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Growth and Erosive Wear Properties of MPCVD Diamond Coatings on Sintered Tungsten Carbide Substrates

Published online by Cambridge University Press:  10 February 2011

S. Amirhaghi ,
H. S. Reehal ,
R. J. K. Wood  and
D. W. Wheeler
S. Amirhaghi
Affiliation:
School of Electrical & Electronic Engineering, South Bank University, London, SEI OAA, UK
H. S. Reehal
Affiliation:
School of Electrical & Electronic Engineering, South Bank University, London, SEI OAA, UK
R. J. K. Wood
Affiliation:
Department of Mechanical Engineering, University of Southampton, S017 lBJ, UK
D. W. Wheeler
Affiliation:
Department of Mechanical Engineering, University of Southampton, S017 lBJ, UK
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Abstract

Adherent diamond coatings up to ∼35 um thick have been grown by microwave plasma CVD (MPCVD) on sintered tungsten carbide (WC) substrates and their erosive wear properties investigated under high velocity air-sand erosion testing. Two different sintered tungsten carbide (WC) substrates have been investigated and compared, the binder being either 6%Co or 5%Ni by weight. Coating properties are sensitive functions of surface pre-treatment and deposition procedures. Adherent coatings offer significantly better erosion resistance compared to uncoated substrates, with the erosion rate being lower by up to a factor between ∼5 and 20 for particle test velocities of 148 ms-1 and 63 ms-1 respectively. Films with low residual stress appear to exhibit longer times to failure which tends to occur catastrophically along the coating-substrate interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 555: Symposium OO – Properties and Processing of Vapor-Deposited Coatings , 1998 , 395
Copyright
Copyright © Materials Research Society 1999

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