Large, hard ZrO 2 agglomerates remained in an Al 2 O 3 /ZrO 2 composite suspension after inefficient ball‐milling. The ZrO 2 agglomerates shrank away from the consolidated Al 2 O 3 /ZrO 2 powder matrix during sintering, producing crack‐like voids which were responsible for strength degradation.
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Lange et al. (1983) studied this question.
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