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Friction and wear performance of diamond-like carbon, boron carbide, and titanium carbide coatings against glass

Published online by Cambridge University Press:  31 January 2011

B. K. Daniels ,
D. W. Brown  and
F. M. Kimock
B. K. Daniels
Affiliation:
Brian K. Daniels—Consulting, 451 Benner Road, Allentown, Pennsylvania 18104
D. W. Brown
Affiliation:
Diamonex, Incorporated, 7150 Windsor Drive, Allentown, Pennsylvania 18106
F. M. Kimock
Affiliation:
Diamonex, Incorporated, 7150 Windsor Drive, Allentown, Pennsylvania 18106
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Abstract

Protection of glass substrates by direct ion beam deposited diamond-like carbon (DLC) coatings was observed using a commercial pin-on-disk instrument at ambient conditions without lubrication. Ion beam sputter-deposited titanium carbide and boron carbide coatings reduced sliding friction, and provided tribological protection of silicon substrates, but the improvement factor was less than that found for DLC. Observations of unlubricated sliding of hemispherical glass pins at ambient conditions on uncoated glass and silicon substrates, and ion beam deposited coatings showed decreased wear in the order: uncoated glass > uncoated silicon > boron carbide > titanium carbide > DLC > uncoated sapphire. Failure mechanisms varied widely and are discussed. Generally, the amount of wear decreased as the sliding friction decreased, with the exception of uncoated sapphire substrates, for which the wear was low despite very high friction. There is clear evidence that DLC coatings continue to protect the underlying substrate long after the damage first penetrates through the coating. The test results correlate with field use data on commercial products which have shown that the DLC coatings provide substantial extension of the useful lifetime of glass and other substrates.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 9 , September 1997 , pp. 2485 - 2492
Copyright
Copyright © Materials Research Society 1997

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