Due to the nonsymmetric distribution of the particle plume in conventional plasma spraying, significant influence of the gun scanning pattern can appear in the structure of the coatings obtained. In this study, three scanning patterns are used to deposit YSZ powder by means of air plasma spraying. Cross-sections of the coatings are examined and interfacial fracture toughness and hot corrosion tests are conducted. Improvements in coating adhesion and corrosion resistance were obtained by modifying the scanning pattern of the gun to decrease the possibility of horizontal weak bonding between spray passes.

air plasma spraying, gun scanning pattern, hot corrosion testing, interfacial fracture toughness, scanning pattern, yttria-stabilized zirconia
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2019
ASM International
Topics
Hot corrosion Yttria-stabilized zirconia Plasma spray coating Interfacial bond strength
Issue Section:
Materials and Technology
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