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X-Ray Studies of Near-Frictionless Carbon Films.

Published online by Cambridge University Press:  01 February 2011

Nikhil J Mehta
Affiliation:
Energy Technology, Argonne National Laboratory, Argonne, IL 60439, U.S.A. Materials Engineering, Auburn University, Auburn, AL 36849, U.S.A.
Sujoy Roy
Affiliation:
Physics, University of California San Diego, San Diego, CA 92093, U.S.A.
Jacqueline Anne Johnson
Affiliation:
Energy Technology, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
John Woodford
Affiliation:
Energy Technology, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Alexander Zinovev
Affiliation:
Materials Science, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Zahirul Islam
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Ali Erdemir
Affiliation:
Energy Technology, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Sunil Sinha
Affiliation:
Physics, University of California San Diego, San Diego, CA 92093, U.S.A.
George Fenske
Affiliation:
Energy Technology, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Barton Prorok
Affiliation:
Materials Engineering, Auburn University, Auburn, AL 36849, U.S.A.
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Abstract

Carbon-based coatings exhibit many attractive properties that make them good candidates for a wide range of engineering applications. Tribological studies of the films have revealed a close correlation between the chemistry of the hydrocarbon source gases and the coefficients of friction and wear rates of the diamond-like carbon films. Those films grown in source gases with higher hydrogen-to-carbon ratios had much lower coefficients of friction and wear rates than did films derived from source gases with lower hydrogen-to-carbon ratios. The mechanism for this low friction is as yet not properly understood. Ongoing structural characterization of the films at Argonne National Laboratory is gradually revealing this mechanism. Recent studies have included x-ray photoelectron spectroscopy (XPS), near edge x-ray absorption fine structure (NEXAFS) and x-ray reflectivity (XRR). XPS showed ∼10% oxygen at the surface, which was largely removed after a 1 minute sputter; NEXAFS showed a high sp2:sp3 ratio implying a highly graphitic material; and XRR has given a comprehensive depth profile, with three layers of increasing density as the substrate was approached. The paper discusses the results and correlation with previous friction measurements.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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