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The tribological performance at elevated temperatures of MoNbN-Ag coatings
Applied Surface Science ( IF 6.3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.apsusc.2020.145372
Xuan Dai , Mao Wen , Jia Wang , Xiangru Cui , Xin Wang , Kan Zhang

Abstract Sliding components, such as reciprocating and rolling contact bearings of aero engines, are rapidly heated by viscous friction when aerospace vehicles are working at high Mach number. Repeated friction and wear at high temperatures can easily cause deformation or even breakage of the sliding parts, thereby reducing the service life of the materials. Therefore, the new generation of materials for components requires not only excellent mechanical properties, but also reliable tribological properties at elevated temperatures. In this work, based on the tough yet hard ternary MoNbN solid solution, we designed and synthesized solute structure MoNbAgN and nanocomposite MoNbN/Ag coatings. These Ag-containing coatings exhibit a lower friction coefficient than the pure MoNbN coating at temperatures between room temperature (RT) and 800 °C. The nanocomposite MoNbN/Ag coating presents the lowest friction coefficient in the middle-low temperature range (RT-450 °C), while the solute structure MoNbAgN coating exhibits the best friction coefficient in the middle-high temperature range (450–700 °C). In the high temperature range (700 °C and above), the solute structure MoNbAgN and nanocomposite MoNbN/Ag coatings have similar friction coefficients. The different tribological behaviors of these coatings can be ascribed to the different lubrication products and wear mechanisms at different temperature ranges. The manufacture of Ag-containing transition metal nitride coatings represents a new approach towards the realization of low friction at elevated temperatures.

中文翻译:

MoNbN-Ag 涂层在高温下的摩擦学性能

摘要 航空航天飞行器在高马赫数下工作时,滑动部件,如航空发动机往复轴承和滚动轴承等,会因粘滞摩擦而迅速升温。在高温下反复摩擦磨损,容易造成滑动件变形甚至断裂,从而降低材料的使用寿命。因此,新一代部件材料不仅需要出色的机械性能,还需要在高温下可靠的摩擦学性能。在这项工作中,我们基于坚韧而坚硬的三元 MoNbN 固溶体,设计并合成了溶质结构的 MoNbAgN 和纳米复合 MoNbN/Ag 涂层。这些含银涂层在室温 (RT) 和 800 °C 之间的温度下表现出比纯 MoNbN 涂层更低的摩擦系数。纳米复合MoNbN/Ag涂层在中低温范围(RT-450°C)表现出最低的摩擦系数,而溶质结构的MoNbAgN涂层在中高温范围(450-700°C)表现出最好的摩擦系数)。在高温范围(700 °C 及以上),溶质结构 MoNbAgN 和纳米复合 MoNbN/Ag 涂层具有相似的摩擦系数。这些涂层的不同摩擦学行为可归因于不同温度范围内的不同润滑产品和磨损机制。含银过渡金属氮化物涂层的制造代表了一种在高温下实现低摩擦的新方法。而溶质结构的 MoNbAgN 涂层在中高温范围 (450–700 °C) 表现出最佳摩擦系数。在高温范围(700 °C 及以上),溶质结构 MoNbAgN 和纳米复合 MoNbN/Ag 涂层具有相似的摩擦系数。这些涂层的不同摩擦学行为可归因于不同温度范围内的不同润滑产品和磨损机制。含银过渡金属氮化物涂层的制造代表了一种在高温下实现低摩擦的新方法。而溶质结构的 MoNbAgN 涂层在中高温范围 (450–700 °C) 表现出最佳摩擦系数。在高温范围(700 °C 及以上),溶质结构 MoNbAgN 和纳米复合 MoNbN/Ag 涂层具有相似的摩擦系数。这些涂层的不同摩擦学行为可归因于不同温度范围内的不同润滑产品和磨损机制。含银过渡金属氮化物涂层的制造代表了一种在高温下实现低摩擦的新方法。溶质结构 MoNbAgN 和纳米复合材料 MoNbN/Ag 涂层具有相似的摩擦系数。这些涂层的不同摩擦学行为可归因于不同温度范围内的不同润滑产品和磨损机制。含银过渡金属氮化物涂层的制造代表了一种在高温下实现低摩擦的新方法。溶质结构 MoNbAgN 和纳米复合材料 MoNbN/Ag 涂层具有相似的摩擦系数。这些涂层的不同摩擦学行为可归因于不同温度范围下的不同润滑产品和磨损机制。含银过渡金属氮化物涂层的制造代表了一种在高温下实现低摩擦的新方法。
更新日期:2020-04-01
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