J044094 研摩ダイヤモンド膜と金属の間の低摩擦摺動における速度依存性評価([J04409]知的材料・構造システム(9))

Abstract

Institute of Fluid Science, Tohoku University Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, JapanChemical vapor deposition (CVD) diamond film is well known as the material of high hardness, good wear resistance and so on. It is suitable for the maintenance free solid lubrication film for sliding bearing, but as-deposited CVD diamond films have a rough surface which induces high friction and severe abrasion. To realize the low frictional properties, diamond films have to be well polished or deposited as smooth surfaces. We have developed the deposition process for easy abrasable diamond films. These kinds of diamond films are moderately polished and show a stable low friction between films and steel pins in dry air. In addition, the extremely low friction phenomena of noiseless sliding between films and counter metals were realized as relatively higher sliding speed. These phenomena are similar to a certain type of air bearing. In the present study, we evaluate the sliding speed and contact pressure dependency of the friction properties on polished diamond films. The friction properties between polished diamond films and an AISI440C pin under dry condition were performed in the atmosphere. Definite reductions of the friction coefficient obtained by the sliding speed and contact pressure dependence measurements were clearly observed.