Abstract
The present paper describes the erosion of 60 μ m thick diamond coatings on tungsten, 600 μ m thick free standing diamond brazed to tungsten carbide and two grades of cemented tungsten carbide and stainless steel type 316. The erosion rate of the diamond samples was between 12 and 30 times lower than that of tungsten carbide at a particle velocity of 268 m s-1. Moreover, the diamond coating displayed an erosion resistance approximately 2·4 times higher than the brazed diamond. However, pinholes were observed on the 60 μ m thick coating, which were not seen on the thicker diamond. Scanning acoustic microscopy showed these pinholes to be formed on regions of debonded coating and, therefore, they provide a visual indication of coating debonding, which eventually leads to the catastrophic failure of the coating. The mass loss associated with the formation of pinholes has been estimated to account for less than 5% of the total mass loss. Therefore, the coating life or time to failure tF rather than the volumetric erosion rate may be a more useful parameter by which the performance of different coatings can be compared.
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