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Hardness and modulus of CrNx coatings

Published online by Cambridge University Press:  11 February 2011

G. C. A. M. Janssen ,
R. Hoy  and
J.-D. Kamminga
G. C. A. M. Janssen
Affiliation:
Department of Material Science and Technology, Delft University of Technology, the Netherlands, e-mail: g.c.a.m.janssen@tnw.tudelft.nl
R. Hoy
Affiliation:
Netherlands Institute for Metals Research, Delft, the Netherlands
J.-D. Kamminga
Affiliation:
Netherlands Institute for Metals Research, Delft, the Netherlands
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Abstract

Two series of CrNx coatings have been deposited in an industrial PVD set-up. It is shown that for an increased ion bombardment on the growing film the hardness (H) and Young's modulus (E) are independent on composition. For these hard coatings the elastic strain to failure or plasticity limit (H/E) is 0.11. The coating fails long before it is stretched to its plasticity limit. Deformation of the coating by 1% already leads to crack formation. It is argued that the cause of this failure is the low work of fracture of the coating combined with flaws in the coating.

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References

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