Abstract:In order to stop reaction between silicon carbide particle and transition metals in high temperature, this research introduces a new core-shell material consisting of 80 mesh SiC particle and uniform alumina insulation layer, which is made by fluidized bed plasma enhanced chemical vapor deposition (FB-PECVD) method. The morphology, composition and phase structure of the coating were characterized by scanning electron microscope and X-ray diffractometer. The mixed sintering method was conducted to simulate the state of SiC particles mixed with transition metals at high temperatures. The alumina layer is 4 μm thick and is made of amorphous alumina with little carbonaceous impurities. After 12-hrs calcination at 700 ℃/1060 ℃ in air, the amorphous alumina layer transform to γ-Al₂O₃/α-Al₂O₃ layer. After high-temperature vacuum calcination, this insulation layer effectively prevents SiC particle from reaction with Ni-alloy metal material, resulting in better performance of SiC in high temperature.