Composite coatings incorporating solid lubricant phases

  • J. E. Krzanowski
  • J. L. Endrino
  • J. J. Nainaparampil
  • J. S. Zabinski
Article

Abstract

The concept of incorporating a solid lubricant, silver (Ag), within a hard carbide film for vacuum tribology applications is investigated in this paper. SiC/Ag and HfC/Ag films were deposited by magnetron cosputtering at 200 °C onto Si and 440C steel substrates. The composition, phase structure, and morphology in these films was examined using x-ray diffraction, scanning electron microscopy, and x-ray photoelectron spectroscopy. The microstructural analysis showed that Ag was incorporated both within and on the surface of the films. There was a strong tendency for Ag to segregate to the film surface. Vacuum tribology tests were conducted using a ball-on-disk test in a vacuum of 1.33 µPa with a 1 N load for 10 000 cycles. For both the SiC/Ag and HfC/Ag films, the average friction coefficients were reduced when sufficient Ag was present. These tests show that carbide-Ag composite films hold promise for vacuum tribology applications.

Keywords

carbides friction hard coatings solid lubricants tribology 

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Copyright information

© ASM International 2004

Authors and Affiliations

  • J. E. Krzanowski
    • 1
  • J. L. Endrino
    • 1
  • J. J. Nainaparampil
    • 2
  • J. S. Zabinski
    • 2
  1. 1.Mechanical Engineering DepartmentUniversity of New HampshireDurham
  2. 2.Air Force Research Laboratory, MLBTWright-Patterson AFB

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