弓网振幅对纯碳及浸金属碳滑板载流摩擦磨损性能的影响  

Effect of Vibration Amplitude of Pantograph on Tribological Behavior of Pure Carbon and Metal-impregnated Carbon Strips with Electric Current

作　　者：陈伟[1] 陈光雄[1] 李红[1] 周培勇[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室摩擦学研究所,四川成都610031

出　　处：《润滑与密封》2015年第9期25-29,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(U1234202);四川省科技支撑计划项目(2011FZ0052)

摘　　要：应用环-块式摩擦磨损试验机研究不同弓网振动幅值下纯碳/铜合金和浸金属碳/铜合金2种摩擦副的载流摩擦磨损行为。试验结果表明:弓网之间在不间断地发生近似正弦规律的振动,2种摩擦副的电弧功率都随着振动幅值的增大呈现先增大后减小的趋势,纯碳滑块更容易发生起弧现象,电弧功率更大;2种摩擦副的摩擦因数都随着振动幅值的增大而减小,浸金属碳有更好的耐磨性。使用扫描电镜对滑块的磨损形貌进行观察,结果表明:在一定范围内,随着振动幅值的增大,电弧对纯碳和浸金属碳2种滑块材料的烧蚀程度均加剧;纯碳滑块电弧侵蚀的表现形式为烧蚀坑和热应力裂纹,浸金属碳滑块电弧侵蚀的表现形式为犁沟、材料剥离和烧蚀麻点。Friction and wear behaviors of two friction couples, the pure carbon/copper alloy contact wire and the metal-impregnated carbon/copper alloy contact wire were studied experimentally on a ring-on-block friction wear tester under different vibration amplitudes.The test results indicate that an approximate sinusoidal vibration of the strip occurs continuously.The are discharge power eonsumption of two friction couples is firstly increased and then decreased with the increasing of vibration amplitude, and the pure carbon strip easily creates arc discharge,which has a higher arc power consumption.The friction coefficient of two friction couples is decreased with the increasing of vibration amplitude, and metal-impregnated carbon has good wear resistance than pure carbon.SEM observation of the worn surfaces of the strips shows that arc erosions of pure carbon and metal-impregnated carbon are aggravated with increasing vibration amplitude within a certain range.Erosion pits and thermal stress crackings are two main arc erosion mechanisms of the pure carbon strip.A large number of furrows, pittings and spalling layers can be observed on the worn surface of the metal-impregnated carbon strip.

关 键 词：振动幅值 摩擦 磨损 电弧 

分 类 号：TH117[机械工程—机械设计及理论]