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

A technology of di-molybdenum carbide and foamed ceramics, applied in the field of silicon nitride, silicon carbide combined with di-molybdenum carbide foam ceramics, can solve the problems of poor thermal shock resistance, low service temperature, and inability to meet the continuous casting of large-scale special steel castings, etc. To achieve the effect of excellent thermal shock resistance, improved strength and light weight

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] Will Mo 2 C. Microsilica powder and phenolic resin are mixed uniformly in a weight ratio of 40:40:20 with an additional concentration of 0.1wt% hydroxypropyl methylcellulose solution 40wt% to make a ceramic slurry, and then the ceramic slurry is immersed in Polyurethane foam, after drying, in a nitrogen atmosphere, slowly increase the temperature at a temperature of 300℃~1450℃ for 20 hours, keep it at 1450℃ for 5 hours, and then keep it at a temperature of 1700℃ for 20 minutes to produce silicon nitride and silicon carbide bonded carbide Two molybdenum foam ceramics.

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

Embodiment 2

[0013] Will Mo 2 C. Microsilica powder and phenolic resin are mixed uniformly in a weight ratio of 60:25:15 with an additional concentration of 0.2wt% hydroxypropyl methylcellulose solution 50wt% to make ceramic slurry, and then the ceramic slurry is immersed in Polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is 300℃~1450℃, slowly increase the temperature for 60 hours, keep it at 1450℃ for 8 hours, and then keep it at 1730℃ for 70 minutes to make silicon nitride and silicon carbide combined with carbonization Two molybdenum foam ceramics.

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

Embodiment 3

[0016] Will Mo 2 C. Silicon powder and phenolic resin are mixed uniformly in 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 immersed in Polyurethane foam, after drying, in a nitrogen atmosphere, the temperature is 300℃~1450℃, slowly increase the temperature for 100 hours, keep it at 1450℃ for 10 hours, and then keep it at 1750℃ for 120 minutes to make silicon nitride and silicon carbide combined with carbide Two molybdenum 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, silicon carbide and molybdenum carbide combined foam ceramic. The preparation method is characterized by comprising the steps of uniformly mixing Mo2C, silica powder, phenolic resin and a hydroxypropyl methyl cellulose solution to prepare ceramic slurry; then, dipping the ceramic slurry on polyurethane foam, and drying; and next, firing at the nitrogen atmosphere to prepare the silicon nitride, silicon carbide and molybdenum carbide combined foam ceramic. The silicon nitride, silicon carbide and molybdenum carbide combined foam ceramic prepared by using the preparation method disclosed by the invention is uniform in microstructure, high in strength and uniform in pore size, and the residues of carbon and free silicon are avoided, so that the strength, high temperature resistance and thermal shock resistance of the silicon nitride, silicon carbide and molybdenum carbide combined foam ceramic are greatly improved.

Description

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

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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