雕刻刀厂家众业达浅谈pcd刀具材料的性能
发布日期：2023-05-09 15:36:37
金刚石硬度和耐磨性极高，其显微硬度可达10000HV，是雕刻刀具材料中最硬的材料。金刚石的摩擦系数小，与非铁金属无亲和力，切屑易流出，热导率高，切削时不易产生积屑瘤，加工表面质量好。能有效地加工非铁金属材料和非金属材料，如铜、铝等有色金属及其合金、陶瓷、未烧结的硬质合金、各种纤维和颗粒加强的复合材料、塑料、橡胶、石墨、玻璃和各种耐磨的木材(尤其是实心木和胶合板等复合材料)。
金刚石的缺点是韧性差，热稳定性低。700℃～800℃时易碳化，故不适合加工钢铁材料。因为在高温下，铁原子易与碳原子作用而使其转化为石墨结构。此外，用它来加工镍基合金，刀具会迅速磨损。
立方氮化硼(CBN)的硬度仅次于金刚石，硬度可达8000HV～9000HV，并且热稳定性高(达1250℃～1350℃)，对铁族元素化学惰性大，抗粘结能力强，而且用金刚石砂轮即可磨削开刃，所以适合于加工各种淬硬钢、热喷涂材料、冷硬铸铁和硬度为35HRC以上的钴基和镍基难加工材料。
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