Effect of SiC Submicrometer Particle Size and Content on Fracture Toughness of Alumina–SiC “Nanocomposites”

Abstract

A simple model was developed which describes the effect of SiC submicrometer particles on the fracture toughness of alumina–SiC “nanocomposites.” This effect was attributed to the change in the fracture mode observed in alumina on adding SiC submicrometer particles, which was suggested to be a result of both matrix weakening and grain boundary strengthening. The model suggests that the increase in fracture toughness should be obtained only for small additions (less than 5 wt%) of SiC.