AVS 47th International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP19
Friction on Diamond-Like Thin Films : Analysis by XPS

Tuesday, October 3, 2000, 5:30 pm, Room Exhibit Hall C & D

Session: Poster Session
Presenter: J.M. Campbell, Helsinki University of Technology, Finland
Authors: J.M. Campbell, Helsinki University of Technology, Finland
L.-S. Johansson, Helsinki University of Technology, Finland
J. Koskinen, VTT Manufacturing Technology, Finland
Correspondent: Click to Email
Under humid conditions, an anomalous drop occurred in the coefficient of friction for a stainless steel ball bearing impinging on a Diamond-Like Coated (DLC) metal ring. XPS analysis of the wear area revealed minute but significant changes from the native film surface. Metal particles were present on the wear track; however, no chemical change in the DLC film was apparent. Assessment of the inelastic background shows that the metal resides on top of the DLC film. It is believed that the metal particles adsorb water from the humid atmosphere to form a lubricating layer.