Partial reducing sintering of a alumina nickel composite and its mechanical properties

Abstract

It is difficult to prepare the fine ceramics matrix composites for improving mechanical properties, against several examples are prepared by several processes. In this study, alumina/nickel composites are prepared by in-situ process to solve this problem, and their mechanical properties are reported. XRD patterns showed that Al₂O₃/xNi (x=0∼0.4) composites form by a reduction of (1-x)Al₂O₃+xNiAl₂O₄. Fracture toughness of composites is a major increase. SEM micrograph showed nickel particles appeared in grain boundary or triple junction. They inhibited crack propagation.