TRIBOLOGICAL PROPERTIES AND ABRASION RESISTANCE THIN FILMS OF TUNGSTEN CARBIDE

1 MÁLEK Václav
Co-authors:
2 MAKOWKA Marcin 3 KORMUNDA Martin 3 RYŠÁNEK Petr
Institutions:
1 Technical University of Liberec, Faculty of Mechanical Engineering, Department of Material Science, Studentska 2, 461 17 Liberec, Czech Republic, EU, vaclav.malek@tul.cz
2 Lodz University of Technology, Faculty of Mechanical Engineering, Institute of Mechanical Engineering, ul. Żeromskiego 116, 90-924 Łódź, Poland, EU, marcin.makowka@p.lodz.pl
3 J.E.Purkinje University, Faculty of Science, Department of Physics, Ceske mladeze 8, 00 96 Ustí nad Labem, Czech Republic, EU, martin.kormunda@ujep.cz, petr.rysanek@ujep.cz
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1372-1376
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
23 views / 10 downloads
Abstract

Tungsten carbide (WC) is in the groups hard materials, which is used for cutting tool. The substrate sample was coated with device PVD. Coatings nc-WC/a-C:H were deposited in a vacuum chamber by magnetron sputtering. This device has four independent planar magnetrons with circular targets. Three targets were made from pure graphite and one form pure tungsten. Tungsten carbide is approximately two times stiffer than steel, with a Young's modulus of approximately 650–700 GPa. At the end of the coating process Ar / methane (Ar 25 sccm / CH4 12.5 sccm) was admitted to chamber, which gets into the surface layer. The parameters of the process influence properties of the thin films were amourphous microstructure, hardness and adhesion to the substrate. The tribological measurements were performed the “ball-on-disc” testing method. Tribological testing (EN1071-13:2010) was performed using a ball made from Si3N4 with a diameter of 5 mm, with a constant load of 10 N at room temperature and humidity of 40 ±2 %. The results were analysed by profilometer and optical microscope.

Keywords: Tungsten carbide, PVD, layers, ball-on-disc
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