Abstract
Ni-Mo-Al coatings were deposited onto SAE 1045 steel samples using three commercial systems: one plasma deposition and two flame-spraying deposition. The samples were submitted to lubricated friction and wear tests using two devices: Falex LFW-1 operating in the Timken mode, and optimol-SRV. The load-carrying capacity of the coatings was determined, as well as the variations in the friction coefficient μ and wear volume with normal load. Surface morphological and chemical analyses were carried out on wear scar and debris by scanning electron microscopy and energy dispersive X-ray analysis. All the coatings showed better tribological behaviour than SAE 1045 and hardened SAE 4620 steel under lubricant film failure conditions, while the plasma-deposited coatings showed the best performance. During lubricated friction, material transfer between the contact surfaces took place, probably by adhesion. Dry friction was related to severe abrasion and adhesion. In both regimes, the low cohesion between microconstituents played an important role in the coating surface damage.
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