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.

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