Abstract
The effects of controlled porosity on the fracture strength of reaction-sintered SiC (RS-SiC) with free silicon removed and of RS-SiC further heat-treated at 1780 °C in a vacuum were investigated. Although further heat-treatment did not cause significant change in porosity of the porous RS-SiC, it was found that the heat-treatment caused strengthening of the porous RS-SiC with below 38% porosity and an intergranular-to-transgranular fracture transition. The strengthening effect may be attributed to increasing bonding area between grains and a relaxation of stress concentration by changing pore shape, resulting from evaporation-condensation and/or surface diffusion by the heat treatment.
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Lim, C.B., Iseki, T. Strength-porosity-microstructure relations in porous reaction-sintered SiC with free silicon removed. J Mater Sci 25, 4203–4210 (1990). https://doi.org/10.1007/BF00581073
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DOI: https://doi.org/10.1007/BF00581073