Analysis of wear mechanism of ceramic roaring film with CCD microscope tribo-system

点击翻译按钮获取中文摘要

The first purpose of this study is to clarify the types of microscopic wear modes on the wide range of normal load and sliding velocity and those mechanisms by performing friction test of ceramic coating with CCD microscope tribo-system, which was developed by the representative of this study. The second purpose of this study is to construct the world's first wear map of ceramic coatings by analysis of the generation condition of each wear modes theoretically, in order to clarify the use standard of ceramic coating as a wear resistant frictional element.In this year the reciprocating pin-on-disk friction test between DLC coating and diamond pin was performed. We performed the friction test on the wide range of normal loads and sliding velocities with directly observing the generation process of wear particles with CCD microscope. Consequently we clarify the several type of the microscopic wear modes depend on apparent contact pressure Pa and those mechanisms described as bellow(1) P_a>P_<c2> : Peeling of the coaling film is generated in the first cycle of friction.(2) P_<c1><P_a<P_<c2> : Peeling of the coating film is generated after given cycles of friction.(3) P_a<P_<c1> : Although the peeling of coating film is not generated, wear of coating film itself is generated.(4) There exist two types of coating film's wear modes as described bellow・ Flake formation : Large scale brittle fracture type wear generated by the effects of apparent contact pressure and apparent shear stress.・ Powder formation: Local brittle fracture type wear (mild wear) generated by the effects of real contact pressure and shear stress in the contact interface.