Abstract
A process of plasma spraying combined with machining has been proposed and successfullyemployed to produce alumina coatings of high quality over a plain carbon steel bar. Making useof a clean and active bulk surface which has just been machined is of essence in the proposedclean-cut plasma spraying. Besides, integration of grinding into the spraying, in which thegrinding without coolant is conducted just after spraying, makes a contribution to some extentto raise the bond strength between the coating and the substrate. In order to evaluate thebond strength a scratch test has been performed. When the coated substrate is machined by asharp cutting tool, the scratching force and the damaged area are measured, and a shear bondstrength is estimated. The coating made by the combined method gives higher bond strength andlarger wear resistance as well.
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