1995 Volume 103 Issue 1203 Pages 1193-1196
Microstructural variation between the surface and the inside of SiC ceramics sintered with an additive of yttrium aluminum garnet (YAG) was investigated. The variation was caused by a difference in the concentration of the oxide liquid phase during sintering. The gradual change in grain size and shape was found on the surface of which thickness was about 250μm. The grain growth and transformation of β- to α-SiC proceeded at a slower rate on the surface than inside the SiC ceramics. Grains on the surface were small and spherical, but those inside were large and platelike.
