J. Japan Inst. Metals, Vol. 56, No. 11 (1992),
pp. 1280-1288

Transformation Toughening by Dispersed ZrO₂ in SiC_W/ZrO₂/Al₂O₃ Composite

Yasuo Kogo¹, Yutaka Kagawa² and Hiroshi Hatta¹

Abstract:

Fracture toughness of SiC whisker and ZrO₂ particle reinforced alumina matrix composite was investigated under modeI and modeII loading conditions.
Under modeI loading condition, the critical stress intensity factor increased with increasing ZrO₂ volume, which well agreed with theoretical estimation. It was also shown by the theoretical analysis that the transformation of ZrO₂ was less effective to the toughness of the composite under modeII loading, which was consistent with the experimental results.

(Received 1992/06/04)

Keywords:

ceramic matrix composites, fracture toughness, transformation toughening, martensitic transformation, mode II loading condition

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