WTC2005_63798 - Proceedings of the : World Tribology...

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1 Copyright © #### by ASME Proceedings of the : World Tribology Congress III Washington Hilton, Washington DC WTC2005-63798 TRANSIENT BEHAVIOR OF NEAR FRICTIONLESS CARBON FILMS IN RECIPROCATING MICROTRIBOMETERY IN LOW HUMIDITY INERT ENVIRONMENTS P. L. Dickrell Dept of Mechanical and Aerospace Engineering University of Florida Gainesville, FL 32611 A. Erdemir Energy Technology Division Argonne National Laboratory Argonne, IL 60439 W.G. Sawyer Dept of Mechanical and Aerospace Engineering University of Florida Gainesville, FL 32611 ABSTRACT Microtribological measurements of near frictionless carbon (NFC) films in controlled gaseous environments show that water vapor plays a role in the friction coefficient. These experiments also show that the NFC films initially have high friction in argon, which then decreases. This high friction does not reform over extended periods of exposure to Ar and low partial pressures of H 2 O and O 2 . Tests varying water vapor pressure show that under certain humidity conditions the friction coefficient can increases to values seen after extended periods of environmental exposure. INTRODUCTION Diamond-like carbon (DLC) films are of tribological interest due to their low friction, low wear rate, high hardness, and chemical inertness. These films can potentially be used in a wide range of applications, such as bearings, cutting tools, submersible parts, and biomedical applications. One class of diamond-like carbon coatings termed near frictionless carbon (NFC) that was developed at Argonne National Laboratory has been shown to sustain superlow coefficients of friction (
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This note was uploaded on 08/22/2011 for the course EGM 4313 taught by Professor Mei during the Spring '08 term at University of Florida.

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WTC2005_63798 - Proceedings of the : World Tribology...

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