Fracture toughness of ZrO 2 ‐toughened alumina could he increased by macroscopic interfaces, such as those existing in laminated composites. In this work, tape casting was used to produce A/A or A/B laminates, where A and B can be Al 2 O 3 , Al 2 O 3 /5 vol% ZrO 2 , and Al 2 O 3 /l0 vol% ZrO 2 . An increase of toughness is observed, even in the Al 2 O 3 /Al 2 O 3 laminates.
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Boch et al. (1986) studied this question.