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Nanoindentation and Nanoscratching of Hard Carbon Coatings for Magnetic Disks

Published online by Cambridge University Press:  15 February 2011

T. Y. Tsui ,
G. M. Pharr ,
W. C. Oliver ,
C. S. Bhatia ,
R. L. White ,
S. Anders ,
A. Anders  and
I. G. Brown
T. Y. Tsui
Affiliation:
Department of Materials Science, Rice University, Box 1892, Houston, TX 77251
G. M. Pharr
Affiliation:
Department of Materials Science, Rice University, Box 1892, Houston, TX 77251
W. C. Oliver
Affiliation:
Nano Instruments, Inc., Box 14211, Knoxville, TN 37914
C. S. Bhatia
Affiliation:
IBM Storage Systems Division, 5600 Cottle Road, San Jose, CA 95193
R. L. White
Affiliation:
IBM Storage Systems Division, 5600 Cottle Road, San Jose, CA 95193
S. Anders
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
A. Anders
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
I. G. Brown
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
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Abstract

Nanoindentation and nanoscratching experiments have been performed to assess the mechanical properties of several carbon thin films with potential application as wear resistant coatings for magnetic disks. These include three hydrogenated-carbon films prepared by sputter deposition in a H2/Ar gas mixture (hydrogen contents of 20, 34, and 40 atomic %) and a pure carbon film prepared by cathodic-arc plasma techniques. Each film was deposited on a silicon substrate to thickness of about 300 nm. The hardness and elastic modulus were measured using nanoindentation methods, and ultra-low load scratch tests were used to assess the scratch resistance of the films and measure friction coefficients. The results show that the hardness, elastic modulus, and scratch resistance of the 20% and 34% hydrogenated films are significantly greater than the 40% film, thereby showing that there is a limit to the amount of hydrogen producing beneficial effects. The cathodic-arc film, with a hardness of greater than 59 GPa, is considerably harder than any of the hydrogenated films and has a superior scratch resistance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 383: Symposium I – Mechanical Behavior of Diamond and Other Forms of Carbon , 1995 , 447
Copyright
Copyright © Materials Research Society 1995

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References

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