A kind of preparation method of silicon nitride bonded silicon carbide foam ceramics

A technology of foam ceramics and silicon carbide, which is applied in the field of silicon nitride combined with silicon carbide foam ceramics, can solve the problems of continuous casting of large special steel castings, poor thermal shock resistance, and low service temperature, etc. Excellent thermal shock performance and enhanced strength

Inactive Publication Date: 2016-02-24
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

A method for preparing silicon nitride-bonded silicon carbide foam ceramics, characterized in that: SiC, silicon micropowder, phenolic resin and hydroxypropyl methylcellulose solution are uniformly mixed to form a ceramic slurry, and then the ceramic slurry is impregnated in On the polyurethane foam, after drying, it is fired in a nitrogen atmosphere to form silicon nitride bonded silicon carbide foam ceramics. The silicon nitride bonded silicon carbide foam ceramic prepared by the invention has uniform microstructure, high strength and uniform pore size, avoids the residue of carbon and free silicon, and greatly improves its strength, high temperature resistance and thermal shock resistance.

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 Patents(China)
IPC IPC(8): C04B38/06C04B35/565
Inventor 唐竹兴田帅
Owner SHANDONG UNIV OF TECH
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