Mechanical and Phase Stability of Zirconia Toughened Alumina
The JMM-ZTA, a kind of zirconia-toughened alumina, is a bearing ceramic newly developed for artificial joints. Although it has already been reported that mechanical strength and fracture toughness are higher in the JMM-ZTA than in alumina, the stability of the JMM-ZTA has not been studied in detail yet. In the present study, the stability of the JMM-ZTA with respect to mechanical strength and crystalline phases was examined under hydrothermal environment, and the results were compared with those of alumina. Both the 4-point bending strength and the fraction of monoclinic zirconia unchanged even after the aging test at 121°C for 300 h. These results indicate that the JMM-ZTA possesses quite excellent stability to be used as bearing material of artificial joints.
Xingdong Zhang, Xudong Li, Hongsong Fan, Xuanyong Liu
T. Nakanishi et al., "Mechanical and Phase Stability of Zirconia Toughened Alumina", Key Engineering Materials, Vols. 330-332, pp. 1267-1270, 2007