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Effect of powder morphology on the microstructure and properties of cold sprayed Ni coatings

  • A. Góral , W. Żórawski , P. Czaja , L. Lityńska-Dobrzyńska , M. Makrenek and S. Kowalski
Published/Copyright: January 11, 2019
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Abstract

Cold sprayed Ni coatings offer new possibilities for repairing damaged and mis-machined components. The morphology of the powder particles and grain-size distribution have a significant influence on the particles' behaviour during compaction and on the properties of the coating. In this study, two Ni powders with different morphology and grain-size distribution were cold sprayed on a 7075 Al alloy substrate. The first powder, Ni HR, had an irregular spherical shape, whereas the second, Ni E, possessed a dendritic shape. SEM and TEM investigations revealed differences in the microstructure and properties of the Ni cold-sprayed coatings. The coating sprayed using the dendritic powder revealed enhanced mechanical properties and the surface had half the roughness of the Ni coatings deposited using the irregular spheroidal powder.


*Correspondence address, Anna Góral, Ph.D., Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland, Tel.: +48122952868, Fax: +48122952804, E-mail: , Web: www.imim.pl

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Received: 2017-11-13
Accepted: 2018-06-06
Published Online: 2019-01-11
Published in Print: 2019-01-09

© 2019, Carl Hanser Verlag, München

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