Abstract
Cermets coatings are extensively used in energy applications both because of their high wear resistance as required, for example, in components like gas turbine sealants, and because of their specific functionality as required in solar absorbers. So far, high-temperature thermal spraying and physical vapor deposition have traditionally been used to deposit this kind of coatings. In this study, Ni-Al2O3 coatings have been deposited using a Kinetic®3000 cold-spray system starting from Ni and Al2O3 powders blend; five blends have been prepared setting the alumina content in the feedstock to 10, 25, 50, 75, and 90 wt.%. The embedded alumina ranges between a few percent weight up to 16 and 31 wt.%, while the microhardness shows a deep increase from 175 Vickers in the case of pure Ni coatings up to 338 Vickers. The spray and coating growth mechanism have been discussed, with special attention to the fragmentation of the ceramic particles during the impact. Finally, the coating behavior at high temperature was analyzed by oxidation tests performed in air at 520 °C emphasizing a good oxidation resistance that could represent a very promising basis for application in power generation systems.
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The authors would like to thank the Spanish government CICYT through grant MAT2010-18916 and Universidad Rey Juan Carlos through the projects CCG10-URJC/MAT-5550 and “Comportamiento de recubrimientos con aplicaciones a alta temperatura” for financial support. A special thanks to Francisco Sevillano for his job and collaboration.
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Sevillano, F., Poza, P., Múnez, C.J. et al. Cold-Sprayed Ni-Al2O3 Coatings for Applications in Power Generation Industry. J Therm Spray Tech 22, 772–782 (2013). https://doi.org/10.1007/s11666-013-9890-2
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DOI: https://doi.org/10.1007/s11666-013-9890-2