As the difficult processed materials advent and the requiring of the tool becomes higher and higher recently, it is necessary to improve the life by the way of PCVD- coating ceramic Si_3N_4-BN.

• 由于难加工材料的不断出现,对刀具的要求越来越高,因此有必要通过PCVD(等离子化学气相沉积技术)方法给其表面涂镀陶瓷薄膜Si3N4-BN来提高寿命。