This study aims to address the issues of lubrication failure and poor wear resistance that traditional coatings often exhibit under service operating conditions.
A textured FeCoCrAlCuNi high-entropy alloy (HEA) coating was fabricated on bearing surface via a combination of surface texturing and plasma spraying, and its properties including phase composition, microstructure, elemental distribution, hardness and tribological properties were characterized by using X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy as well as friction and wear tester.
The textured FeCoCrAlCuNi HEA coating was composed of FCC and BCC phases. The interfacial bonding strength depends on the mechanical interlocking, and the average hardness was 266 HV about 1.2 times that of substrate, while the wear rate was reduced to two-thirds of that of substrate. A transition in the wear mechanism from abrasive to fatigue wear with varying loads, whereas the wear resistance was governed by a synergistic effect between in-situ formed Al2O3/Cr2O3 oxide films and surface texturing.
The tribological properties of the textured FeCoCrAlCuNi HEA coating were significantly improved by improving interfacial bonding strength, regulating lubrication behavior and inducing the formation of protective oxide film. An effective strategy for designing wear-resistant coatings under operating conditions were provided by this work.
The peer review history for this article is available at: Link to the cited article.
