Sintering of SiC with Al-B-C Additives

(New Technology and Theory)/

Abstract

a(6H)-powder was sintered by Al-B-C additives. The powder could be densified to full density at 1900oC. Grains in the sintered specimens grew to plate-shaped grains with crystal transformation of 6H to 4H. In order to clarify the role of additives in sintering, the new models and the theory for sintering and grain growth were proposed. The theory concluded that deceasing in grain boundary energy by the additives favored sintering and densification at high temperature.