Comparison of the high-temperature deformation of aiumina-zirconia and alumina-zirconia-mullite composites

摘要

An alumina-based ceramic codispersed with 15 vol percent zirconia and 15 vol percent mullite (AZM) was synthesized by reactive processing, and the creep behavior was compared to alumina with 30 vol percent zirconia (AZ). Constant stress compressive creep behavior for AZM exhibited a stress exponent of 2 and an activation energy of 770 KJ/mol, while a similar stress exponent but lower activation energy of 660 KJ/mol was found for AZ. The strain rate of AZM, however, was more than twice that of the AZ under the same deformation conditions, indicating a better potential for superplastic shape forming.