Microstructure and Abrasion Wear Resistance of Thermally Sprayed Cermet Coatings

Ion-Dragos Utu; Iosif Hulka; Viorel-Aurel Serban

doi:10.3139/120.110402

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Microstructure and Abrasion Wear Resistance of Thermally Sprayed Cermet Coatings

Ion-Dragos Utu , Iosif Hulka und Viorel-Aurel Serban

Veröffentlicht/Copyright: 26. Mai 2013

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Abstract

WC/10Co4Cr and WC/20CrC7Ni powders were sprayed onto the surface of low-carbon steel substrates using the high velocity oxygen fuel (HVOF) spraying method. Microstructure of the obtained coatings was evaluated by scanning electron microscopy (SEM). X-ray diffraction (XRD) analysis as well as hardness and porosity testing were performed on the samples. The abrasion wear resistance of the coatings was determined using the rubber wheel abrasion test. The mass loss rate (mg/h) of the samples was measured and the test results showed that the WC-CrC-Ni coating has better abrasion wear properties than the WC-CoCr coating.

Kurzfassung

WC/10Co4Cr und WC/20CrC7Ni Pulver wurden auf die Oberfläche von Stählen mit nierdigem Kohlenstoffgehalt mittels Hochgeschwindigkeitsflammspritzen (high velocity oxygenfuel (HVOF)) aufgebracht. Die Mikrostruktur der Beschichtungen wurde rasterelektronenmikroskopisch evaluiert. Röntgendiffraktionsanalysen sowie Härte- und Porösitätsmessungen wurden ebenfalls an den Proben durchgeführt. Der abrasive Verschleißwiderstand der Beschichtungen wurde mittels des Gummischeiben-Tests bestimmt. Die Massenverlustrate (mg/h) der Proben wurde gemessen und die Versuchsergebnisse zeigten, dass die WC-CrC-Ni Beschichtung bessere abrasive Verschleißeigenschaften aufweist als die WC-CoCr Beschichtung.

Ion-Dragos Utu, born 1978, had graduated from “Politehnica” University of Timisoara, Romania, as bachelor and PhD and is currently lector in the department of Materials and Manufacturing Engineering in the same institution being involved in the field of Material Science and Surface Engineering. He had developed remarkable research and teaching activity in Romania, as DAAD and is SOCRATES fellow in the University of Applied Sciences Gelsenkirchen, Germany.

Iosif Hulka, born 1985, graduated from “Politehnica” University of Timisoara, Romania, as bachelor and is currently PhD student in the department of Materials and Manufacturing Engineering.

Viorel-Aurel Serban, born 1954, graduated from “Politehnica” University of Timisoara, Romania, as bachelor as well as PhD and is currently professor of Materials Science. He is the rector of the “Politehnica” University of Timisoara. He had developed a remarkable research and teaching activity in Romania and as SOCRATES fellow in the University of Applied Sciences Gelsenkirchen, Germany and L’Institut Universitaire de Technologie A de Lille, France.

References

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Published Online: 2013-05-26

Published in Print: 2013-01-01

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https://doi.org/10.3139/120.110402