添加稀土可改善氮化硅性能氨化硅（Ｓｉ３Ｎ４）具有硬度高、强度大和性能稳定的特点，故而它已开始应用于高温汽轮发动机、切削工具、球轴承喷砂、烧嘴、无润滑衬套、齿轮等方面；然而，由于氮化硅系共价化合物，高温时氮的自扩散系数很小，烧结性能差，有脆性，因而又限... Adding rare earth can improve the performance of silicon nitride Ammonium silicon (Si3N4) has the characteristics of high hardness, strength and stable performance, so it has been used in high temperature steam engine, cutting tools, ball bearing sandblasting, burner, non-lubricating lining However, due to the silicon nitride covalent compounds, high temperature nitrogen self-diffusion coefficient is small, poor sintering properties, brittleness, and therefore limited ...