Abstract
4YSZ–LaPO 4 composites with different LaPO 4 content ranging from 0 to 30 vol.% were prepared. Influence of LaPO 4 content on the microstructure, mechanical properties and thermal shock resistance under mild thermal conditions of the composites were investigated. With the increased content of monazite LaPO 4, Vickers hardness, flexural strength and fracture toughness of the 4YSZ–LaPO 4 composites exhibited a gradual degradation, while the thermal shock resistance was improved obviously. Results showed that the critical thermal shock temperature (Δ T c) of 4YSZ/30 vol.% LaPO 4 composite under air quenching was 1400 °C, which was 400 °C higher than that of monolithic 4YSZ. Improvement of thermal shock resistance for 4YSZ–LaPO 4 composites was mainly due to the higher ratio value of K Ic/ σ and the crack deflection and bridging at weak bonding interface between ZrO 2 and LaPO 4.
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