Coefficient of Friction in Diamond-Like Carbon Films

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  • ダイヤモンド状炭素膜の摩擦特性
  • ダイヤモンドジョウ タンソマク ノ マサツ トクセイ

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Abstract

The pin-on-plate and the pin-on-disk friction test were carried out to clarify the mechanism of low friction coefficient of diamond like carbon (DLC) films. As the test piece, six kinds of commercially available DLC coated specimens were prepared. The hydrogen content of DLC was determined by elastic recoil detection analysis (ERDA) method using 2 MeV of He ion beam from the tandem accelerator. Pin-on-plate type friction test was carried out with the combination of DLC coated pin and high-speed tool steel plate. As a result of the friction test, it became clear that in the case of these combinations, all DLC show a low coefficient of friction of 0.08 - 0.09 in initial term, and it rises with time. In the case of DLC with a low hydrogen content, debris of heat-affected DLC was not observed in and around the wear truck of plate. These tendency were different from the conventional experiment that coated DLC to a plate. As a general tendency in this experiment, harder DLC film maintained lower coefficient of friction. From this result, it was estimated that DLC with low abrasion maintain high contact pressure and develop a low coefficient of friction.

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