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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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Abstract

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.

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Details

  • CRID
    1573950402045918208
  • NII Article ID
    110006486948
  • NII Book ID
    AA00867058
  • ISSN
    03874508
  • Text Lang
    en
  • Data Source
    • CiNii Articles

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