1302 Effect of partial oxygen pressure on crack-healing behavior of alumina/silicon carbide composite
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Effect of partial oxygen pressure on crack-healing behavior of alumina/SiC particles composite was investigated. A semi-elliptical crack with surface length of approximately 100 p.m was introduced by Vickers indentation. The specimens were heat-treated under various crack-healing conditions using tube furnace with gas flowing system. Complete strength recoveries were attained by crack-healing in low oxygen pressure of 5×10^3 and 50 Pa at optimized condition. The optimized conditions of crack-healing in 5×10^3 Pa and 50 Pa were heating at 1623 K for 1 h and 1673 K for 10 h, respectively. However, strength recovery rate by crack-healing decrease with decreasing partial oxygen pressure. From the result, it was concluded that crack could be completely healed under low partial oxygen pressure.
