中文摘要：

采用改进的预处理方法和变参数沉积工艺在硬质合金刀片上制备了超细晶粒金刚石薄膜涂层。通过玻璃纤维增强塑料的车削试验，研究了薄膜与基体之间的附着强度、涂层刀具的磨损和加工工件的表面粗糙度。试验结果表明改进的预处理方法能够有效增强金刚石薄膜与基体之间的附着强度；超细晶粒金刚石薄膜减小了刀具与工件之间的摩擦，降低了刀具磨损，并使加工表面的表面粗糙度显著降低；使用改进预处理方法和变参数沉积工艺制备的超细晶粒金刚石涂层刀具的寿命达到未涂层刀具寿命的8倍以上。

英文摘要：

Ultra-fine grain diamond films were fabricated on cemented tungsten carbide inserts by variable deposition process and an improved combined pretreatment of Murakami＇s reagent, acid etching and microwave plasma decarburization in Ar-H2 gas. The adhesive strength of the films to the substrates, diamond-coated tool wear and surface roughness of the workpiece were further studied by turning glass fiber reinforced plastic cylindrical bars. The experimental restdts show that the improved combined pretreatment is more effective on enhancing the adhesive strength of diamond films to the substrate. The lifetime of the diamond coated tools subjected to such pretreatment demonstrate up to 8 times longer than uncoated ones. Ultra-fine grain diamond films lead to remarkably lower surface roughness of the workpiece and longer lifetime.