Ti, TiO_2 および TiN 薄膜の摩擦・摩耗特性に対する雰囲気圧力依存性

概要

論文の詳細を見る
Tribological properties of Ti-based (Ti, TiO2 and TiN) thin films on a stainless steel (304SS) substrate were investigated at several pressures in an atmosphere of the air. Films 0.2 µm thick were prepared on a mirror-polished substrate using each method of ion beam assisted deposition, ion beam assisted reactive deposition and dynamic ion beam mixing. The tribological test was carried out with a tribo meter of a pin-on-disk type in a high vacuum chamber. The wear surface was observed with a scanning laser microscope and a scanning electron microscope. The friction coefficient of stainless steel in a pressure of 1×105 Pa showed a lower value than that in 1×10-5 Pa, because oxygen or moisture contained in the air played a role of lubrication. Also the TiN thin film in 1×105 Pa showed a low friction coefficient until wearing the TiN layer on a substrate at a sliding distance of 10 m. However friction coefficients of the TiO2 and Ti thin film were hardly dependent on a gas pressure. In the case of 5 m in a sliding distance, friction coefficients of Ti-based thin films converged on 0.3 at a pressure of 1×10-3 Pa.
2003-11-01