In the current work, a NiCrAlY and Fe-based alloy are HVOF-sprayed due to the combination of high coating density and customizable coating properties. The oxygen to fuel gas ratio was varied to modify coating defects in a targeted manner. The results demonstrate material dependent defect mechanisms. Further investigations regarded residual stresses, hardness, and electrical conductivity. In particular, the thermal diffusivity proved to be very promising. Moreover, the coatings were compared with previous work on arc-sprayed coatings of similar chemical composition regarding insulation capability.

coating density, coating properties, electrical conductivity, hardness, high-velocity oxyfuel spraying, iron alloys, NiCrAlY alloys, residual stress, thermal diffusivity, thermal insulation
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2023
ASM International
Topics
Residual stress analysis Nickel-chromium alloys High-velocity oxyfuel spray coating Electrical conductivity Hardness Thermal diffusivity
Issue Section:
Novel Coatings
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