Preparation method of silicon nitride, silicon carbide combined molybdenum boride foamed ceramics

A technology of dimolybdenum boride and foam ceramics, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of poor thermal shock resistance, inability to meet the needs of continuous casting of large-scale special steel castings, and low service temperature. Excellent thermal shock resistance, light weight, 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 dimolybdenum boride 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] Will Mo 2 B, silicon micropowder, phenolic resin are the ratio of 40:40:20 with weight ratio and add concentration and be 0.1wt% hydroxypropyl methylcellulose solution 40wt% and evenly mix and make ceramic slurry, then ceramic slurry is impregnated in On polyurethane foam, after drying, heat slowly at 300°C~1450°C for 20 hours in a nitrogen atmosphere, keep at 1450°C for 5 hours, and then hold at 1700°C for 20 minutes in a vacuum or argon atmosphere to make nitrogen Silicon carbide, silicon carbide combined with dimolybdenum boride foam ceramics.

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

Embodiment 2

[0013] Will Mo 2 B, silicon micropowder, phenolic resin are the ratio of 60:25:15 with weight ratio and add concentration and be that 0.2wt% hydroxypropyl methylcellulose solution 50wt% evenly mix and make ceramic slurry, then ceramic slurry is impregnated in On polyurethane foam, after drying, slowly heat up at 300°C~1450°C for 60 hours in a nitrogen atmosphere, keep at 1450°C for 8 hours, and then hold at 1730°C for 70 minutes in a vacuum or argon atmosphere to make nitrogen Silicon carbide, silicon carbide combined with dimolybdenum boride foam ceramics.

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

Embodiment 3

[0016] Will Mo 2 B, silicon micropowder, phenolic resin are the ratio of 88:10:2 with weight ratio and add concentration and be that 0.3wt% hydroxypropyl methylcellulose solution 60wt% evenly mix and make ceramic slurry, then ceramic slurry is impregnated in On polyurethane foam, after drying, slowly heat up at 300°C~1450°C for 100 hours in a nitrogen atmosphere, keep at 1450°C for 10 hours, and then hold at 1750°C for 120 minutes in a vacuum or argon atmosphere to make nitriding Silicon, silicon carbide combined with dimolybdenum boride 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 combined molybdenum boride foamed ceramics. The preparation method is characterized by comprising the following steps: uniformly mixing Mo2B, micro silicon powder, phenolic resin and hydroxypropyl methyl cellulose to obtain a ceramic sizing agent, then soaking the ceramic sizing agent on polyurethane foam, drying the ceramic sizing agent, and burning the ceramic sizing agent in a nitrogen atmosphere to form the silicon nitride, silicon carbide combined molybdenum boride foamed ceramics. The silicon nitride, silicon carbide combined molybdenum boride foamed ceramics prepared in the method is uniform in micro structure, high in strength, uniform in porous size and capable of avoiding the residue of carbon and free silicon; moreover, the strength, high temperature resistance and thermal impact resistance can be greatly improved.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/58
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH
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