Preparation and properties of porous lanthanum doped alumina ceramic composites with self-organization

Abstract

Porous lanthanum doped alumina ceramic composite was prepared by self-organization and solid-state reaction between Al2O3 and La2O3. Crystal phases, microstructure and density of ceramics were examined to characterize novel composites in the system of Al 2O3 and La2O3. After heat treatment at 1300°C and 1400°C, LaAl11O18 plate-like crystals were formed through the solid-state reaction of LaAlO3 with Al2O3. The addition of large amounts of La contributed to the increase of LaAl11O18 platelike crystals and their cross-linking microstructure. The porous alumina composites maintained high surface areas of 20 m2/g after heating at 1300°C, and 11 m 2/g at 1400°C. The bending strength of La added alumina composite was 57 MPa after heating at 1400°C. © 2009 The Ceramic Society of Japan.