Abstract
Using a two-roller testing machine, the authors have examined the surface durability of thermally sprayed WC-Cr-Ni cermet coating in lubricated rolling or rolling with sliding contact conditions. In the present investigation, the coating of 20 to 200μm in thickness was formed onto the blasted or ground roller specimens made of a thermally refined carbon steel, an induction hardened carbon steel and a carburized alloy steel by means of the high energy type flame spraying (Hi-HVOF) as well as the conventional high velocity oxygen-fuel flame spraying (HVOF). The WC cermet coated roller finished to a mirror-like condition was mated with the carburized steel roller without coating and a maximum Hertzian stress of PH=1.2 or 1.4GPa was applied in line contact. As a result, it was found that the coating on the blasted substrate roller generally shows a higher durability compared with that on the ground substrate roller and this difference appears more distinctly as the coating thickness decreases. In addition, it was also confirmed that the life to flaking of coated roller is prolonged as the hardness of substrate is raised and the coating thickness increases.
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