Method for preparing silicon nitride bonding silicon carbide foamed ceramics

A foamed ceramic and silicon carbide technology, which is applied in the field of silicon nitride combined with silicon carbide foamed ceramics, can solve the problems of continuous casting of large-scale special steel castings, poor thermal shock resistance, and low operating temperature, and achieves light weight, high resistance to Excellent thermal shock properties and improved strength

Inactive Publication Date: 2015-01-28
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used alumina foam ceramics and silicon carbide foam ceramics generally have problems such as low service temperature and poor thermal shock resistance, which cannot meet the needs of continuous casting of large special steel castings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Mix SiC, silicon micropowder, and phenolic resin in a weight ratio of 40:40:20 and add 0.1wt% hydroxypropyl methylcellulose solution 40wt% to make a ceramic slurry, and then impregnate the ceramic slurry On polyurethane foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 20 hours, keep at 1450°C for 5 hours, and then hold at a temperature of 1700°C for 20 minutes to make silicon nitride bonded silicon carbide foam ceramics.

[0011] The purity of the batching raw materials used in the experiment is industrial pure.

Embodiment 2

[0013] Mix SiC, silicon micropowder, and phenolic resin in a weight ratio of 60:25:15 and add 0.2wt% hydroxypropyl methylcellulose solution 50wt% to make a ceramic slurry, and then impregnate the ceramic slurry On polyurethane foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 60 hours, keep at 1450°C for 8 hours, and then hold at a temperature of 1730°C for 70 minutes to make silicon nitride bonded silicon carbide foam ceramics.

[0014] The purity of the batching raw materials used in the experiment is industrial pure.

Embodiment 3

[0016] Mix SiC, silicon micropowder, and phenolic resin at a weight ratio of 88:10:2 and add 0.3wt% hydroxypropyl methylcellulose solution 60wt% to make a ceramic slurry, and then impregnate the ceramic slurry On polyurethane foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 100 hours, keep at 1450°C for 10 hours, and then hold at a temperature of 1750°C for 120 minutes to make silicon nitride bonded silicon carbide foam ceramics.

[0017] The purity of the batching raw materials used in the experiment is industrial pure.

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PUM

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Abstract

The invention discloses a method for preparing silicon nitride bonding silicon carbide foamed ceramics. The method is characterized by comprising the following steps: uniformly mixing SiC, silica powder, a phenolic resin and hydroxypropyl methyl cellulose solution so as to prepare ceramic slurry; dipping the ceramic slurry on polyurethane foam, drying, and firing in a nitrogen atmosphere, thereby obtaining the silicon nitride bonding silicon carbide foamed ceramics. The silicon nitride bonding silicon carbide foamed ceramics prepared by the method are uniform in microstructure, high in strength and uniform in pore size, and residues of carbon and free silicon are avoided, so that the strength, high temperature resistance and thermal shock resistance of the ceramics can be greatly improved.

Description

technical field [0001] The invention relates to a silicon nitride bonded silicon carbide foam ceramic, which belongs to the technical field of porous ceramic preparation. Background technique [0002] Silicon nitride combined with silicon carbide foam ceramics is a structural ceramic material with low expansion, corrosion resistance, high strength and high temperature resistance. Silicon nitride combined with silicon carbide foam ceramics are mainly used as large-scale molten steel filter elements in steel casting and other industries for large-scale special steel castings. The currently used alumina foam ceramics and silicon carbide foam ceramics generally have problems such as low service temperature and poor thermal shock resistance, which cannot meet the needs of continuous casting of large special steel castings. Contents of the invention [0003] The object of the present invention is to provide a kind of preparation method of silicon nitride bonded silicon carbide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/565
Inventor 唐竹兴田帅
Owner SHANDONG UNIV OF TECH
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