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Influence of Substrate Hardness on the Response of W–C–Co-coated Samples to Depth-sensing Indentation

Published online by Cambridge University Press:  31 January 2011

J. V. Fernandes ,
A. C. Trindade ,
L. F. Menezes  and
A. Cavaleiro
J. V. Fernandes
Affiliation:
Departamento de Engenharia Mecânica, Faculdade de Ciências e Technologia da Universidade de Coimbra, Centro de Engenharia Mecânica da Universidade de Coimbra, Pinhal de Marrocos—Polo II, 3030 Coimbra, Portugal
A. C. Trindade
Affiliation:
Escola Superior de Tecnologia, Instituto Politécnico de Viseu, 3500 Viseu, Portugal
L. F. Menezes
Affiliation:
Departamento de Engenharia Mecânica, Faculdade de Ciências e Technologia da Universidade de Coimbra, Centro de Engenharia Mecânica da Universidade de Coimbra, Pinhal de Marrocos—Polo II, 3030 Coimbra, Portugal
A. Cavaleiro
Affiliation:
Departamento de Engenharia Mecânica, Faculdade de Ciências e Technologia da Universidade de Coimbra, Centro de Engenharia Mecânica da Universidade de Coimbra, Pinhal de Marrocos—Polo II, 3030 Coimbra, Portugal
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Abstract

Depth-sensing indentation tests were used to determine the hardness of amorphous W–C–Co coatings deposited on different steel and copper substrates. The hardness of the film, Hf, was chosen to be always greater than the hardness of the substrate Hs and within the range Hf/Hs = 2 to 18.5. The influence of the ratio Hf/Hs on the ratio (t/hD)C between the film thickness t and the critical value of the indentation depth (hD)C, for which the substrate starts to deform plastically, was studied. Two independent methods were used to determine (hD)C values. One utilized the differential analysis of the loading part of the indentation curve, and the other was based on the plot of (Hc – Hs)/(Hf − Hs) versus t/(hD), Hc being the measured hardness of the film/substrate composite at a given indentation depth (hD). A good correlation between both methods was found.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1766 - 1772
Copyright
Copyright © Materials Research Society 2000

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