The preparation methods of silicon carbide special ceramics are mainly atmospheric sintering, hot pressing sintering, reactive sintering, high temperature isostatic pressing sintering. The silicon carbide ceramic thin films can be prepared by chemical vapor deposition (CVD). To improve the sintered density of silicon carbide special ceramics, can add a certain amount of B, C, B4C, Al2O3, AlN, BeO and Al as sintering additives
