近年来,国内外为加工淬硬钢和其它高硬度、高耐磨性材料,都在研制新型的超硬刀具材料。国内目前己初步研制成的超硬刀具材料有碳化钛基硬质合金、氧化铝基陶瓷,聚晶立方氮化硼等。但这类超硬刀具材料的抗弯强度、耐热和耐磨性能还存在着一些不足之处。氮化硅陶瓷作为金属切削刀 In recent years, at home and abroad for the processing of hardened steel and other high hardness, high wear resistance materials, are developing a new type of super-hard tool material. At present, China has initially developed a super-hard tool material carbide-based titanium carbide, alumina-based ceramics, polycrystalline cubic boron nitride. However, such super-hard tool materials, bending strength, heat resistance and wear resistance there are still some shortcomings. Silicon nitride ceramic as a metal cutter