Effect of Ceramic Particles on Properties of Cold-Sprayed Ni-20Cr+Al2O3 Coatings

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Abstract

Cold spraying is a thermal spray process enabling the production of metallic and metal-ceramic coatings with low porosity and low oxygen content, capable of, e.g., resisting corrosion. The aim of this study was to characterize the microstructural and mechanical properties of cold-sprayed Ni-20Cr+Al2O3 coatings and to clarify the effect of the hard particles on different coating properties. Accordingly, the research focused on the microstructure, denseness (impermeability), adhesion strength, and hardness of the coatings. Scanning electron microscopy (SEM) analysis and corrosion tests were run to gain information on the through-porosity. Ceramic addition in cold-sprayed Ni-20Cr+Al2O3 coatings improved their quality by lowering their porosity. Moreover, hardness was slightly higher than those of cold-sprayed Ni-20Cr coating, indicating a hardening effect by the ceramic particles. The addition of Al2O3 also made it possible to use high gas temperatures without nozzle clogging, which affects coating properties, such as coating thickness, denseness, and hardness.

Keywords

coating structure cold spraying denseness mechanical properties Ni-20Cr+Al2O3 
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Notes

Acknowledgments

The authors like to thank Mr. Werner Krömmer of Linde AG Gas for the spray coatings and for his valuable advice. The project was funded by Finnish Funding Agency for Technology and Innovation (TEKES) and a group of Finnish industrial companies.

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Copyright information

© ASM International 2009

Authors and Affiliations

  1. 1.Department of Materials ScienceTampere University of TechnologyTampereFinland

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