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RESEARCH PAPERS

Lubrication by Diamond and Diamondlike Carbon Coatings

[+] Author and Article Information
Kazuhisa Miyoshi

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135

J. Tribol 120(2), 379-384 (Apr 01, 1998) (6 pages) doi:10.1115/1.2834437 History: Received November 21, 1996; Revised May 26, 1997; Online January 24, 2008

Abstract

Regardless of environment (ultrahigh vacuum, humid air, dry nitrogen, or water), ion-beam-deposited diamondlike carbon (DLC) and nitrogen-ion-implanted, chemical-vapor-deposited (CVD) diamond films had low steady-state coefficients of friction (<0.1) and low wear rates (≤ 10−6 mm3 /N·m). These films can be used as effective wear-resistant, self-lubricating coatings regardless of environment. On the other hand, as-deposited, fine-grain CVD diamond films; polished, coarse-grain CVD diamond films; and polished and then fluorinated, coarse-grain CVD diamond films can be used as effective wear-resistant, self-lubricating coatings in humid air, in dry nitrogen, and in water, but they had a high coefficient of friction and a high wear rate in ultrahigh vacuum. The polished, coarse-grain CVD diamond film revealed an extremely low wear rate, far less than 10−10 mm3 /N·m, in water.

Copyright © 1998 by The American Society of Mechanical Engineers
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