【摘 要】
：
Arc erosion exists on such tribo-electric contact pairs as high voltage switches and railway pantograph, which will bring serious surface damage including oxidation and materials melting. The characte
【机 构】
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National united engineering laboratory for advanced bearing tribology, Henan University of Scien ce
【出 处】
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第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Arc erosion exists on such tribo-electric contact pairs as high voltage switches and railway pantograph, which will bring serious surface damage including oxidation and materials melting. The characters of arc and the material protection method was reported in this paper. The research was carrayed out on a homemade pin-on-disk tribometer equiped with a high-speed camera. When the Load (P)-Velosity (V)-Current (I) exceeded certain critical conditions, arc could form between the rough sliding surface. The combination, seperation and extinguish of the arc could be observed, and it skippped or jumped along the sliding direction, finally the arc expanded at the moment of leaving sliding surface. Consequntly, material damage showed an uneven distribution along sliding surface. Arc presents pulsating characteristics in sliding process, and this might be the main reason for fluctuation of dyn mic friction and dyn mic current. We suggested that the formation of arc relies on the concentration of stress-current-heat on the rough asperity. To protect the material from arc erosion, Cu/MoS2 and Cu/C composites were developed, it was found that the addation of C second phase can decrease the wear rate and friction coefficient significantly especially under high speed and large current. EDX and 3D imaging showd that the a continuous- selfgenerating-conductive-lubricative C tribofilm formed on the contact surface, which can improve the wear resistanc and conductivity together.
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