热压氮化硅(Si_3N_4)陶瓷是用高纯度硅粉作原料,经球磨、氮化后:再掺入少量助烧结剂,热压烧结制成的新型超硬刀具材料。它的物理机械性能优于氧化铝(Al_2O_3)陶瓷和硬质合金。此外,由于热压氮化硅陶瓷的摩擦系数小(0.1),有自行润滑性,与加油的金属表面相似,因此有良好的耐磨性;而 Hot pressing silicon nitride (Si_3N_4) ceramic is a high purity silicon powder as raw material, after ball milling, nitriding: and then incorporated a small amount of sintering aid, hot pressing sintering made of new superhard cutting tool material. Its physical and mechanical properties better than alumina (Al_2O_3) ceramics and cemented carbide. In addition, due to the small coefficient of friction (0.1) of the hot-pressed Si3N4 ceramic, it has self-lubricity similar to that of a lubricated metal surface and therefore has good wear resistance;