Abstract: The effect of silane coupling agent and SiC whisker on the rheologic behavior of injectedsuspension was studied. The process parameters were optimized by the orthogonal experiment ofthe three parameter and three levels of the injection pressure, holding pressure and holding time.To delay the consolication time of the sprue, the heating and cooling apparatus in the injectionmoulded machine were developed. A suitable debindering rule was fomulated by the analysis ofPGC and TGA of organic vehicles decomposition. Finally, the stationary blades of ceramic engine were developed successfully by pressureless sintering with multi-step heat preservation.

Key words: SiC（W）/Si₃N₄ composite ceramics, injection moulding, rheologic behavior, silanecoupling agent, debindering