Reactive Plasma Spraying (RPS) is one of several new plasma spray processes. Some findings have been published on this technology, hi these reports, only metal powders, such as Ti, Cr and Si, were used for the fabrication of coatings composed of metal and non-oxide ceramics. When an oxide powder is used for starting materials to fabricate metal or non-ceramic coating, it is important to understand the reduction process of the oxide during spraying as well as the reaction among the powder, plasma and atmospheric gas. In this study, the effects of amounts and kinds of plasma and chamber gas, chamber pressure and the addition of carbon powder on the reduction of plasma sprayed TiO2 were investigated.

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