Properties of Functionally Graded Zirconia Coating by Gas Tunnel Type Plasma Spraying

The one problem of zirconia (ZrO₂) coatings is control of the porosity, because the functionality of wear resistance, corrosion resistance, and so on are required for their application in the extreme environment. In this study, a high hardness and dense ZrO₂ coatings is formed by a gas tunnel type plasma spraying under the condition of a short spraying distance. The properties of this ZrO₂ coating formed are investigated about coating qualities, such as Vickers hardness characteristics, wear characteristic, etc. The graded functionality of this coating is clarified by the coating qualities.