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Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

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Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders

W. Żórawski / M. Makrenek / A. Góral
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  • Institute of Metallurgy and Materials Science Polish Academy of Sciences, 25 Reymonta, 30-059 Krakow, Poland
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Published Online: 2017-01-18 | DOI: https://doi.org/10.1515/amm-2016-0297


Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure and composition of WC-12Co nanostructured powder were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Investigations revealed nano grains of WC with the size in the range of 50-500 nm. The nanostructured sprayed coating was analysed by SEM and phase composition was investigated by X-ray diffractometer (XRD). A denser coating structure with higher hardness was observed compared to conventional coating with a small amount of W2C, WC1−x, W and some amorphous phase. Young’s modulus and hardness were determined by depth sensing indentation in HVOF sprayed WC-12Co nanostructured coatings. Results were compared to conventional coatings and the relevance of the nanostructure was analyzed. An indentation size effect was observed on the polished surface and cross-section of both coatings. Data provided by indentation tests at maximum load allow to estimate hardness and elastic modulus. Enhanced nanomechanical properties of conventional coating in comparison to nanostructured one were observed. Nanostructured coatings WC-12Co (N) revealed significantly better corrosion resistance.

Keywords: WC-12Co; HVOF; mechanical properties


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About the article

Published Online: 2017-01-18

Published in Print: 2016-12-01

Citation Information: Archives of Metallurgy and Materials, Volume 61, Issue 4, Pages 1839–1846, ISSN (Online) 2300-1909, DOI: https://doi.org/10.1515/amm-2016-0297.

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© 2016 Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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