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A kind of preparation method of silicon nitride, silicon carbide combined with zirconium boride foam ceramics

A foamed ceramic and silicon carbide technology, applied in the fields of silicon carbide combined with zirconium boride foamed ceramics and silicon nitride, can solve the problems of low operating temperature, inability to meet the continuous casting of large special steel castings, poor thermal shock resistance, etc. The effect of increased strength, light weight, and excellent thermal shock resistance

Inactive Publication Date: 2015-12-30
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 zirconium 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] ZrB 2 , silicon micropowder, and phenolic resin are mixed uniformly with a weight ratio of 40:40:20 and an additional concentration of 0.1wt% hydroxypropyl methylcellulose solution 40wt% to make a ceramic slurry, and then the ceramic slurry is impregnated in polyurethane On the foam, after drying, slowly heat up 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 silicon nitride , Silicon carbide combined with zirconium boride foam ceramics.

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

Embodiment 2

[0013] ZrB 2 , microsilica powder, and phenolic resin are uniformly mixed with a weight ratio of 60:25:15 and an additional concentration of 0.2wt% hydroxypropyl methylcellulose solution 50wt% to make a ceramic slurry, and then the ceramic slurry is impregnated in polyurethane On the foam, after drying, heat slowly 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 silicon nitride , Silicon carbide combined with zirconium boride foam ceramics.

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

Embodiment 3

[0016] ZrB 2 , silicon micropowder, and phenolic resin are uniformly mixed with a weight ratio of 88:10:2 and an additional concentration of 0.3wt% hydroxypropyl methylcellulose solution 60wt% to make a ceramic slurry, and then the ceramic slurry is impregnated in polyurethane On the foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 100 hours, keep at a temperature of 1450°C for 10 hours, and then hold at a temperature of 1750°C for 120 minutes in a vacuum or argon atmosphere to make silicon nitride , Silicon carbide combined with zirconium 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

A method for preparing silicon nitride, silicon carbide and zirconium boride foam ceramics, characterized in that: ZrB2, silicon micropowder, phenolic resin and hydroxypropyl methylcellulose solution are uniformly mixed to form a ceramic slurry, and then the ceramic The slurry is impregnated on the polyurethane foam, and after drying, it is fired in a nitrogen atmosphere to form silicon nitride, silicon carbide and zirconium boride foam ceramics. The silicon nitride, silicon carbide and zirconium boride foam ceramics prepared by the present invention have uniform microstructure, high strength, and uniform pore size, avoiding the residue of carbon and free silicon, and greatly improving the strength, high temperature resistance, and thermal shock resistance. improve.

Description

technical field [0001] The invention relates to silicon nitride, silicon carbide and zirconium boride foam ceramics, belonging to the technical field of porous ceramic preparation. Background technique [0002] Silicon nitride, silicon carbide combined with zirconium boride foam ceramics is a structural ceramic material with low expansion, corrosion resistance, high strength and high temperature resistance. Silicon nitride, silicon carbide combined with zirconium 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 zirconium boride foam ceramics generally have problems such as low service temperature and poor thermal shock resistance, which can no longer 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 sil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/58C04B35/565C04B35/584C04B35/622
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH
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