抄録
High temperature oxidation test of α'/β' Sialon composite containing small a amount of Y-α'-sialon was conducted between 1200 and 1400°C for up to 96 hours in static air. When the oxidation temperature was higher than 1300°C, many voids were formed on the surface and the strength after oxidation decreased drastically due to the formation of pit in the matrix near surface. It is thought that these pits are formed by the local destruction of the oxidized layer during oxidation. A large amount of Y and Al diffused from inside of matrix to the surface, and concentrated in the oxidized layer.
