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Open AccessArticle

Fretting Wear Damage Mechanism of Uranium under Various Atmosphere and Vacuum Conditions

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
Authors to whom correspondence should be addressed.
Materials 2018, 11(4), 607;
Received: 1 March 2018 / Revised: 11 April 2018 / Accepted: 12 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue Deformation, Fatigue and Fracture of Materials)
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 × 10−4 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. View Full-Text
Keywords: fretting wear; wear mechanism; atmosphere; uranium fretting wear; wear mechanism; atmosphere; uranium
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MDPI and ACS Style

Li, Z.; Cai, Z.; Wu, Y.; Meng, X.; Zhang, D. Fretting Wear Damage Mechanism of Uranium under Various Atmosphere and Vacuum Conditions. Materials 2018, 11, 607.

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