Microstructure and Mechanical Properties of Silicon Nitride Materials Fabricated from SHS Powders

Abstract

Two different silicon nitride powders, one produced by self‐propagating high‐temperature synthesis (SHS) and one commercial, have been equally processed to obtain dense materials. Y2O3 powders as a sintering aid and hot‐pressing techniques were used to process the materials. The fracture toughness and strength of the materials prepared have been evaluated and the results comparatively discussed as a function of the microstructure, with special emphasis on the characteristics of the initial powders.