2001 Volume 109 Issue 1271 Pages 607-611
Al2O3/YAG fiber composite was prepared and its high temperature mechanical properties investigated. The mechanical properties did not show any remarkable degradation up to temperatures≤1673K in comparison with room-temperature values. The strength and fracture toughness at high temperature could be remarkably improved above those of monolithic alumina by adding YAG fibers. As factor leading to such an improvement, it was observed that the fracture mode of the YAG fibers becomes intergranular with rising temperature. The degradation of Young's modulus caused upon temperature rise in alumina ceramics was compensated by the increase of fracture energy due to the change of fracture mode for the YAG fibers.
