DLC膜の潤滑中の摩擦特性に及ぼす電場の影響

抄録

In recent years, an increase of energy efficiency of machines became worldwide request. Therefore, the reduction of friction loss in the sliding part has become an urgent issue. Generally, under high pressure conditions, the oil thickness decreases, resulting in a boundary lubrication condition where direct contact between two sliding surfaces occurs, and the friction coefficient increases. In order to reduce friction in this boundary lubrication condition, diamond-like carbon (DLC) coatings, which are carbon-based hard coatings, has many applications parts. The present paper demonstrates a fundamental study of a new method using electronic field at contact surfaces. We conducted the friction test using a pin-on-disk friction tester. The friction tester had a SUJ2 ball or ta-CNx-coated ball and a soda-lime glass plate. We used 30-μL propylene glycol (PG) as lubricant, and applied DC voltage to contact area during the friction tests. As a result, the friction test with the ta-CNx-coated ball showed a low friction coefficient but no lower friction by electronic field. On the other hand, the electric bias reduced the friction coefficient with the SUJ2 ball.