The preparation technology of Si3N4 ceramics has developed rapidly in the past few years. The preparation process mainly concentrates on reaction sintering method, hot pressing sintering method, atmospheric pressure sintering method, gas pressure sintering method, etc. Due to different preparation processes, various types of Silicon Nitride Ceramics
have Different microstructures (such as porosity and pore morphology, grain morphology, intergranular morphology, and intercrystalline second phase content). Therefore, the performance varies greatly. In order to obtain Si3N4 ceramic materials with excellent performance, high-quality Si3N4 powder should be prepared first. The quality of Si3N4 powder prepared by different methods is not exactly the same, which leads to the difference in its application. The failure of many ceramic materials is often attributed to Developers do not understand the differences between various ceramic powders and have insufficient knowledge of their properties.