Fe-based amorphous coatings have been widely used for various industrial applications due to some excellent characteristics such as high hardness, high strength and high corrosion resistance. However, the poor oxidation resistance greatly limits their application in the field of high-temperature friction and wear. Compared with a Fe-based amorphous coating, a Mo-based amorphous coating is expected to have superior anti-wear performance at elevated temperatures. In this study, Mo- and Fe-based amorphous coatings were deposited by the supersonic atmospheric plasma spraying (SAPS) method. The microstructure and sliding wear behavior of the coatings were comparatively studied. It was found that the wear resistance of the Mo-based amorphous coating was higher than that of the Fe-based amorphous coating although the hardness of the former was a little lower than that of the latter. As the temperature increased to 250 °C, the weak bonding of the inter-splat interface and the formation of hard α-Fe₂O₃ debris aggravated the three-body abrasive wear and therefore worsened the tribological responses of the coatings. With the increase of temperature, the wear mechanism of the Mo- and the Fe-based amorphous coatings gradually transformed from dominate fatigue wear, with abrasive wear as a secondary mechanism, to dominate abrasive wear, accompanied by oxidation wear.

Graphical Abstract

中文翻译：

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超音速大气等离子喷涂钼/铁基非晶涂层的微观结构和摩擦学行为

铁基非晶涂层由于具有高硬度、高强度和高耐腐蚀性等优异特性，已广泛用于各种工业应用。然而，较差的抗氧化性极大地限制了它们在高温摩擦磨损领域的应用。与铁基非晶涂层相比，钼基非晶涂层有望在高温下具有优异的抗磨损性能。在这项研究中，通过超音速大气等离子喷涂 (SAPS) 方法沉积了 Mo 和 Fe 基非晶涂层。对比研究了涂层的显微组织和滑动磨损行为。结果表明，钼基非晶涂层的耐磨性高于铁基非晶涂层，但前者的硬度略低于后者。随着温度升高到 250 ℃，片间界面的弱结合和硬质 α-Fe 的形成₂ O ₃碎屑加剧了三体磨粒磨损，从而恶化了涂层的摩擦学响应。随着温度的升高，Mo基和Fe基非晶涂层的磨损机制逐渐从以磨粒磨损为主的疲劳磨损为主，向以磨粒磨损为主，并伴有氧化磨损的方向转变。

图形概要