Preparation method of silicon nitride, silicon carbide and tantalum carbide combined foam ceramic

A foamed ceramic and silicon carbide technology, which is applied in the fields of silicon carbide combined with tantalum 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 TaC, silicon micropowder, and phenolic resin in a ratio of 40:40:20 by weight and add 0.1wt% hydroxypropyl methylcellulose solution 40wt% to make a ceramic slurry, and then impregnate the ceramic slurry On the polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is slowly raised at a temperature of 300°C to 1450°C for 20 hours, kept at a temperature of 1450°C for 5 hours, and then kept at a temperature of 1700°C for 20 minutes to form a combination of silicon nitride and silicon carbide. Tantalum carbide foam ceramics.

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

Embodiment 2

[0013] Mix TaC, silicon micropowder, and phenolic resin in a ratio of 60:25:15 by weight and add 0.2wt% hydroxypropyl methylcellulose solution 50wt% to make a ceramic slurry, and then impregnate the ceramic slurry On the polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is slowly raised at a temperature of 300°C to 1450°C for 60 hours, kept at 1450°C for 8 hours, and then kept at a temperature of 1730°C for 70 minutes to form a combination of silicon nitride and silicon carbide. Tantalum carbide foam ceramics.

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

Embodiment 3

[0016] Mix TaC, silicon micropowder, and phenolic resin with 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 the polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is slowly raised for 100 hours at a temperature of 300 ° C ~ 1450 ° C, kept at 1450 ° C for 10 hours, and then kept at a temperature of 1750 ° C for 120 minutes to form a combination of silicon nitride and silicon carbide. Tantalum 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 relates to a preparation method of silicon nitride, silicon carbide and tantalum carbide combined foam ceramic. The preparation method is characterized by comprising the following steps: uniformly mixing TaC, silicon micropowder and phenolic resin in addition to a hydroxypropyl methyl cellulose solution to prepare ceramic slurry; then, impregnating the ceramic slurry on polyurethane foam; and drying and firing in a nitrogen polyurethane to prepare the silicon nitride, silicon carbide and tantalum carbide combined foam ceramic. The silicon nitride, silicon carbide and tantalum carbide combined foam ceramic prepared by the invention is uniform in micro-structure, high in strength and uniform in pore size, and carbon and residue of free silicon are avoided, so that the strength, high-temperature resistance and hot impact resistance are greatly improved.

Description

technical field [0001] The invention relates to silicon nitride, silicon carbide and tantalum carbide foam ceramics, belonging to the technical field of porous ceramic preparation. Background technique [0002] Silicon nitride, silicon carbide combined with tantalum carbide composite ceramic is a structural ceramic material with low expansion, corrosion resistance, high strength and high temperature resistance. Silicon nitride, silicon carbide and tantalum 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/56C04B35/565C04B35/584C04B35/622
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH
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