Abstract
Abstract By addition of a Ni-Cr undercoating to a steel substrate, a ZrO2; coating with high thermal shock endurance was produced. This coating resists to an initial quenching temperature gradient of 1000 K. The plasma spray coating material is 7wt%-CaO stabilized ZrO2 powder. The chemical composition and the thermal expansion coefficient of the base steel, and also the Ni-Cr undercoating were evaluated for thermal shock endurance. The thermal shock endurance of the ZrO2 coatings is enhanced by the (Cr+Co) contents in the steels and by applying a Ni-Cr undercoating. The thermal expansivities of the steels have little influence on the thermal shock endurance. The carbon in the steels deteriorates the bonding of the Ni-Cr undercoating, but does not influence the ZrO2 coatings themselves.
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