A Strong and Damage‐Tolerant Oxide Laminate

A novel laminar oxide composite was developed. This oxide laminate, which was fabricated by hot pressing, consisted of three types of layers, which were stacked in a repeating sequence of YPO4, yttria‐stabilized ZrO 2 , 30 vol% yttria‐stabilized ZrO 2 ‐70 vol% Al 2 O 3 , and yttria‐stabilized ZrO 2 . The behavior of the oxide laminate was evaluated by four‐point flexural testing and the indentation technique. The flexural strength from one test was 358 MPa, and the load‐displacement curve of this test displayed a graceful failure. Pronounced interfacial delamination contributed to a high work of fracture and damage tolerance. These properties have rarely been observed in oxide composites and are comparable to those of non‐oxide composites, such as SiC/graphite, SiC/BN, and Si 3 N 4 /BN laminates.