作　　者： ; ;

机构地区： 清华大学机械工程学院摩擦学国家重点实验室

出　　处： 《摩擦学学报》 2000年第3期170-174,共5页

摘　　要： 利用纳米硬度计研究了硬质合金基体上 CVD沉积 Ti N、Ti N/Ti( C,N) /Ti C、Ti N/Ti( C,N) /Ti C/Ti( C,N) /Ti C和 Ti N/Ti( C,N) /Ti C/Ti( C,N) /Ti C/Ti( C,N) /Ti C等 4种涂层的硬度和断裂韧性 ,讨论了载荷与压入深度关系曲线上的台阶和载荷与压入深度平方关系曲线上的直线段与涂层的断裂失效和界面失效的关系 ,指出可用临界载荷 pf 和pi来分别描述涂层的断裂失效和界面失效行为 .对 4种涂层的硬度、断裂韧性、界面失效载荷和耐磨性的研究结果表明 ,随着涂层层数的增加 ,其断裂韧性和耐磨性都相应提高 . Coatings of TiN, TiN/Ti(C,N)/TiC, TiN/Ti(C,N)/TiC/Ti(C,N)/TiC and TiN/Ti(C,N)/TiC/Ti(C,N)/TiC/ Ti(C,N)/TiC were prepared on cemented carbide substrate by chemical vapor deposition (CVD). The mechanical properties and wear resistance of the coatings were examined with a nano indentor equipped with an optical microscope and an atomic force microscope as the attachments. It has been found that a step appears on the loading force displacement curves at the onset of coating fracture and a straight line segment appears on the loading force square of indented depth curves, the latter could be used to identify the interfacial failure of the coatings. The crifical load p f and p i was proposed to be used to describe the fracture failure and the interfacial failure of the coatings, respectively. Generally speaking, multi layer coatings have better mechanical properties and higher wear resistance than the mono layer counterpart. With increasing in the layer number, the fracture toughness and wear resistance of the multi layer coatings increase as well.

关 键 词： 多层涂层 力学特性 耐磨性 切削刀具

领　　域： [金属学及工艺] [金属学及工艺] [金属学及工艺]