Erosive wear behaviour of thick CVD diamond coatings


Wheeler, D.W. and Wood, R.J.K (1999) Erosive wear behaviour of thick CVD diamond coatings. Wear, 225-229, (1), 523-536. (doi:10.1016/S0043-1648(98)00379-2).

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Description/Abstract

This paper reports work carried out on 60–200 μm thick CVD diamond coatings deposited on tungsten and cemented tungsten carbide substrates. The erosive wear behaviour of these coatings relative to cemented tungsten carbide is described. Erosion tests used quartz silica sand, on average 194 μm in diameter, in air at a velocity of 268 ms−1. The erosion rates and micro-mechanisms, and their effect on coating life are presented as a function of coating thickness and the surface conditions of as-grown or lapped coatings. The eroded surfaces were studied by scanning electron microscopy (SEM) and surface profilometry. Ultrasonic imaging and taper polishing of tested samples were also performed to reveal sub-surface damage and to elucidate its contribution to coating degradation. The results suggest that the samples erode by a gradual chipping of grains in the early stages followed by the accumulation of damage at the coating–substrate interface. It is this latter feature which eventually leads to catastrophic failure of the coating along the interface. These features are discussed in the context of the classical erosion damage features normally exhibited by brittle materials as well as the coating microstructure. The propensity for coating debonding would suggest that improved coating adhesion would further enhance erosive wear behaviour of thick CVD diamond coatings.

Item Type: Article
Additional Information: Special edition: papers presented at the 12th International Conference on Wear of Materials, Atlanta, USA, 25-29 Apr 1999
ISSNs: 0043-1648 (print)
Related URLs:
Keywords: erosion, micro-mechanisms, diamond, coatings
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 21188
Date Deposited: 02 Feb 2007
Last Modified: 27 Mar 2014 18:10
URI: http://eprints.soton.ac.uk/id/eprint/21188

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