TRIBOLOGY PROPERTY OF SURFACE MODIFICATION FILM

微动磨损是在高接触压力下，由于反复的微滑移而在接触表面产生的一种典型的摩擦学失效，本课题旨在详细观察微动磨损的发生形式，明确薄膜涂层表面微动磨损产生表面裂纹的机理。因此，我们制作了各种测试件，在S45C.by的相同材料上进行了各种涂层方法，如CVD，PVD和离子镀。在今年的一系列实验中，观察到薄膜涂覆表面上裂纹失效的发生，以及裂纹的扩展以及扩展的方向，特别是关于接触疤痕的圆周或深度穿过薄膜的方向。实验结果表明，在近2μm厚的薄膜涂层上，微动现象具有明显的特征。也就是说，与未涂覆的表面相比，从表面到深度的裂纹扩展被极大地限制。这一结果表明，薄涂层的表面是多么理想的情况下，保护的微动磨损。在此基础上，我们计划进行更精确、更系统的微动试验，以获得合适的薄膜涂层材料作为摩擦学材料。

The Fretting is a typical tribological failure that will be produced on the contact surface caused by repeating micro slip under high contact pressure.The research subject is to observe the form of occurrence in detail and to make clear the mechanism of occurrence of surface crack on the thin- film coated surface through fretting. Accordingly we made the various test pieces carried out a coating on the same material of S45C.by the various coating method like CVD, PVD and ion plating. In the series of experiments this year, the occurrence of crack failure on the thin- film coated surface were observed and the propagation of the crack as well as the direction of the propagation, especially about which direction of a circumference of contact scar or of depth gone through the thin-film. As results of the experiments a few distinctive features of fretting phenomena on the thin-film coated of nearly 2μm have been obtained. That is the crack propagation to the depth from a surface to be limited extremely comparing to the non-coated surface. This result suggests how the thin-coated surface is desirable on the case of protection of fretting. After this we are planning to fretting test more accurately and systematically to get the suitable thin- film coated material as tribology material.