Toughening and strengthening of translucent alumina

Abstract

Translucent alumina with anisotropic-grained microstructure was fabricated utilizing a small amount of glass-forming impu-rities and the hot isostatic pressing (HIP) method. Its total forward transmission at 600 nm is 72% (1 mm thickness), and bending strength and fracture toughness are estimated to be 649 MPa and 9.4 MPa·m0.5, respectively. Bimodal structure com-posed of elongated anisotropic-grain and fine equi-axis grain is responsible for the enhancement of mechanical properties.©2009 The Ceramic Society of Japan. All rights reserved. K. Hayashi, O. Kobayashi, S. Toyoda and K. Morinaga, Mater. Trans. JIM, 32, 1024-1029 (1991).