Microwave joining of alumina with alumina/zirconia insert under low pressure and high temperature

Abstract

Joining of alumina with an alumina/zirconia insert by microwave heating was carried out at a low mechanical pressure of 0.17 MPa and high temperatures of 1650-1750°C. Joining occurred by diffusion bonding at 1650 and 1700°C, which are lower than the eutectic temperature of alumina/zirconia, and by liquid-phase assisted bonding at 1750°C, which is higher than the eutectic temperature of alumina/zirconia. Alumina joining under a low mechanical pressure and high temperature occurred successfully. Alumina joined at 1700 and 1750°C showed strengths of 310 and 212 MPa, respectively. Finally, joining by microwave local heating was demonstrated. © 2012 The Ceramic Society of Japan.