M. Hauer, A. Gericke, Lukas Möhrke, W. Krömmer, K. Henkel
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Novel Fe- and Ni-Based HVOF-Sprayed Coatings Compared to APS-Sprayed TBC Systems for Improved Thermal Insulation Capabilities in Cryogenic Environments
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.
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