Li Zhengyang, Cai Zhenbing, Wu Yanping, Meng Xiandong, Zhang Dongxu
Tribology Research Institute, Key Lab of Advanced Technologies of Materials, Southwest Jiaotong University, Chengdu 610031, China.
China Academy of Engineering and Physics, Mianyang 621900, China.
Materials (Basel). 2018 Apr 16;11(4):607. doi: 10.3390/ma11040607.
A fretting wear experiment with uranium has been performed on a linear reciprocating tribometer with ball-on-disk contact. This study focused on the fretting behavior of the uranium under different atmospheres (Ar, Air (21% O₂ + 78% N₂), and O₂) and vacuum conditions (1.05 and 1 × 10 Pa). Evolution of friction was assessed by coefficient of friction (COF) and friction-dissipated energy. The oxide of the wear surface was evaluated by Raman spectroscopy. The result shows that fretting wear behavior presents strong atmosphere and vacuum condition dependence. With increasing oxygen content, the COF decreases due to abrasive wear and formation of oxide film. The COF in the oxygen condition is at least 0.335, and it has a maximum wear volume of about 1.48 × 10⁷ μm³. However, the COF in a high vacuum condition is maximum about 1.104, and the wear volume is 1.64 × 10⁶ μm³. The COF in the low vacuum condition is very different: it firstly increased and then decreased rapidly to a steady value. It is caused by slight abrasive wear and the formation of tribofilm after thousands of cycles.
在球-盘接触式线性往复摩擦磨损试验机上进行了铀的微动磨损试验。本研究聚焦于铀在不同气氛（氩气、空气（21% O₂ + 78% N₂）和氧气）以及真空条件（1.05 和 1×10 Pa）下的微动行为。通过摩擦系数（COF）和摩擦耗散能量评估摩擦的演变。利用拉曼光谱对磨损表面的氧化物进行了评估。结果表明，微动磨损行为对气氛和真空条件有很强的依赖性。随着氧含量的增加，由于磨粒磨损和氧化膜的形成，摩擦系数降低。氧气条件下的摩擦系数至少为0.335，最大磨损体积约为1.48×10⁷μm³。然而，高真空条件下的摩擦系数最大约为1.104，磨损体积为1.64×10⁶μm³。低真空条件下的摩擦系数差异很大：它先增大，然后迅速下降至稳定值。这是由轻微的磨粒磨损和数千次循环后摩擦膜的形成引起的。
