WEAR AND FRICTION MEASUREMENTS ON CVD COATED CARBON ALLOY BEARING SURFACES

A series of ball-on-disc wear and friction measurements were made for surfaces which have a chemical vapour deposition carbon silicon alloy layer on a carbon substrate (fine grain POCO graphite). Nitrogen ion i rradiation was used to improve the wear resistance of the carbon alloy surface. For comparison, measurements were also taken for alumina aga inst alumina. It was found that the lowest friction coefficient and lo west wear occurred for ion irradiated coated samples containing 4% Si in the alloy and that the performance was superior to that of alumina.