Abstract: Ca-α-Sialon was synthesized by hot-pressing technique, and the reaction sequences and densification of Ca-α-Sialon vs
sintering temperature were studied. It was found that Ca-α-Sialon is stable. At 1250℃ the reactant mixture started to soften, and at 1300℃ gehlenite was produced
in the system; and at 1500℃ gehlenite was resolved into liquid phase and at the same time Ca-α-Sialon formed; and at 1600℃ the reaction of formation of Ca-α-Sialon
was finished and single phase Ca-α-Sialon was got. Accompanied by the above sequences, the densification was finished by liquid
sintering through particle rearrangement, solution-reprecipitation, grain growth。

Key words: Ca-α-Sialon, reaction sequences, densification