Composites of Al 2 O 3 and Y 2 O 3 partially‐stabilized ZrO 2 were isostatically hot‐pressed using submicrometer powders as the starting material. The addition of Al 2 O 3 resulted in a large increase in bending strength. The average bending strength for a composite containing 20 wt% Al 2 O 3 was 2400 MPa, and its fracture toughness was 17 MN·w −3/2
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Tsukuma et al. (1985) studied this question.
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