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Deposition of Multilayer Nanostructured Coating Cr/(Cr/a-C)ml on Alloy Steels
Boyan Dochev1, Yavor Sofronov2, Valentin Mishev3
1Department of Mechanics, Faculty of Mechanical Engineering, Technical University of Sofia-Branch Plovdiv, 4000 Plovdiv, Bulgaria.
Abstract:
A chromium/amorphous carbon (Cr/(Cr/a-C)ml) nanostructured multilayer coating with a chromium sublayer was deposited on 42CrMo4 (1.7225,BDS EN ISO 683-2:2018), 100Cr6 (1.3505, BDS EN ISO 683-17:2024), and HS18-0-1 (1.3355, BDS EN ISO 4957:2018) alloy steels, selected for their use in contact-loaded components subjected to cyclic fatigue and intense wear. The coating was sputter deposited by MF pulsed magnetron sputtering under consistent process parameters. The resulting coating, approximately 1.8 μm thick, can significantly enhance the service life of these components. Adhesion was evaluated via the Daimler-Benz test, while coating homogeneity was confirmed through energy-dispersive spectroscopy, revealing a consistent chemical composition across sample surfaces. Raman spectroscopy indicated a high sp3/sp2 ratio, confirming a dominant diamond-like carbon structure. Nanoindentation measurements verified the coating's hardness, aligning with the observed structural properties. These results validate the process parameters for depositing a Cr/(Cr/a-C)ml coating on these alloy steels, achieving this study's objectives.
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