抄録
Yttrium α-SiAlON ceramics with elongated grains have been fabricated by a reaction-bonding and post-sintering process. In the reaction-bonding stage, the compacts could be prepared with fine grains and uniformly dispersed porosity, and having density of about 70%. Since the initial density of the reaction-bonded compacts is high, this method has the advantage of low shrinkage during the post-sintering process. In this work, the influence of reaction-bonding conditions and starting powder composition on the elongated α-SiAlON grain growth and densification during the post-sintering process has been explored. The microstructure and phase composition were investigated before and after post-sintering. The size and amount of the elongated grains and the densification in the post-sintered samples was correlated with the composition of the reaction-bonded compacts.
