MICROSTRUCTURAL CHARACTERIZATION AND WEAR BEHAVIOR OF WC-COCR COATING ON AZ91 MAGNESIUM ALLOY

1 BUCHTÍK Martin
Co-authors:
1 MÁSILKO Jiří 2 VYKLICKÝ Ondřej 2 FILIPENSKÝ Jan 1 WASSERBAUER Jaromír 1 PTÁČEK Petr
Institutions:
1 Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno, Czech Republic, EU, xcbuchtik@fch.vutbr.cz
2 Plasmametal, spol. s.r.o., Tovární 739/1, 643 00 Brno-Chrlice, Czech Republic, EU
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
922-927
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
26 views / 8 downloads
Abstract

This paper includes the microstructural and wear characterization of WC-10Co4Cr coating on AZ91 magnesium alloy. Using the scanning electron microscopy and X-ray diffraction analysis it was determined that the microstructure was formed by WC particles, CoCr matrix, present Co3W3C mixed carbide, W2C, and free carbon. The presence of W2C and free carbon indicates the partial decarburization during the spraying process. The microhardness of HVOF-sprayed coating was 1480 ± 80 HV 0.05, which is approximately 20× higher when compared to AZ91 alloy. The friction coefficient values with the subsequent weight loss of the coating and magnesium substrate were determined. It has been proven that HVOF-sprayed WC-CoCr coating can protect the magnesium substrate from the wear.

Keywords: WC-CoCr, HVOF, AZ91 alloy, microstructure, wear
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