Silicon Carbide Whisker Reinforced Alumina

Abstract

Development of technology to commercially produce silicon carbide whiskers began in the early 1970's. Since then, researchers have shown that reinforcement with SiC whiskers markedly improves mechanical properties of alumina composites. By increasing fracture toughness from 2 7 MPa m1/2 for alumina to 6.6 MPa m1/2 for SiC whisker reinforced alumna, the composite is less sensitive to flaw size resulting in improved resistance to crack growth. The improved fracture toughness, high temperature strength, and hardness has led to commercial applications such as cutting tool inserts, beverage-can forming tools and wear resistant parts.