Functionally Graded Zirconia Composite Coatings Formed by Gas Tunnel Type Plasma Spraying(Materials, Metallurgy & Weldability)

概要

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The zirconia-alumina (ZrO_2-Al_2O_3) composite coating formed by gas tunnel type plasma spraying at short spraying distances, also has a high hardness layer at the surface side of the coating. The Vickers hardness (Hv=1300) of the ZrO_2 composite coating is much higher than a zirconia (ZrO_2) coating, and the graded functionality becomes large. In this paper, the graded functionality of such high hardness ZrO_2 and its composite coating in the case of different spraying conditions is investigated. The enhancement of the graded functionality of such composite coatings is discussed. For these composite coatings, the Vickers hardness of the high hardness layer near the coating surface becomes higher with an increase in the traverse number of plasma spraying. In the case of large traverse numbers, the hardness distribution is much smoother, and the graded functionality is improved. The microstructure of this composite coating has a distribution of embedded thin ZrO_2 splats in a Al_2O_3 matrix, with parallel alignment of the splats relative to the substrate surface.
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