15%, and the method is favorable for controlling the cost of industrial production. Compared with the method for synthesizing wollastonite microcrystalline glass by using chemical raw materials, the method has the advantage that the cost is reduced by 60 percent.
Fifthly, the porosity of the microcrystalline glass prepared by the method is less than 0.3 percent, and is lower than that of the microcrystalline glass prepared by chemical materials.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 scope of the present invention.
The microcrystalline glass suitable for producing light wall material consists of the following components in percentage by weight: SiO 2256~72%、Al2O3 7~13%、CaO 8~15%、MgO 2~6%、Fe2O3 0~0.5%、TiO2 0~2%、K2O 0~3%、Na2O 2~6%、BaO 2~4%、B2O3 2~5%。
In this scheme, it should be noted that: wherein, K2O and Na2O plays a role of fluxing, but the addition of the two in a total amount which is too high can lead to too large expansion coefficient of the glass ceramics, and the following components are preferably used: cosolvent K2O and Na2The total content of O is not higher than 6 percent; furthermore, SiO2And Al2O3The silicate glass forms a skeleton structure, the adding proportion needs to be accurately controlled to form wollastonite crystal form more easily, and the following components are preferably used: SiO 22And Al2O3The total content of (A) is 60-75%.
In the scheme, the prepared microcrystalline glass contains microcrystals of wollastonite crystals.
In the scheme, raw materials for preparing the microcrystalline glass comprise quartz, alumina, talcum, calcite, dolomite, basalt, potash feldspar, barium carbonate, borax, sodium nitrate, sodium carbonate and a clarifying agent. Wherein the clarifying agent is Sb2O3，Sb2O3The proportion of the content of (A) in the total raw materials is not more than 1.5%.
A preparation method of microcrystalline glass suitable for producing light wall materials comprises the following steps:
the first step,Weighing the raw materials according to the weight ratio, pouring the raw materials into a mixer, and uniformly mixing the raw materials to obtain a precursor glass raw material; in the raw materials added in the step, BaO and B2O3、Al2O3Introducing chemical raw materials, and introducing the rest components from mineral raw materials; in the step, the raw materials are weighed according to the weight proportion, and the following are required to be mentioned: the addition proportion of each raw material can be calculated by the technicians in the field according to the percentage composition of each component in the microcrystalline glass;
step two, putting the precursor glass raw material into a smelting furnace, melting and clarifying at high temperature, dissolving the precursor glass raw material into high-temperature glass stock solution, and removing bubbles and foreign matters in the high-temperature glass stock solution; wherein the melting temperature is 1550-1600 ℃ and the time is 2-4 hours;
discharging the molten high-temperature glass liquid, and quenching the molten high-temperature glass liquid into 8-20-mesh microcrystalline frits by using cold water, wherein the cold water is circulating water with the temperature of 20-40 ℃.
Examples 1,
A preparation method of microcrystalline glass suitable for producing light wall materials comprises the following steps:
(1) 56 parts of quartz, 4 parts of borax, 1 part of sodium nitrate, 4 parts of soda ash, 4 parts of barium carbonate, 12 parts of albite, 21 parts of calcite, 8 parts of talcum and 0.7 part of clarifier are fully mixed to serve as a precursor glass raw material.
(2) And then putting the prepared precursor glass raw material into a high-temperature smelting furnace, and melting for 3 hours at the temperature of 1590 ℃.
(3) After the smelting is finished, discharging the smelted glass liquid into a container filled with cold water at the temperature of 30 ℃, and continuously keeping the water temperature of the smelted glass liquid not to exceed 40 ℃ by using circulating water so as to ensure the quality of water quenching;
(4) the microcrystalline glass prepared by the embodiment comprises the following components in percentage by weight: SiO 22 65.37%、Al2O3 7.6%、CaO 12.5%、MgO 3.82%、Fe2O3 0.07%、TiO2 0.04%、K2O 0.7%、Na2O 4.6%、BaO3.1%、B2O32.2%。
Examples 2,
A preparation method of microcrystalline glass suitable for producing light wall materials comprises the following steps:
(1) 46 parts of potash albite, 3 parts of borax, 0.8 part of sodium nitrate, 5 parts of sodium carbonate, 5 parts of barium carbonate, 3 parts of alumina, 10 parts of quartz, 16 parts of calcite, 12 parts of talcum and 1.2 parts of clarifying agent are fully mixed to serve as a precursor glass raw material.
(2) And then the prepared precursor glass raw material is put into a high-temperature smelting furnace and is melted for 3 hours at the temperature of 1560 ℃.
(3) After the smelting is finished, discharging the smelted glass liquid into a container filled with cold water at the temperature of 30 ℃, and continuously keeping the water temperature of the smelted glass liquid not to exceed 40 ℃ by using circulating water so as to ensure the quality of water quenching;
(4) the microcrystalline glass prepared by the embodiment comprises the following components in percentage by weight:
SiO2 60.72%、Al2O3 10.89%、CaO 13.5%、MgO 4.17%、Fe2O3 0.04%、TiO2 0.05%、K2O 1.6%、Na2O 3.9%、BaO3.1%、B2O3 2.03%。
examples 3,
A preparation method of microcrystalline glass suitable for producing light wall materials comprises the following steps:
(1) 41 parts of quartz, 16 parts of albite, 3 parts of borax, 0.8 part of sodium nitrate, 5 parts of soda ash, 5 parts of barium carbonate, 3 parts of alumina, 20 parts of calcite, 7 parts of talcum and 1.0 part of clarifying agent are fully mixed to serve as a precursor glass raw material.
(2) And then putting the prepared precursor glass raw material into a high-temperature smelting furnace, and melting for 3 hours at the temperature of 1590 ℃.
(3) And after the smelting is finished, discharging the smelted glass liquid into a container filled with cold water at the temperature of 30 ℃, and continuously keeping the water temperature of the smelted glass liquid not to exceed 40 ℃ by using circulating water so as to ensure the quality of water quenching.
(4) Microcrystals obtained in this exampleThe glass comprises the following components in percentage by weight: SiO 2262.52%、Al2O3 9.68%、CaO 14.62%、MgO 2.66%、Fe2O3 0.07%、TiO2 0.04%、K2O 0.4%、Na2O 4.71%、BaO3.1%、B2O32.2%。
The above disclosure is only intended to illustrate a few specific embodiments of the present application, and should not be construed as limiting the scope of the invention. Any modification and decoration made by those skilled in the art on the basis of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The microcrystalline glass suitable for producing the light wall material is characterized in that: the microcrystalline glass comprises the following components in percentage by weight: SiO 22 56~72%、Al2O3 7~13%、CaO 8~15%、MgO 2~6%、Fe2O3 0~0.5%、TiO2 0~2%、K2O 0~3%、Na2O 2~6%、BaO 2~4%、B2O3 2~5%。
2. The microcrystalline glass suitable for producing the light-weight wall material according to claim 1, wherein: wherein, K2O and Na2The total content of O is not higher than 6%.
3. The microcrystalline glass suitable for producing the light-weight wall material according to claim 1, wherein: wherein, SiO2And Al2O3The total content of (A) is 60-75%.
4. The microcrystalline glass suitable for producing the light-weight wall material according to claim 1, wherein: the microcrystalline glass contains microcrystals of wollastonite crystals.
5. The microcrystalline glass suitable for producing the light-weight wall material according to claim 1, wherein: the raw materials used for preparing the microcrystalline glass comprise quartz, alumina, talcum, calcite, dolomite, basalt, potash albite, barium carbonate, borax, sodium nitrate, soda ash and a clarifying agent.
6. The microcrystalline glass suitable for producing the light-weight wall material according to claim 5, wherein: wherein the clarifying agent is Sb2O3，Sb2O3The proportion of the content of (A) in the total raw materials is not more than 1.5%.
7. The method for preparing the microcrystalline glass suitable for producing the light-weight wall material according to any one of claims 1 to 6, wherein the method comprises the following steps: the method comprises the following steps:
step one, weighing the weight of the raw materials according to the weight proportion, pouring the raw materials into a mixer, and uniformly mixing the raw materials to obtain a precursor glass raw material;
step two, putting the precursor glass raw material into a smelting furnace, melting and clarifying at high temperature, dissolving the precursor glass raw material into high-temperature glass stock solution, and removing bubbles and foreign matters in the high-temperature glass stock solution;
and step three, discharging the molten high-temperature glass liquid, and quenching the molten high-temperature glass liquid into 8-20-mesh microcrystalline frits by using cold water.
8. The preparation method of the microcrystalline glass suitable for producing the light-weight wall material according to claim 7, wherein the preparation method comprises the following steps: in the raw materials added in the step one, BaO and B2O3、Al2O3Chemical raw materials are introduced, and the rest components are introduced from mineral raw materials.
9. The preparation method of the microcrystalline glass suitable for producing the light-weight wall material according to claim 7, wherein the preparation method comprises the following steps: in the second step, the melting temperature is 1550-1600 ℃ and the time is 2-4 hours.
10. The preparation method of the microcrystalline glass suitable for producing the light-weight wall material according to claim 7, wherein the preparation method comprises the following steps: in the third step, the cold water is circulating water with the temperature of 20-40 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115784616A (en) * | 2022-11-15 | 2023-03-14 | 常熟佳合显示科技有限公司 | MAS microcrystalline glass and preparation method thereof |
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| CN105601115A (en) * | 2014-11-19 | 2016-05-25 | 成都光明光电股份有限公司 | Microcrystalline glass by taking spinel as main component and preparation method thereof |
| CN111453995A (en) * | 2014-11-19 | 2020-07-28 | 成都光明光电股份有限公司 | Microcrystalline glass mainly containing spinel and preparation method thereof |
| CN108821598A (en) * | 2015-12-03 | 2018-11-16 | 成都光明光电有限责任公司 | Devitrified glass and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115784616A (en) * | 2022-11-15 | 2023-03-14 | 常熟佳合显示科技有限公司 | MAS microcrystalline glass and preparation method thereof |
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