The present work describes the processing of alumina fiber reinforced alumina ceramic preforms consisting of chopped Al2O3 fibers (33wt%) and Al2O3 (67wt%) fine powders by slip casting. The preforms were pre-sintered in air at 1100°C for 1h. A lanthanum based glass was infiltrated into these preforms at 1250°C for 90min. Linear shrinkage (%) was studied before and after glass infiltration. Pre-sintered and infiltrated specimens were characterized by scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, porosimetry and flexural strength. The alumina preforms showed a narrow pore size distribution with an average pore size of ∼50nm. It was observed that introducing Al2O3 fibers into Al2O3 particulate matrix produced warp free preforms with minor shrinkage during pre-sintering and glass infiltration. It was observed that the infiltration process fills up the pores and considerably improves the strength and reliability of alumina preform. © 2010 Elsevier Ltd.
cited By (since 1996)3
Aa Licciulli, Contaldi, Va, Padmanabhan, S. Ka, Balakrishnan, Ab, Siligardi, Cc, and Diso, Dd, “Influence of glass phase on Al2O3 fiber-reinforced Al2O3 composites processed by slip casting”, Journal of the European Ceramic Society, vol. 31, pp. 385-389, 2011.