Morphology and Frictional Characteristics Under Electrical Currents of Al₂O₃/Cu Composites Prepared by Internal Oxidation

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• 作者：Liu Ruihua ; Song Kexing ; Jia Shuguo ; Xu Xiaofeng ; Gao Jianxin ; Guo Xiuhua
• 关键词：Al₂O₃/Cu composite ; internal oxidation ; friction and wear ; surface morphology ; current carrier
• 刊名：Chinese Journal of Aeronautics
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：21
• 期：3
• 页码：281-288
• 全文大小：467 K

文摘

Two Al₂O₃/Cu composites containing 0.24 wt. % Al₂O₃ and 0.60 wt. % Al₂O₃ separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass are investigated and compared. The changes in morphology of the sliding surface and subsurface are examined with scanning electron microscope (SEM) and energy dispersive X-ray spectrum (EDS). The results show that the wear resistance of the Al₂O₃/Cu composites is superior to that of copper under the same conditions. Under a given electrical current, the wear rate of A1₂O₃/Cu composites decreases as the A1₂O₃-content increases. However, the wear rates of the A1₂O₃/Cu composites and copper increase as the sliding speed and pressure increase under dry sliding condition. The main wear mechanisms for Al₂O₃/Cu composites are of abrasion and adhesion; for copper, it is adhesion, although wear by oxidation and electrical erosion can also be observed as the speed and pressure rise.