Surface Roughness and Characteristics of High Hardness Zirconia Coating by Means of Gas Tunnel Type Plasma Spraying(Physics, Process, Instruments & Measurements)

概要

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By means of gas tunnel type plasma spraying, a high hardness zirconia coating can be formed at a short spraying distance. This high hardness coating had a hardness layer near the surface. The Vickers hardness of this high hardness layer became lower after thermal process. The crystal form of the tetragonal phase ZrO_2 was not transformed by the thermal process, but the angular separation between the two tetragonal peaks was broader and clearer. In this paper, on the surface layer of such a high hardness zirconia coating, the roughness was investigated, and the effect of spraying condition on the characteristic of roughness was clarified. The relation between the surface roughness of these zirconia coatings and deposit phenomena and the structure of the coating were discussed.
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