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Fracture toughness of diamondlike carbon coatings

Published online by Cambridge University Press:  31 January 2011

M. Nastasi ,
P. Kodali ,
K. C. Walter ,
J. D. Embury ,
R. Raj  and
Y. Nakamura
M. Nastasi
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P. Kodali
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
K. C. Walter
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. D. Embury
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
R. Raj
Affiliation:
Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309-0422
Y. Nakamura
Affiliation:
Department of Mechanical Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Abstract

The fracture behavior of diamondlike carbon (DLC) coatings on Si substrates has been examined using microindentation. The presence of DLC coatings reduces the radial crack length to less than one-half the crack length observed in uncoated Si at the same indenter load. A total work of fracture analysis of the radial cracks formed in the DLC-coating/Si-substrate system gives 10.1 MPa m1/2 as the average fracture toughness for DLC alone. A bond-breaking calculation for DLC suggests that the elastic limit fracture toughness should be 1.5 MPa (m)1/2. The higher value obtained from experiment and total work analysis suggests that plastic work and/or a tortuous path crack evolution occurred during DLC fracture process.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 2173 - 2180
Copyright
Copyright © Materials Research Society 1999

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