涂敷的超硬合金是由WC和B1型固溶体为硬质相、铁族金属为粘结相及TiC为涂敷相构成的。靠近表面涂层的基体层中的钴含量应低于基体内钴含量的40％,并且还含有40～80v01％的B1型固溶体。B1型固溶体可以是Ⅳ_a、V_a和Ⅵ-a族金属的一种或几种碳化物戏氮化物。 制作中,以前是将基体在1～700托的局部氮压下于1200～1600℃处理10min到5h,然后涂以TiC The coated cemented carbide is composed of a solid solution of WC and B1 solid solution, an iron-based metal as a binder phase, and TiC as a coating phase. The cobalt content in the base layer close to the surface coating should be lower than 40% of the cobalt content in the base and also contain 40-80 vol% of the B1 type solid solution. The type B1 solid solution may be one or more carbide halides of the IVa, Va and VI-a metals. Production, the former is the substrate at 1 ~ 700 torr partial pressure at 1200 ~ 1600 ℃ for 10min to 5h, and then coated with TiC