TRIBOLOGY PROPERTY OF SURFACE MODIFICATION FILM

微动是在高接触压力下由重复微滑移引起的接触表面的典型摩擦学失效。研究课题是通过微动详细观察表面裂纹的发生形式，明确薄膜涂层表面裂纹的发生机理。因此，我们使各种试样在同一材料的S45C上进行涂层处理。采用CVD、PVD、离子镀等多种镀膜方法。在今年的一系列实验中，观察了薄膜涂层表面裂纹破坏的发生，裂纹的扩展以及扩展的方向，特别是接触疤痕周长或深度的哪个方向穿过薄膜。实验结果表明，在近2μm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受到极大的限制。这一结果表明，在微动保护的情况下，薄涂层表面是多么可取。在此之后，我们计划进行更精确和系统的微动测试，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.