金刚石涂层用硬质合金基体表面预处理研究新进展

Advances in the Reserach of Surface Pretreatment of Cemented Carbide Substrate for Diamond Coationg

从孔隙的形成、界面非金刚石物的形成以及较高残余应力等 3个不利方面 ,分析和综述了影响金刚石涂层与硬质合金基体粘结性的主要因素。着重对浸蚀基体表面除去 Co相或浸蚀 WC相 ,在基体与涂层之间形成中间过渡层或中间化合物 ,基体表面机械或热处理等硬质合金基体表面预处理 ,改善涂层与基体粘结性的

The poor adhesivity between diamond coating and cemented carbide substrate due to is the big difference in properties of diamond and cemented carbides, especially in the presence of Co in the substrate, which has the deleterious effect and brings about the transformation of diamond to amorphous and graphitic carbon. How to improve the adhesivity is very important for the products development of carbides with diamond film. The adhesivity can be improved by strictly controlling the process of diamond depostion, but the surface pretreatmetn of cemented carbide substrate is another more important approach to improve the adhesivity. The main factors effecting the adhesivity are briefly introduced, and the recent advances in the research of surface pretreatment of cemented carbide substrate for diamond coating are reviewed.