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Continuous microscratch measurements of the practical and true works of adhesion for metal/ceramic systems

Published online by Cambridge University Press:  31 January 2011

S. Venkataraman ,
D. L. Kohlstedt  and
W. W. Gerberich
S. Venkataraman
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
D. L. Kohlstedt
Affiliation:
Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455
W. W. Gerberich
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract

Using a continuous microscratch technique, the adhesion strengths of Pt, Cr, Ti, and Ta2N metallizations to NiO and Al2O3 substrates have been characterized. The practical work of adhesion was determined as a function of both thickness and annealing conditions. For all except the Ta2N films, the practical work of adhesion increases nonlinearly from a few tenths of a J/m2 to several J/m2 as the thickness of the thin film is increased, indicating that a greater amount of plastic work is expended in delaminating thicker films. Further, the practical work of adhesion also increases with increasing annealing temperature, indicating stronger bonding at the interface. In the limit that the film thickness tends to zero, the plastic energy dissipation in the film tends to zero. As a result, the extrapolation to zero thickness yields the true work of adhesion for that system.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 3133 - 3145
Copyright
Copyright © Materials Research Society 1996

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