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Tribological behavior of cold sprayed Inconel 718 coatings at room and elevated temperatures

机译：冷喷涂的摩擦学行为在室内718涂层718涂层和升高的温度

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摘要

In this study, Inconel 718 coatings were fabricated by high pressure cold spray deposition and the microstructure and tribological properties of the coatings were systematically investigated at both room and elevated temperatures. At the first place, the investigation on the effect of thermal exposure on the surface oxidation of the coatings was conducted in the absence of sliding. It was found that oxides started to form on the coating surface when the ambient temperature was above 500 degrees C. At 600 degrees C, a NiFe2O4 spinel oxide layer spread over the coating surface. Under sliding against an Al2O3 counter ball, oxides started to form on the coating surfaces in contact with the ball when the ambient temperature was above 200 degrees C due to the fact that the frictional and external heat had facilitated the formation of the oxides. Thus, the friction coefficients of the Inconel 718 coatings decreased with the increase of ambient temperatures. However, the wear rates of the coatings increased at 100 degrees C and 200 degrees C compared to those of the coatings tested at room temperature, which was due to the decrease of hardness and severe abrasive wear. When the ambient temperature was further increased to 300 degrees C, a transition in wear mechanism occurred and the wear rates decreased due to the formation and breakage of the surface oxides that could act as lubricants between the counter ball and coating. With further increase of ambient temperature, a 'glaze' layer was formed and grew on the wear tracks, which could act as a protective layer and showed a load-bearing effect that prevented further removal of the coating materials, resulting in an improved wear resistance of the Inconel 718 coatings at elevated temperatures. Therefore, cold sprayed Inconel 718 coatings could be potentially used under wear conditions at elevated temperatures.
机译：在该研究中，通过高压冷喷雾沉积制造了818件涂层，在两个房间和升高的温度下系统地研究了涂层的微观结构和摩擦学性质。首先，在没有滑动的情况下进行了对涂层表面氧化的热暴露对涂层表面氧化的影响的研究。发现当环境温度高于500℃的环境温度高于500℃时，氧化物在涂层表面上开始形成。在600℃下，氧化物氧化物层在涂层表面上扩散。在滑动抵靠Al2O3撞击球下，当由于摩擦和外部热量促进形成氧化物的形成，当环境温度高于200摄氏度时，氧化物在与球接触的涂层表面上形成。因此，随着环境温度的增加，Inconel 718涂层的摩擦系数降低。然而，与在室温下测试的涂层的涂层相比，涂层的磨损率在100℃和200摄氏度上增加，这是由于硬度和严重磨料磨损的降低。当环境温度进一步增加到300℃时，发生磨损机构的过渡并且由于可以充当抗衡球和涂层之间的润滑剂的表面氧化物的形成和破裂，磨损率降低。随着环境温度的进一步增加，形成“釉料”层并在磨损轨道上成长，这可以充当保护层并显示出可防止涂层材料的进一步去除涂层材料的承载效果，从而改善耐磨性在升高的温度下的Inconel 718涂层中。因此，冷喷涂的Inconel 718涂层可能在升高的温度下磨损条件下使用。

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