Silicon carbide powder and preparation method thereof

A technology of silicon carbide powder and silicon carbide, which is applied in the field of refractory materials, can solve the problems of poor thermal shock stability and low strength of silicon carbide plates, and achieve high thermal shock stability, improved thermal stability, and good dispersion.

Active Publication Date: 2019-11-22
唐山市瑞兆碳化硅制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, silicon carbide refractory materials such as silicon carbide plates are fired from silicon carbide powders. During the firing process, silicon carbide powders are prone to agglomeration, resulting in low strength and poor thermal shock stability of the obtained silicon carbide plates.

Method used

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  • Silicon carbide powder and preparation method thereof
  • Silicon carbide powder and preparation method thereof
  • Silicon carbide powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A silicon carbide powder, comprising the following components by weight:

[0036] 35 parts of silicon carbide coarse powder, 4 parts of silicon powder, 1 part of carbon powder, 2 parts of titanium dioxide, 1 part of zirconia, 2 parts of cage polysilsesquioxane, 0.5 part of molybdenum carbide, 0.5 part of silicon boride, erbium acetate 0.5 part, 0.5 part of yttrium oxide, 0.7 part of polyethylene glycol, 0.5 part of poloxamer, 0.3 part of sodium tripolyphosphate, 0.5 part of dispersant; wherein, the dispersant is lauryl glucoside and polyethyleneimine A mixture with a mass ratio of 2:1;

[0037] Among them, the particle size of silicon carbide coarse powder is 5-15 μm, and the oxygen content is 0.73wt%; the purity of silicon powder is ≥99.5%, and the particle size is 1-10 μm; the purity of carbon powder is ≥99.5%, and the particle size is 1-10 μm ; Cage polysilsesquioxane is aminopropyl isobutyl silsesquioxane;

[0038] Its preparation method comprises the following st...

Embodiment 2

[0046] A silicon carbide powder, comprising the following components by weight:

[0047] 60 parts of silicon carbide coarse powder, 15 parts of silicon powder, 5 parts of carbon powder, 7 parts of titanium dioxide, 5 parts of zirconia, 6 parts of cage polysilsesquioxane, 1 part of molybdenum carbide, 1 part of silicon boride, erbium acetate 1.5 parts, 1.5 parts of yttrium oxide, 3 parts of polyethylene glycol, 2 parts of poloxamer, 1 part of sodium tripolyphosphate, 2 parts of dispersant;

[0048] Among them, the dispersant is a mixture of dodecyl glucoside and polyethyleneimine with a mass ratio of 2:1; the particle size of the silicon carbide coarse powder is 5-15 μm, and the oxygen content is 0.73wt%; the purity of the silicon powder is ≥99.5 %, the particle size is 1-10 μm, the purity of the carbon powder is ≥99.5%, and the particle size is 1-10 μm;

[0049] Its preparation method is with embodiment 1.

Embodiment 3

[0051] A silicon carbide powder, comprising the following components by weight:

[0052] 43 parts of silicon carbide coarse powder, 7 parts of silicon powder, 2 parts of carbon powder, 4 parts of titanium dioxide, 2 parts of zirconia, 3 parts of cage polysilsesquioxane, 0.6 part of molybdenum carbide, 0.6 part of silicon boride, erbium acetate 0.8 part, 0.8 part of yttrium oxide, 1.2 part of polyethylene glycol, 0.8 part of poloxamer, 0.5 part of sodium tripolyphosphate, 1 part of dispersant;

[0053] Among them, the dispersant is a mixture of dodecyl glucoside and polyethyleneimine with a mass ratio of 2:1; the particle size of the silicon carbide coarse powder is 5-15 μm, and the oxygen content is 0.73wt%; the purity of the silicon powder is ≥99.5 %, the particle size is 1-10 μm, the purity of the carbon powder is ≥99.5%, and the particle size is 1-10 μm;

[0054] Its preparation method is with embodiment 1.

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Abstract

The invention belongs to the technical field of refractory materials, and provides silicon carbide powder and a preparation method thereof. The silicon carbide powder includes, by weight, 35-60 partsof silicon carbide coarse powder; 4-15 parts of silica fume, 1-5 parts of carbon powder, 2-7 parts of titanium dioxide, 1-5 parts of zirconium oxide, 2 to 6 parts of polyhedral oligomeric silsesquioxane, 0.5-1 part of molybdenum carbide, 0.5-1 part of silicon boride, 0.5-1.5 parts of erbium acetate, 0.5-1.5 parts of yttrium oxide, 0.7-3 parts of polyethylene glycol, 0.5-2 parts of poloxamer, 0.3-1part of sodium tripolyphosphate and 0.5-2 parts of a dispersing agent. In the preparation method, a step-by-step mixing and twice ball milling combined manner is adopted. Through the technical scheme, the problems of low strength and poor thermal shock stability of a silicon carbide plate caused by easy agglomeration when the silicon carbide plate is fired by the silicon carbide powder in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a silicon carbide powder and a preparation method thereof. Background technique [0002] With the rapid development of non-ferrous smelting technology and chemical industry in recent years, my country has successively built large-scale modern non-ferrous metal smelting kilns and large-scale chemical production bases, which also put forward strict requirements for refractory materials used in smelting kilns and chemical production. Since the high-temperature material will be in direct contact with the refractory material used as the lining, there are high requirements for the high temperature resistance, erosion resistance and thermal shock resistance of the refractory material. Because graphite can quickly conduct heat when the ambient temperature changes suddenly, reduce the internal temperature gradient of the material, reduce thermal stress, and protect the material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/565C04B35/626
CPCC04B35/66C04B35/565C04B35/62605C04B2235/422C04B2235/428C04B2235/3232C04B2235/3244C04B2235/3839C04B2235/3804C04B2235/3225
Inventor 孙瑞臣
Owner 唐山市瑞兆碳化硅制品有限公司
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