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Colorless transparent cordierite microcrystalline glass and preparation method thereof

A technology of glass-ceramic and cordierite, which is applied in the field of colorless and transparent cordierite glass-ceramic and its preparation, can solve the problems of lowering of comprehensive performance, increase of glass melting temperature, change of main crystal phase of glass-ceramic, and the like. The effect of reducing the melting temperature, increasing the thermal expansion coefficient, and good mechanical strength

Active Publication Date: 2020-06-23
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the cordierite glass-ceramic contains a crystal nucleating agent, which causes the glass to be colored, the glass melting temperature to increase, the main crystal phase of the glass-ceramic to change, and the overall performance to be reduced. Thereby providing a colorless transparent cordierite glass-ceramics

Method used

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  • Colorless transparent cordierite microcrystalline glass and preparation method thereof
  • Colorless transparent cordierite microcrystalline glass and preparation method thereof
  • Colorless transparent cordierite microcrystalline glass and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Magnesium carbonate is used as MgO source, alumina is Al 2 o 3 source, quartz as SiO 2 source, boric acid as B 2 o 3 Source, according to the glass-ceramic molar composition MgO 15.4%, Al 2 o 3 15.4%, SiO 2 65.4%, B 2 o 3 3.8% Calculate the amount of magnesium carbonate, aluminum oxide, quartz and boric acid used. The magnesium carbonate, aluminum oxide, quartz and boric acid are ball milled with ethanol as the medium and dried through an 80-mesh sieve to obtain the batch material. Put the batch material into corundum In the crucible, place it in a silicon-molybdenum rod electric furnace for melting at 1580°C for 3 hours, pour the melted glass melt into a steel mold previously heated to 600°C for molding, and quickly place it in an annealing furnace at 680°C for 5 hours. After cooling to room temperature the base glass was obtained.

[0038] (2) After the base glass is heat-treated according to a certain heat treatment system, it is cooled to room temper...

Embodiment 2

[0045] (1) Use magnesium oxide as the source of MgO and alumina as Al 2 o 3 source, quartz as SiO 2 source, boric acid as B 2 o 3 Source, according to the glass-ceramic molar composition MgO 18%, Al 2 o 3 16%, SiO 2 62.5%, B 2 o 3 3.5% Calculate the amount of magnesia, alumina, quartz and boric acid used, ball mill magnesia, alumina, quartz and boric acid with ethanol as the medium and pass through an 80-mesh sieve to obtain the batch material, and put the batch material into corundum In the crucible, place it in a silicon-molybdenum rod electric furnace for melting at 1550°C for 5 hours, pour the melted glass melt into a steel mold previously heated to 600°C for molding, and quickly place it in an annealing furnace at 650°C for annealing for 3 hours. After cooling to room temperature the base glass was obtained.

[0046] (2) After the base glass is heat-treated according to a certain heat treatment system, it is cooled to room temperature to obtain a colorless tra...

Embodiment 3

[0051] (1) Use magnesite as MgO source, alumina as Al 2 o 3 source, quartz as SiO 2 source, boric acid as B 2 o 3 Source, in accordance with the glass-ceramic molar composition MgO 15%, Al 2 o 3 10%, SiO 2 72%, B 2 o 3 3% to calculate the amount of magnesite, alumina, quartz and boric acid used, the magnesite, alumina, quartz and boric acid were ball milled with ethanol as the medium and passed through an 80-mesh sieve to dry to obtain the batch materials, and the batch materials were packed Put it into a corundum crucible, put it in a silicon-molybdenum rod electric furnace and melt it at 1650°C for 4 hours, pour the melted glass melt into a steel mold heated to 600°C beforehand, and quickly place it in an annealing furnace at 700°C for annealing After 2h, the base glass was obtained after cooling to room temperature.

[0052] (2) After the base glass is heat-treated according to a certain heat treatment system, it is cooled to room temperature to obtain a colorle...

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Abstract

The invention relates to colorless transparent cordierite microcrystalline glass and a preparation method thereof, and the microcrystalline glass comprises the following components in percentage by mole: 15%-25% of MgO, 10%-20% of Al2O3, 62%-73% of SiO2 and 2%-6% of B2O3. The preparation method comprises the following steps: carrying out phase-splitting heat treatment on the base glass for many times, and then carrying out crystallization heat treatment. A large number of nucleation sites are formed in the base glass through multiple times of split-phase heat treatment, and crystal nucleuses grow into nanocrystals with small sizes in a controlled manner; therefore, high light transmittance and good mechanical strength of the microcrystalline glass are guaranteed, and the problems that a nucleating agent needs to be added in an existing cordierite transparent microcrystalline glass preparation process, and microcrystalline glass coloring, principal crystalline phase change, comprehensive performance reduction and the like are caused are solved. The microcrystalline glass obtained by the method belongs to a magnesium-aluminum-silicon system, alpha-cordierite is the only crystalline phase, and is colorless, transparent, high in bending strength, high in surface hardness and low in expansion coefficient.

Description

technical field [0001] The invention relates to the field of glass-ceramics, in particular to a colorless transparent cordierite glass-ceramics and a preparation method thereof. Background technique [0002] Low-expansion transparent glass-ceramics has excellent thermal properties, excellent optical properties and mechanical properties, making it widely used in high-end kitchen utensils, electrical and electronic, chemical and aerospace industries, and has been widely concerned by people. There are two main categories of research on low-expansion transparent glass-ceramics: one is based on Li 2 O-Al 2 o 3 -SiO 2 Glass-ceramics that precipitate β-quartz solid solution in the (LAS) system, and the other is based on MgO-Al 2 o 3 -SiO 2 Glass-ceramics with nano cordierite precipitated in (MAS) system. At present, most of the research at home and abroad is concentrated on the LAS system, but there are relatively few studies on the MAS system glass that can achieve low expa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/08C03B32/02
CPCC03B32/02C03C10/0045
Inventor 包镇红江伟辉苗立锋罗薇刘健敏梁健劳新斌吴倩徐荣
Owner JINGDEZHEN CERAMIC INSTITUTE
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