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为了明确Ti-6Al-4V合金在空间环境下的摩擦磨损失效行为,本文利用中科院兰州化学物理研究所自主研发的空间摩擦学试验系统对Ti-6Al-4V在三种模拟空间环境(高真空、原子氧和紫外辐照)下的摩擦磨损性能进行了系统的研究。采用SEM和EDS对磨损后Ti-6Al-4V和对偶GCr15钢球的形貌和元素面分布进行了分析,揭示了Ti-6Al-4V在模拟空间环境下摩擦磨损失效机理。用XPS分析Ti-6Al-4V在原子氧辐照后表面元素价态的变化。结果表明:Ti-6Al-4V在大气条件下的摩擦磨损机理为磨粒磨损和粘着磨损;在高真空、原子氧和紫外辐照模拟空间环境下的磨损机理为较严重的粘着磨损、磨粒磨损和塑性变形;相比于大气条件下,Ti-6Al-4V在高真空、原子氧和紫外辐照条件下的粘着磨损加剧,摩擦因数增加;Ti-6Al-4V在原子氧辐照后表面发生了氧化。
In order to clarify the friction and wear failure behavior of Ti-6Al-4V alloy in space environment, this paper uses the space tribology test system independently developed by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences to study the effect of Ti-6Al-4V on three simulated space environments (high vacuum, Atomic oxygen and ultraviolet radiation) under the friction and wear properties of a systematic study. The morphology and elemental surface distribution of Ti-6Al-4V and dual GCr15 steel balls after wear were analyzed by SEM and EDS, revealing the failure mechanism of Ti-6Al-4V friction and wear in simulated space environment. XPS analysis of Ti-6Al-4V atom atomic oxygen after the surface element valence changes. The results show that the friction and wear mechanisms of Ti-6Al-4V are abrasive wear and adhesive wear under atmospheric conditions. The wear mechanism of Ti-6Al-4V under severe vacuum, atomic oxygen and ultraviolet irradiation is more serious. Wear and plastic deformation of Ti-6Al-4V compared with the atmospheric conditions, Ti-6Al-4V under high vacuum, atomic oxygen and ultraviolet radiation conditions of wear and tear increase, the friction coefficient increases; Oxidation occurred.