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Modeling of Thermal Stresses in Composite Diamond Coatings and Mechanisms of Improvement of Adhesion

Published online by Cambridge University Press:  21 February 2011

W. D. Fan ,
K. Jagannadham  and
J. Narayan
W. D. Fan
Affiliation:
North Carolina State University, Department of Materials Science & Engineering, Raleigh, NC 27695–7916
K. Jagannadham
Affiliation:
North Carolina State University, Department of Materials Science & Engineering, Raleigh, NC 27695–7916
J. Narayan
Affiliation:
North Carolina State University, Department of Materials Science & Engineering, Raleigh, NC 27695–7916
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Abstract

Thermal stress influences adhesion of many coatings applied on tool substrates. Management of thermal stresses is important for improvement of coatings and tool life. We have shown that stresses can be controlled by developing a composite layer of diamond with carbides and nitrides such as TiC or TiN. We have modeled the thermal stresses in these composite diamond coatings using finite element analysis. The composite diamond coatings consist of a discontinuous layer of diamond with an embedded layer of TiC or TiN, and a top layer of continuous diamond. For comparison, a single layer of diamond coating has also been used. The thermal stresses in these coatings on WC(Co) and Si3N4 tool substrates were calculated. Results show that the thermal stresses at the interface between the coatings and the substrate are relaxed after introducing the composite layers. This stress relaxation is responsible for the improvement of the adhesion of composite coatings.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 356: Symposium B2 – Thin Films: Stresses and Mechanical Properties V , 1994 , 847
Copyright
Copyright © Materials Research Society 1995

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