Abstract
Abstract Adherent diamond coatings up to ∼30 μm thick have been grown by microwave plasma CVD on WC substrates and their erosive wear properties investigated under high velocity air–sand erosion testing. Coating properties, particularly residual stress and adhesion, 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 of ∼5 based on the results obtained to date. Also films with low residual stress appear to exhibit longer lifetimes under testing. Failure tends to occur catastrophically along the coating–substrate interface. The grain boundaries do not appear to represent an easy route for crack propagation. Their strength appears to be comparable to that of the grains themselves.
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