DLC-樹脂間のプラズマ潤滑効果

抄録

Diamond like carbon (DLC) has widespread applications in many fields because of its excellent properties. Recently, DLC is applied to machine parts as coating to reinforce the surface property. On the other hand, the use of polymer parts made of engineering plastics is increasing instead of metal ones because polymer is light, low cost and easily processed. It is expected in the future that the application of DLC to metal comes to be more frequent in order to further improve the sliding property between metal-polymer contact in sliding parts. For that reason, it is important to clarify the characteristic of friction between DLC and polymer. In this research, silicon doped DLC (a-C:H:Si), which is coated by plasma enhanced chemical vapor deposition (PECVD) on a steel disk (SUS304, JIS), was used as a mating material of sliding against Polyoxymethylene (POM). Friction tests were conducted in a roller-on-disk apparatus under dry condition, where the side surface of POM roller was contacted to DLC-coated disk. During the total sliding distance of 200 m, helium gas flow and helium plasma flow were irradiated. After irradiation, friction coefficient rapidly fell down to around 0.066 from 0.2 and was stabilized.