切削刀具多层涂层的力学特性和耐磨性

利用纳米硬度计研究了硬质合金基体上ＣＶＤ沉积ＴｉＮ，ＴＩＮ／Ｔｉ（Ｃ，Ｎ）／ＴｉＣ、ＴｉＮ／ＴｉＮ／Ｔｉ（Ｃ，Ｎ）／ＴｉＣ／Ｔｉ（Ｃ，Ｎ）／ＴｉＣ和ＴｉＮ／Ｔｉ（Ｃ，Ｎ）／Ｔｉ（Ｃ，Ｎ）／ＴｉＣ／Ｔｉ（Ｃ，Ｎ）／ＴｉＣ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的界面失效的关系，指出可用临界载荷ｐｔ和ｐｉ来分别描述涂层的断裂

Mechanical Properties and Wear Resistance of Multilayer Thin Coatings on Cutting Tools

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.