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Scratch Test Measurements on CrNx Coatings

Published online by Cambridge University Press:  01 February 2011

R. Hoy ,
P. van Essen ,
J.-D. Kamminga ,
G. C. A. M. Janssen  and
A. P. Ehiasarian
R. Hoy
Affiliation:
Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628 AL Delft, Netherlands
P. van Essen
Affiliation:
Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628 AL Delft, Netherlands Delft University of Technology, Department of Materials Science and Technology, Rotterdamseweg 137, 2628 AL Delft, Netherlands, e-mail: G.C.A.M.Janssen@tnw.tudelft.nl
J.-D. Kamminga
Affiliation:
Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628 AL Delft, Netherlands
G. C. A. M. Janssen
Affiliation:
Delft University of Technology, Department of Materials Science and Technology, Rotterdamseweg 137, 2628 AL Delft, Netherlands, e-mail: G.C.A.M.Janssen@tnw.tudelft.nl
A. P. Ehiasarian
Affiliation:
Materials Research Institute, Sheffield Hallam University, Sheffield, UK
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Abstract

Hard CrNx coatings of various composition were deposited on hot work tool steel by means of reactive sputter deposition in an industrial PVD reactor. All deposited coatings (thickness 3–4 micron) were under compressive stress. The coatings were subjected to scratch testing with a diamond stylus. Two critical loads were determined. The first critical load, Lc1, indicates the onset of chipping and/or spalling. The second critical load, Lc2, indicates complete coating removal inside the track. Micrographs showing the coating failure are presented. Stoichiomeric CrN coatings outperform understoichiometric CrN0.6 coatings in scratch tests. It was found that for all specimens the coating-to-substrate adhesion is very good, independent on composition. Although the values of Lc1 and Lc2 are distinctly different, their dependence on composition is similar.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U8.16
Copyright
Copyright © Materials Research Society 2004

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References

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