SiC ceramic material, SiC ceramic structure, and their fabrication methods

摘要

A SiC ceramic material includes a bundle of SiC continuous fibers in a porous SiC ceramic matrix, has thermal insulation properties, a high level of strength and a high degree of toughness. A SiC ceramic structure is made of the SiC ceramic material. It is produced by preparing a pressure-sintered compact using a slurry prepared by mixing SiC powder and carbon powder in a liquid and by gasifying and releasing the carbon powder. The SiC ceramic structure can be produced by heating a reaction preparation containing a bundle of SiC continuous fibers and Si powder to a temperature equal to or higher than the melting point of silicon causing a reaction of the carbon component and Si powder and thereby obtaining a reaction-sintered compact, and by gasifying and releasing the carbon component from the reaction-sintered compact. The SiC ceramic can be produced by a chemical vapor deposition method.

主权项

1. A method for producing a SiC ceramic structure, comprising:
a slurry preparation step, in which a slurry is prepared by mixing SiC powder and carbon powder in a liquid; a pressure sintering step, in which a bundle of SiC continuous fibers and the slurry are put in a mold and sintered, while being pressurized, to obtain a pressure-sintered compact; and a decarburization step, in which the pressure-sintered compact is heated to gasify and release the carbon powder contained in the pressure-sintered compact, wherein a porosity of the SIC ceramic structure obtained by the decarburization step is within a range from 15 to 80%.