Tribological behavior of a cold-sprayed Cu–MoS₂ composite coating during dry sliding wear

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s11249-016-0646-2
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Name affiliation
  1. National Research Council of Canada. Automotive and Surface Transportation
FormatText, Article
Journal titleTribology Letters
ISSN1023-8883
1573-2711
Volume62
Issue1
Article number9
Pages1–12
SubjectCold spray; Metal matrix composite; Friction; Wear rate; Subsurface microstructure; MoS₂
Abstract
Two cold spray coatings, one pure Cu and the other a Cu–MoS₂ composite coating, were studied for their tribology performance in dry air. It was demonstrated that a small amount of MoS₂ (1.8 ± 0.99 wt%) could significantly decrease coefficient of friction (CoF) from around 0.7 (Cu coating) to 0.14–0.15. MoS₂ patches on the wear track exhibited a lower local CoF, and the main velocity accommodation mechanism was shearing MoS₂-containing debris. Even though the coating wear rates were high in the early sliding (8.61–12.8 nm/cycle in penetration depth during the first 100 cycles), slow wear (0.12–0.22 nm/cycle) over the subsequent sliding was observed. It was also found that the presence of MoS₂ helped to achieve high endurance of the first steady-state CoF. The dynamics of the process, material transfer, and phase transformation were examined using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Raman spectroscopy. The MoS₂ patches developed on the wear track and the counterface served as reservoirs to replenish MoS₂ in the contact and became depleted with sliding. Cross-sectional microstructure revealed by electron channeling contrast imaging technique showed a layer of sliding-induced microstructure, 3–5 µm thick for the Cu–MoS₂ coating, and 10–30 µm thick for the Cu coating
Publication date
PublisherSpringer International Publishing
LanguageEnglish
Peer reviewedYes
Identifier646
NPARC number23000118
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