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Vacuum Tribological Behaviour of Self-Lubricating Quasicrystalline Composite

机译：自润滑准晶复合材料的真空摩擦学行为

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摘要

High-temperature-resistant self-lubricating coatings are needed in space vehicles for components that operate at high temperatures and/or under vacuum. Thick composite lubricant coatings containing quasicrystalline alloys as the hard phase for wear resistance can be deposited by a thermal spray technique. The coatings also contain lubricating materials (silver and BaF_2-CaF_2 eutectic) and NiCr as the tough component. This paper describes the vacuum tribological properties of TH103, a coating of this type, with a very good microstructural quality. The coating was deposited by high-velocity oxygen fuel spraying and tested under vacuum using a pin-on-disc tribometer. Different loads, linear speeds, and pin materials were studied. The pin scars and disc wear tracks were characterised using a combination of scanning electron microscopy and energy dispersive spectrometry. A minimum mean steady friction coefficient of 0.32 was obtained when employing an X750 Ni superalloy pin in vacuum conditions under 10 N load and 15 cm/s linear speed, showing moderate wear of the disc and low wear of the pin.
机译：在航天器中，对于在高温和/或真空下运行的组件，需要使用耐高温的自润滑涂层。可以通过热喷涂技术沉积包含准晶合金作为耐磨性硬质相的厚复合润滑剂涂层。涂层还包含润滑材料（银和BaF_2-CaF_2共晶）和NiCr作为坚韧成分。本文介绍了TH103的真空摩擦学性能，这种涂层具有非常好的微观结构质量。通过高速氧气燃料喷雾沉积涂层，并使用销钉盘式摩擦计在真空下进行测试。研究了不同的载荷，线速度和销材料。使用扫描电子显微镜和能量色散光谱法对销疤痕和光盘磨损轨迹进行了表征。当在10 N负载和15 cm / s线速度的真空条件下使用X750 Ni高温合金销时，获得的最小平均稳态摩擦系数为0.32，这表明圆盘的磨损适中，销的磨损低。

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