Microstructure and Thermal Shock Resistance of LaPO4-ZrO2
LaPO4-ZrO2 composites were prepared by slip casting and pressureless-sintered in air. The effects of LaPO4 addition on microstructure and thermal shock resistance were addressed. The thermal shock resistance of the composites was evaluated by air quenching and a subsequent three-point bending test to determine the strength degradation. Comparisons were made with results from parallel experiments conducted using a ZrO2 ceramic without LaPO4 additions. The reference ZrO2 ceramic showed the expected substantial strength losses when thermally quenched from 470oC above room temperature. By contrast, the LaPO4-ZrO2 ceramics, while displaying reduced strength relative to the reference ZrO2 ceramics, exhibited minimal strength degradation under severe thermal shock conditions.
Wei Pan and Jianghong Gong
Z. Q. Li et al., "Microstructure and Thermal Shock Resistance of LaPO4-ZrO2", Key Engineering Materials, Vols. 368-372, pp. 1633-1635, 2008