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Negative thermal expansion glass ceramic and preparation method thereof

A technology of glass-ceramic and negative thermal expansion, which is applied in the field of negative thermal expansion glass-ceramic and its preparation, and can solve problems such as difficulty in controlling large-scale overall crystallization, difficulty in ultra-low expansion glass-ceramic, and harsh melting process conditions. , to achieve the effect of improving electrical insulation performance, saving production time, increasing hardness and anti-wear performance

Inactive Publication Date: 2019-05-21
吴春燕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Many institutions and enterprises at home and abroad have done a lot of research on the composition, structure, performance, research status and development of negative thermal expansion glass-ceramics. It is difficult to control the overall crystallization of large sizes, so it is more difficult to prepare ultra-low expansion glass-ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Negative thermal expansion glass-ceramic raw material formula, according to the following percentage composition: 30% SiO2, 35% Al2O3, 5% Li2O, 2% B2O3, 2% mixture of Li2O and K2O, 2% mixture of MgO and CaO And 1.5% TiO2, 1% ZrO2, 2.5% P2O5 and 1% F. Then put all of them into a V-shaped stirrer and mix them thoroughly as solid glass raw materials; then put the prepared solid glass raw materials into an electric furnace or a crucible furnace, heat to make the temperature in the furnace 1800°C and keep it for more than 24 hours. Dissolve the solid glass raw material into a high-temperature glass stock solution, and remove the bubbles and foreign matter generated during the dissolution of the solid glass raw material; then make the melted high-temperature glass stock solution into a glass original sheet by float method or pressing method; finally, the prepared glass raw material The sheet is placed in a high-temperature furnace for heat treatment. The heat treatment proces...

Embodiment 2

[0020] The negative thermal expansion glass-ceramic raw material formula is composed according to the following percentages: 50% SiO2, 38% Al2O3, 7.5% Li2O, 6% B2O3, 3.5% mixture of Na2O and K2O, 6% mixture of SrO and CaO And 3% TiO2, 1.5% ZrO2, 4% P2O5 and 1.5% F. Then put all of them into a V-shape stirrer and mix them thoroughly as a solid glass raw material; then put the prepared solid glass raw material into an electric furnace or a crucible furnace, heat it so that the temperature in the furnace is 1900°C and keep it for more than 24 hours. Dissolve the solid glass raw material into a high-temperature glass stock solution, and remove the bubbles and foreign matter generated during the dissolution of the solid glass raw material; then make the melted high-temperature glass stock solution into a glass original sheet by float method or pressing method; finally, the prepared glass raw material The sheet is placed in a high-temperature furnace for heat treatment. The heat tre...

Embodiment 3

[0022] The negative thermal expansion glass-ceramic raw material formula is composed according to the following percentages: 80% SiO2, 40% Al2O3, 10% Li2O, 10% B2O3, 5% Cu2O and K2O mixture, 10% ZnO and CaO mixture And 5% TiO2, 3% ZrO2, 4% P2O5 and 3% F. Then put all of them into a V-shape stirrer and mix them thoroughly as a solid glass raw material; then put the prepared solid glass raw material into an electric furnace or a crucible furnace, heat it so that the temperature in the furnace is 2000°C and keep it for more than 24 hours. Dissolve the solid glass raw material into a high-temperature glass stock solution, and remove the bubbles and foreign matter generated during the dissolution of the solid glass raw material; then make the melted high-temperature glass stock solution into a glass original sheet by float method or pressing method; finally, the prepared glass raw material The sheet is placed in a high-temperature furnace for heat treatment. The heat treatment proc...

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Abstract

The invention discloses a negative thermal expansion glass ceramic. The negative thermal expansion glass ceramic is prepared from the following components: 30 to 80 weight percent of SiO2, 35 to 40 weight percent of Al2O3, 5 to 10 weight percent of Li2O, 2 to 10 weight percent of B2O3, 2 to 5 weight percent of R2O and 2 to 10 weight percent of RO, wherein R2O is one or more of Li2O, Na2O, K2O andCu2O; RO is one or more of MgO, CaO, SrO, BaO and ZnO. A preparation method comprises the following steps: firstly, measuring the weight of all needed raw materials and putting the raw materials intoa blender for fully stirring; then putting a stirred substance into a melting furnace, heating until the temperature exceeds 1800 DEG C and keeping for 24 hours or above; dissolving solid glass raw materials into a high temperature glass stock solution and preparing the stock solution into raw glass sheets through a floating or pressing method; putting the raw glass sheets into a high temperaturefurnace for heat treatment; generating a uniform negative expansion beta-quartz solid solution micro-crystal after the heat treatment is finished so as to obtain the glass ceramic meeting the requirements.

Description

technical field [0001] The invention relates to a negative thermal expansion glass-ceramic and a preparation method thereof. The negative thermal expansion glass-ceramic refers to a glass-ceramic whose linear expansion coefficient (αT) or volumetric expansion coefficient (βT) is a negative value within a certain temperature range. . According to its characteristics, it can be used in high-tech fields such as aerospace, optoelectronics, etc., to manufacture precision optical devices, etc., and has broad application prospects. Background technique [0002] Glass-ceramic is a specific composition glass with high chemical composition and melting requirements. After heat treatment at a certain temperature, it becomes a composite material with uniform distribution of microcrystals and glass phases, also known as ceramic glass. The distribution of the glass phase and the crystalline phase in the glass-ceramic varies with its proportion. When the proportion of the glass phase is la...

Claims

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Application Information

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IPC IPC(8): C03C10/00C03B32/02
Inventor 吴春燕
Owner 吴春燕
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