Protective effectiveness of a nanocomposite coating with low-friction layers under sliding friction at ambient temperature
Więcej
Ukryj
1
Wroclaw University of Science and Technology
2
Center for Materials Science and Metal Forming, Lukasiewicza 5, 50-371 Wroclaw, Poland
3
GKN Driveline Polska Sp. z o.o. , 56-400 Olesnica, Poland
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SŁOWA KLUCZOWE
DZIEDZINY
STRESZCZENIE
This study evaluates the protective effectiveness of a PVD nanocomposite coating (Alwin XC), consisting of a nanocrystalline chromium aluminum silicon nitride (CrAlSiN) base layer combined with a TiC/C low-friction layer) deposited on Orvar 2M hot-work tool steel under sliding friction conditions at ambient temperature. Tribological tests were carried out using the ball-on-disc method under technically dry friction, with a silicon nitride (Si₃N₄) ceramic ball serving as the counterbody. The tribological behavior of the coated system was directly compared with that of uncoated Orvar 2M steel, with particular emphasis on the quantitative analysis of wear-track geometry. The obtained results were additionally referenced against preliminary tribological data acquired at elevated temperatures, suggesting the possible contribution of tribo-oxidative processes to coating performance. The results demonstrate a pronounced improvement in wear resistance resulting from the application of the Alwin XC coating. For uncoated Orvar 2M steel, the maximum wear-track depth ranged from 14 to 20 µm, with wear areas of approximately 8000–12,000 µm². In contrast, for the Orvar 2M + Alwin XC system, the wear-track depth did not exceed 2–7 µm, while the wear area was limited to 1400–3000 µm². These differences indicate a significant reduction in wear intensity and a fundamental modification of the sliding contact conditions in the presence of the coating. Microscopic analyses confirmed that uncoated steel undergoes intensive abrasive wear accompanied by plastic deformation of the near-surface layer, whereas the Alwin XC coating stabilizes the tribological contact, leading to the formation of shallow and narrow wear tracks. The scientific novelty of this work lies in quantitatively demonstrating that the Alwin XC coating not only reduces wear but also substantially alters the contact geometry by limiting the real contact area, acting as an effective load-bearing layer under ambient-temperature conditions, and suggesting potential tribo-oxidative mechanisms at elevated temperatures.