No.8（2013）4.Friction characteristics of DLC coated rubber used AISI 52100 steel under un-lubricated condition

Kenta Nakamura, Katsuyuki Fujimura, Masayoshi Muraki

  Friction characteristics of DLC coated rubber and an AISI 52100 steel ball were studied with a ball-on-disk type tribo-tester. Experiments were conducted under a sliding speed of 0.1m/s and a load of 0.5N. When the coefficient of friction μ was plotted against coating conditions, the μ of DLC coated rubber was shown to be lower than the substrate. And, it was also found that friction characteristics of DLC coated rubber depended upon the type of rubber. The result of a tribo-test suggested that friction becomes lower because there is not wear of the DLC film. Since adhesive friction can be reduced by DLC coating, it is thought that friction became reduced by coating a rubber surface with DLC. Moreover, it was found that the difference in substrate influences the form of the rubber surface after DLC coating. It was suggested that the change of surface form results in the difference of frictional force based upon hysteresis.

Keywords
Diamond-like carbon (DLC), Rubber, Friction characteristics

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