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Preparation method of silicon nitride and silicon carbide combined niobium carbide foamed ceramic

A foamed ceramic and silicon carbide technology, which is applied in the field of silicon carbide combined with niobium carbide foamed ceramics and silicon nitride, can solve the problems of continuous casting of large special steel castings, poor thermal shock resistance, and low operating temperature, and achieves a high weight. Light weight, excellent thermal shock resistance, 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 NbC, silicon powder, and phenolic resin in a weight ratio of 40:40:20 with an additional concentration of 0.1Nbt% hydroxypropyl methylcellulose solution 40Nbt% to make ceramic slurry, and then impregnate the ceramic slurry On the polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is 300℃~1450℃, the temperature is increased slowly for 20 hours, the temperature is kept at 1450℃ for 5 hours, and then the temperature is 1700℃ for 20 minutes to make a combination of silicon nitride and silicon carbide Niobium carbide foam ceramics.

[0011] The purity of the ingredients used in the experiment is industrial pure.

Embodiment 2

[0013] Mix NbC, silicon powder, and phenolic resin in a weight ratio of 60:25:15 with an additional concentration of 0.2Nbt% hydroxypropyl methylcellulose solution 50Nbt% to make ceramic slurry, and then impregnate the ceramic slurry On the polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is 300℃~1450℃, the temperature is increased slowly for 60 hours, the temperature is kept at 1450℃ for 8 hours, and then the temperature is 1730℃ for 70 minutes to make a combination of silicon nitride and silicon carbide Niobium carbide foam ceramics.

[0014] The purity of the ingredients used in the experiment is industrial pure.

Embodiment 3

[0016] Mix NbC, silicon powder, and phenolic resin in a weight ratio of 88:10:2 with an additional concentration of 0.3Nbt% hydroxypropyl methylcellulose solution 60Nbt% to make ceramic slurry, and then impregnate the ceramic slurry On the polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is 300℃~1450℃, the temperature is increased slowly for 100 hours, the temperature is kept at 1450℃ for 10 hours, and then the temperature is 1750℃ for 120 minutes to make a combination of silicon nitride and silicon carbide Niobium carbide foam ceramics.

[0017] The purity of the ingredients used in the experiment is industrial pure.

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PUM

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Abstract

The invention discloses a preparation method of silicon nitride and silicon carbide combined niobium carbide foamed ceramic. The preparation method is characterized by comprising the steps of uniformly mixing NbC, silica micro-powder, phenolic resin and a hydroxypropyl methyl cellulose solution to form ceramic slurry, immersing polyurethane foam in the ceramic slurry, drying, and firing in an nitrogen atmosphere to obtain the silicon nitride and silicon carbide combined niobium carbide foamed ceramic. The silicon nitride and silicon carbide combined niobium carbide foamed ceramic has a uniform microscopic structure, is high in strength and uniform in pore size and is free of residue of carbon and free silicon, and the strength, high-temperature resistance and thermal shock resistance of the foamed ceramic are improved substantially.

Description

technical field [0001] The invention relates to silicon nitride, silicon carbide and niobium carbide foam ceramics, belonging to the technical field of porous ceramic preparation. Background technique [0002] Silicon nitride, silicon carbide combined with niobium carbide composite ceramic is a structural ceramic material with low expansion, corrosion resistance, high strength and high temperature resistance. Silicon nitride, silicon carbide and niobium carbide foam ceramics are mainly used as molten steel filter elements in steel casting and other industries for large 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, sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/56
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH
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