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概要

Strength of dense ceramics is basically determined by the defects near surface, while the damage introduced -y the ion irradiation is also limited to the near surface. The purpose of this study is to establish the simple valuation method of irradiation effect on mechanical property for ceramics by mean of flexural test after on irradiation instead of neutron irradiation. Flexural strength of CVD-SiC following ion irradiation ncreased in all condition, although the strength and Weibull modulus decreas ed with increasing irradiation emperature up to 1273K. This tendency was also observed in fracture toughness by indentation test. It was evealed by SEM observation that the initial cracks propergation region of unirradiated sample almost corresponded t o the damage area of the irradiated sample, and less cracks were observed in the irradiated ample than unirradiated sample. From these results, flexural test seems reasonable and consistent to Evaluate mechanical property of B-SiC after ion irradiation.

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