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Reactively sintered silicon carbide ceramic and production process

A sintered silicon carbide, production process technology, applied in the field of reaction sintered silicon carbide ceramics, can solve the problems of unstable quality, large product size deformation rate, no production process of reaction sintered silicon carbide ceramics, etc., and achieve good wear resistance , strong oxidation resistance and high thermal conductivity

Inactive Publication Date: 2009-08-19
WEIFANG HUAMEI FINE TECHN CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no mature production process of reaction sintered silicon carbide ceramics has been found so far, and the quality of the reaction sintered silicon carbide ceramics produced is unstable, and the dimensional deformation rate of the product is relatively large

Method used

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  • Reactively sintered silicon carbide ceramic and production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A production process of reaction sintered silicon carbide ceramics, comprising the steps of:

[0021] (1) Ingredients

[0022] Dry material: 5 parts by weight of SiC powder with a particle size of 10-40 μm, 2 parts by weight of SiC powder with a particle size of 0.1-1 μm, 0.5 part by weight of metallurgical carbon black powder and 0.3 part by weight of graphite powder, wherein the purity of the two SiC powders is 99.6 %, carbon black powder purity 99.7%, graphite powder purity 99.9%;

[0023] Concentration is 0.1 weight part of polyvinyl alcohol liquid of 60%;

[0024] Add the above materials into 10% distilled water relative to the weight of the dry materials and stir evenly to form a slurry;

[0025] (2) Grouting molding Put the mixed slurry into a vacuum pressure tank for vacuum treatment. After the vacuum degree reaches -0.08MPa, inject the slurry into a plaster mold for molding, and open the mold after 0.5 hours to obtain a green body;

[0026] (3) Drying Put th...

Embodiment 2

[0031] A production process of reaction sintered silicon carbide ceramics, comprising the steps of:

[0032] (1) Ingredients

[0033] Dry material: 8 parts by weight of SiC powder with a particle size of 40-60 μm, 3 parts by weight of SiC powder with a particle size of 1-5 μm, 1 part by weight of metallurgical carbon black powder and 0.8 parts by weight of graphite powder, and the purity of the two SiC powders is 99.8 %, carbon black powder purity 99.8%, graphite powder purity 99.9%;

[0034] Concentration is 0.3 parts by weight of carboxymethylcellulose of 60%;

[0035] Add the above materials into 30% distilled water relative to the weight of dry materials and stir evenly to form a slurry;

[0036] (2) Grouting molding Put the mixed slurry into a vacuum pressure tank for vacuum treatment. After the vacuum degree reaches -0.08MPa, inject the slurry into a plaster mold for molding, and open the mold to obtain a green body after 12 hours;

[0037] (3) Drying Put the green bo...

Embodiment 3

[0042] A production process of reaction sintered silicon carbide ceramics, comprising the steps of:

[0043] (1) Ingredients

[0044] Dry material: 6.5 parts by weight of SiC powder with a particle size of 60-90 μm, 2.5 parts by weight of SiC powder with a particle size of 5-10 μm, 0.8 part by weight of metallurgical carbon black powder and 0.5 part by weight of graphite powder, both of which have a purity of 99.8% , carbon black powder purity 99.8%, graphite powder purity 99.9%;

[0045] Concentration is 0.2 weight part of carboxymethyl cellulose of 60%;

[0046] Add the above materials into water with a relative dry weight of 20% and stir evenly to form a slurry;

[0047] (2) Grouting molding Put the mixed slurry into a vacuum pressure tank for vacuum treatment. After the vacuum degree reaches -0.08MPa, inject the slurry into a plaster mold for molding, and open the mold after 5 hours to obtain a green body;

[0048] (3) Drying Put the green body into the drying room, slo...

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Abstract

The invention discloses a reaction sintering silicon carbide ceramics and a manufacturing technique thereof. The materials of the ceramics comprise: 5-8 parts by weight of SiC powder with a granularity of 10-90 mum, 2-3 parts by weight of SiC powder with a granularity of 0.1-10mum, 0.5-1 part by weight of carbon black powder, 0.3-0.8 part by weight of graphite powder and 0.1-0.3 part by weight of polyvinyl alcohol or carboxymethyl cellulose liquid; the silicon carbide ceramics is manufactured after the pulping of materials, slip casting, drying, vacuum sintering and sand removing and oxidization. The manufacturing technique of the invention is mature and reliable, the silicon carbide ceramics of the invention is fine in product performance and stable in quality, and hardness, temperature resistance, wear resistance and corrosion resistance thereof all reach the standard of international reaction sintering silicon carbide ceramics. In addition, the ceramics of the invention is widely applied to fields such as ceramics kiln furniture, desulphurization nozzles, metallurgy, chemical engineering and the like, and the size deformation rate of the product is less than 0.1%.

Description

technical field [0001] The invention relates to a technology of reaction sintered silicon carbide ceramics, in particular to reaction sintered silicon carbide ceramics used in smelting furnace linings, rocket engine tail nozzles used in space technology, various kiln furniture, environmental protection desulfurization nozzles, etc. Production Process. Background technique [0002] Silicon carbide ceramics have excellent characteristics such as high mechanical strength, high temperature resistance, strong oxidation resistance, good thermal stability, high thermal conductivity, good wear resistance, good chemical corrosion resistance, high hardness, and good thermal shock resistance. The basic principle of reaction sintered silicon carbide ceramics is: reactive liquid silicon or gaseous silicon, infiltrated into a carbon-containing porous ceramic green body under capillary action, and reacts with the carbon in it to form silicon carbide. Combined with the original silicon car...

Claims

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Application Information

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IPC IPC(8): C04B35/573C04B35/622
Inventor 王明峰
Owner WEIFANG HUAMEI FINE TECHN CERAMICS
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