Effect of Thermal Process on High Hardness Zirconia Coating by Means of Gas Tunnel Type Plasma Spraying(Physics, Process, Instruments & Measurements)
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By means of gas tunnel type plasma spraying, a high hardness zirconia coating could be obtained at a short spraying distance. For example, Vickers hardness of zirconia coating was Hv=1050 at L=30mm, when P=20kW. This high hardness coating had a high hardness layer near the surface. The hardness of this high hardness layer became lower after heat treatment. The crystal form of the cubic ZrO_2 of powder was transformed into a tetragonal phase through this plasma spraying. After heat treatment, the angular separation between the two tetragonal peaks was broader and clearer. In this paper, the effect of thermal process (include heat treatment) on the characteristic of such a high hardness zirconia coating was investigated, and the influences on the Vickers hardness and structure of the coating were discussed.
- Transactions of JWRI
Transactions of JWRI 20 (2), 165-171, 1991-12