Method for promoting surface crystallization of glass

A glass surface and glass technology, which is applied in the field of promoting glass surface crystallization, can solve the problems of unsuitable and invisible bulk glass, and achieve the effects of shortening heat treatment time, remarkable effect and simple and easy process.

Inactive Publication Date: 2013-01-02
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Surface devitrification has a significant response to the surface area of ​​the glass. Increasing the surface area of ​​the glass can significantly promote the surface devitrification. For example, the traditional method is to reduce the particle

Method used

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  • Method for promoting surface crystallization of glass
  • Method for promoting surface crystallization of glass
  • Method for promoting surface crystallization of glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The glass composition is Li 2 O 8%, Fe 2 o 3 29%, P 2 o 5 63%, the preparation method is as follows:

[0030] Weigh the raw materials according to the above mass percentages and mix them evenly, put the mixture into a quartz crucible and melt it in a silicon carbide rod electric furnace at 1200 °C for 1 hour; pour the glass liquid into a preheated mold, and quickly Move it to a muffle furnace that has been heated to 300-400 ° C, keep it warm for 1 hour and anneal. Turn off the muffle furnace and cool down to room temperature. After annealing, the small glass sample was heated at a rate of 5 °C / min to the crystal nucleus formation temperature of 440 °C and kept for 2 hours; then at the same rate of heating to the crystallization peak temperature of 565 °C and kept for 2 hours. After heat treatment, the thickness of the crystallization layer was analyzed by optical microscope, and the thickness of the crystallization layer was 361.6 μm, and the main crystal phase ...

Embodiment 2

[0032] The glass composition is Li 2 O 8%, Fe 2 o 3 29%, P 2 o 5 63%, plus the crystallization promoting agent Cr 2 o 3 5%. The preparation method is as follows:

[0033] Weigh the raw materials according to the above mass percentages and mix them evenly, put the mixture into a quartz crucible and melt it in a silicon carbide rod electric furnace at 1200 °C for 1 hour; pour the glass liquid into a preheated mold, and quickly Move it to a muffle furnace that has been heated to 300-400 ° C, keep it warm for 1 hour and anneal. Turn off the muffle furnace and cool down to room temperature. After annealing, the small glass sample was heated at a rate of 5 °C / min to the crystal nucleus formation temperature of 490 °C and kept for 2 hours; then at the same rate of heating to the crystallization peak temperature of 620 °C and kept for 2 hours. The thickness of the crystallization layer of the sample after heat treatment was analyzed by optical microscope to be 1081.3 μm, an...

Embodiment 3

[0035] The glass composition is Li 2 O 8%, Fe 2 o 3 29%, P 2 o 5 63%, plus crystallization promoting agent TiO 2 2%, Cr 2 o 3 3%. The preparation method is as follows:

[0036] Weigh the raw materials according to the above mass percentages and mix them evenly, put the mixture into a quartz crucible and melt it in a silicon carbide rod electric furnace at 1200 °C for 1 hour; pour the glass liquid into a preheated mold, and quickly Move it to a muffle furnace that has been heated to 300-400 ° C, keep it warm for 1 hour and anneal. Turn off the muffle furnace and cool down to room temperature. After annealing, the small glass sample was heated at a rate of 5 °C / min to the crystal nucleus formation temperature of 480 °C and kept for 2 hours; then at the same rate of heating to the crystallization peak temperature of 620 °C and kept for 2 hours. After heat treatment, the thickness of the crystallization layer was analyzed by optical microscope to be 2047.6 μm, and the ...

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Abstract

The invention discloses a method for promoting the surface crystallization of glass, which mainly comprises the following step of: introducing a crystallization accelerant into glass when the glass is made so as to promote the surface crystallization of the glass. The crystallization accelerant comprises one or a mixture of titanium oxide and chromium sesquioxide. The surface crystallization of the glass is promoted by the simple method. The surface crystallization speed of the glass or the content of a crystal phase in a surface crystallized layer can be raised by adding glass nucleating agents (TiO2 and Cr2O3) used in traditional overall crystallization without breaking the glass. The process is simple and feasible, and surface crystallization effect is remarkable. Besides, the crystallized glass with different crystallized layer thicknesses and different crystal contents can be obtained through the adjustment of the use quantities of the TiO2 and the Cr2O3, and various requirements are met.

Description

technical field [0001] The invention relates to a method for promoting crystallization on a glass surface, which belongs to the technical field of special glass materials. Background technique [0002] Because the internal energy of glass is higher than that of the corresponding crystalline state, glass has a tendency of spontaneous crystallization, but because of its high viscosity, it can be in a metastable state for a long time. Glass crystallization can be induced by artificial induction, and glass crystallization can be controlled to improve glass performance, and can also produce glass ceramics to expand the application field of glass. Useful glass-ceramics are obtained by first preparing the glass and then controlling the crystallization. The crystallization of the glass generally includes two forms of overall crystallization and surface crystallization. In the case of overall crystallization, crystallization is crystallization from all parts of the glass at the same...

Claims

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Application Information

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IPC IPC(8): C03C10/02C03B32/02
Inventor 刘世权刘华丽王涛王迎辉杨瑞娟
Owner UNIV OF JINAN
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