Carbon based coatings for applications in friction couples with bearing steel and aluminium alloy

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Carbon based coatings for applications in friction couples with bearing steel and aluminium alloy

Journal Title: Archives of Materials Science and Engineering - Year 2017, Vol 1, Issue 87

Abstract

Purpose: Low friction nc-WC/a-C:H coatings deposited by means of magnetron sputtering provide very good tribological properties in friction couple against hard steels and good adhesion to steel substrates. Nevertheless, it was necessary to elaborate a new type of coatings because the nc-WC/a-C:H one had no use in friction couple against aluminium alloys. Design/methodology/approach: In the paper the WC/a-C:H and (Si, Cr)C/a-C:H coatings were investigated. The coatings were investigated by means of SEM, EDS, in order to obtain thickness, surface morphology and chemical composition of coatings. Tribological properties of deposited coatings were elaborated by means of 'pin-on-disc' method in friction couple against 100Cr6 bearing steel and AlSi alloy. Findings: It was stated that (Si, Cr)C/a-C:H coatings have very good tribological properties in friction couple against bearing steel and AlSi alloy (friction coefficient <0,1). In case of WC/a-C:H coatings, good tribological properties were achieved in friction couple with bearing steel. Both coatings have very low wear rate in investigated friction couples. Research limitations/implications: The (Si,Cr)C/a-C:H coating have a worse quality of adhesion to quenched and tempered Vanadis 23 HS steel substrate in comparison with the nc-WC/a-C:H coating. Resolving this disadvantage can increase potential of application of (Si, Cr)C/a-C:H coatings. Practical implications: Newly developed (Si, Cr)C/a-C:H coating has a greater application potential for modification of surfaces of elements working in friction couples against hardened steels and light alloys like AlSi. Originality/value: There are numerous publications where low friction carbon based coatings were described mostly as a coatings deposited on elements working in friction couples against hard steels. Undertaken tests showed that the newly developed (Si,Cr)C/a- C:H coating can have a broad spectrum of applications in friction couples against different counterbodies, including light Al alloys.

Authors and Affiliations

M. Makówka, B. Wendler

Keywords

Effect of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel

Purpose: The aim of the paper is to determine influence of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel tested at room temperature....

EP ID EP237073
DOI 10.5604/01.3001.0010.5966
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