Abstract
The high hardness zirconia (ZrO 2) coatings could be obtained at an atmospheric pressure by using a gas tunnel type plasma spraying. The characteristics of these high hardness ZrO 2 coatings were investigated. The Vickers hardness of the ZrO 2 coating at a short spraying distance was very high; a high hardness of more than H v=1200 was achieved at the surface side of the coating. The microstructure of the obtained high hardness ZrO 2 coating was also investigated by the microscopic method. And the characteristics of the high hardness ZrO 2 coating was discussed in comparison with that of the coating formed by the conventional type plasma spraying. It was clarified that the ZrO 2 coating of the gas tunnel type was not only much harder but also less porous than that of the conventional type.
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