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Method for manufacturing composite multi-stage fused quartz powder ceramic crucible

A technology of fused silica powder and fused silica, which is applied in the field of preparation of fused silica ceramic crucibles for polysilicon casting, can solve the problems of uneven composition, long process cycle, multiple sets of plaster molds, etc., to enhance the performance of the network structure and improve the dispersion , The effect of reducing the thermal expansion coefficient

Inactive Publication Date: 2009-11-18
王迎奎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly relies on the water absorption precipitation method to realize the accumulation and molding of particles, so the prepared ceramic crucible usually has problems such as the thickness of the particles in the direction of wall thickness and height, uneven composition, long process cycle, and multiple sets of plaster molds.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The first step: mixing multi-stage powder

[0060] Dosing according to 50Kg powder, weighing 5Kg of the first-grade fused silica powder with a particle size of 0.1μm-1.0μm, 30Kg of the second-grade fused silica powder with a particle size of 1.0μm-10μm, and the third-grade fused silica powder with a particle size of 10μm-50μm Grade fused silica powder 15Kg, put into the mixing machine for dry mixing, the mixing time is 30h.

[0061] Step 2: Configure the master mix

[0062] (1) Dissolve monomer (acrylamide) and crosslinking agent (N, N-methylenebisacrylamide) in deionized water, wherein the concentration of monomer is 2.0wt%; the ratio of monomer to crosslinking agent For: 10:1;

[0063] (2) Add 0.5wt% dispersant (one or more combinations of polyacrylic acid, polymethacrylic acid ammonium, acrylic acid-acrylate binary copolymer, ammonium citrate, etc.) to the premix;

[0064] (3) Add lactic acid or acetic acid to the above liquid to adjust the pH value of the liquid ...

Embodiment 2

[0080] The first step: configure composite multi-stage fused silica powder

[0081] Dosing according to 50Kg powder, weighing 7Kg of the first-grade fused silica powder with a particle size of 0.1μm-1.0μm, 40Kg of the second-grade fused silica powder with a particle size of 1.0μm-10μm, and the third-grade fused silica powder with a particle size of 10μm-50μm Grade fused silica powder 3Kg, put into the mixing machine for dry mixing, the mixing time is 1-50h.

[0082] Step 2: Configure the master mix

[0083] (1) monomer (methacrylamide), crosslinking agent (N, N-methylenebisacrylamide) are dissolved in deionized water, wherein the concentration of monomer is 5wt%; monomer and crosslinking agent The ratio is: 15:1;

[0084] (2) Add 1.0wt% dispersant (acrylic acid-acrylate binary copolymer) to the premix;

[0085] (3) Add lactic acid or acetic acid to the above liquid to adjust the pH value of the liquid to 3 in order to achieve better dispersion effect.

[0086] Step 3: Prep...

Embodiment 3

[0101] The first step: mixing multi-stage powder

[0102] Dosing according to 50Kg powder, weighing 5Kg of the first-grade fused silica powder with a particle size of 0.1μm-1.0μm, 30Kg of the second-grade fused silica powder with a particle size of 1.0μm-10μm, and the third-grade fused silica powder with a particle size of 10μm-50μm Grade fused silica powder 15Kg, put into the mixing machine for dry mixing, the mixing time is 30h.

[0103] Step 2: Configure the master mix

[0104] (1) Dissolve monomer (acrylamide) and crosslinking agent (N, N-methylenebisacrylamide) in deionized water, wherein the concentration of monomer is 2.0wt%; the ratio of monomer to crosslinking agent For: 10:1;

[0105] (2) Add 0.5wt% dispersant (one or more combinations of polyacrylic acid, polymethacrylic acid ammonium, acrylic acid-acrylate binary copolymer, ammonium citrate, etc.) to the premix;

[0106] (3) Add lactic acid or acetic acid to the above liquid to adjust the pH value of the liquid to...

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Abstract

The invention belongs to the field of inorganic non-metallic materials, and relates to the improvement of technology for preparing a fused quartz ceramic crucible. The method for preparing the fused quartz ceramic crucible comprises the steps of mixing-pulping-adding catalyst and initiator-gelatinating-drying- sintering. In the method, multi-stage fused quartz powder is taken as a raw material to prepare the quartz ceramic crucible by gel casting. The quartz ceramic crucible can realize even mixing of multiple dimensioned materials; furthermore, the prepared crucible has uniform structure, controllable porosity as well as excellent thermal shock resistance and high temperature resistance and can meet the requirements of technique and production of polysilicon. In addition, the technique has simple process and no environmental pollution, and is suitable for commercial process.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials and relates to the improvement of the preparation technology of the fused silica ceramic crucible for polysilicon casting. Background technique [0002] As we all know, the power supply in the world is becoming increasingly tense, and the application of photovoltaic technology can effectively alleviate this situation. Photovoltaic power generation mainly includes single crystal and polycrystalline cell technology. Compared with single crystal, polycrystalline photovoltaic has the advantages of low energy consumption and high efficiency; 6 to 7 times of that, so polycrystalline has been widely used in recent years. There is an electric arc method to produce quartz crucible for single crystal silicon drawing. "Quartz Glass" ISBN 978-7-025-9751-1 published by Chemical Industry Press, its fifth chapter discloses the arc method to produce quartz crucible technology. The 18-inch quartz ...

Claims

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Application Information

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IPC IPC(8): C03B20/00C01B33/021C30B15/10
CPCC03B19/066Y02P40/57
Inventor 王迎祥高庆昌杜欣王迎奎
Owner 王迎奎
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