Processing of porous silicon carbide with toughened strut microstructure

Abstract

Porous SiC ceramics were fabricated by the carbothermal reduction of polysiloxane-derived SiOC containing hollow microspheres followed by sintering. The effect of the Al2O3Y2O3CaO (AYC) content on the microstructure and flexural strength of the porous SiC ceramics were investigated. The growth of large plateletα-SiC grains increased with increasing additive content due to enhanced grain growth and the β→α phase transformation of SiC. In situ toughened microstructures consisting of large platelet grains and fine equiaxed grains were obtained when 10 or 20 wt% AYC was added. The porosity generally decreased with increasing the additive content, whereas the flexural strength increased. The typical flexural strength of the porous SiC ceramics sintered with 10 wt% AYC was 61MPa at a porosity of 44%. © 2010 The Ceramic Society of Japan. All rights reserved.