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

  1. Get@NRC: Tribological behavior of a cold-sprayed Cu–MoS₂ composite coating during dry sliding wear (Opens in a new window)
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Journal titleTribology Letters
Article number9
SubjectCold spray; Metal matrix composite; Friction; Wear rate; Subsurface microstructure; MoS₂
AbstractTwo 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
AffiliationAutomotive and Surface Transportation; National Research Council Canada
Peer reviewedYes
NPARC number23000118
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Record identifier440368ac-a5f9-4580-9bad-3b9dc133dbfe
Record created2016-06-03
Record modified2016-06-03
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