碳纤维增强铜钨电触头材料:现状分析及展望

    Carbon Fiber Reinforced Cu-W Contact Materials: Current Situation Analysis and Prospect

    • 摘要: 电触头是断路器等开关设备的核心部件,现役高压开关触头以Cu-W合金材料为主。断路器在开断故障电流或在无功补偿投切时会产生强烈的电弧,导致触头熔焊甚至过早失效,电触头材料的性能直接影响电力系统运行的稳定性与安全性,对其进行改性增强十分必要。合金元素、化合物颗粒等传统增强方式存在增强相与基体相容性差、界面结合强度弱等缺陷;碳纳米管增强使触头材料在极端环境下的性能优异,但制备难度大。而采用高强度、高硬度以及良好自润滑性的碳纤维来增强铜钨电触头材料具有明显的优势。在上述背景下,从Cu-W电触头材料的增强需求与常用方法出发,分析了碳纤维增强Cu-W电触头材料的机理与优势,介绍了碳纤维增强Cu-W电触头材料的制备方法,总结了制备碳纤维增强Cu-W电触头材料的难点并展望了解决措施。

       

      Abstract: Electrical contacts are the core components of circuit breakers and other switching equipment, and the current high-voltage switch contacts are mainly made of Cu-W alloy materials. When the circuit breaker disconnects the fault current or the circuit breaker is cut with reactive power compensation, it will produce a strong arc, resulting in contact fusion welding,even premature failure. The performance of the electric contact material directly affects the stability and safety of the power system operation, so it is very necessary to modify and enhance it. The traditional reinforcement methods such as alloy elements and compound particles have some defects, such as poor compatibility between reinforcement phase and matrix and weak interfacial bonding strength. Carbon nanotube reinforced contact material has excellent performance in extreme environment, but it is difficult to prepare. The use of high strength, high hardness and good self-lubricating carbon fiber to strengthen the Cu-W contact materials has obvious advantages. Under the above background, based on the strengthening needs and common methods of Cu-W electrical contact materials, the mechanism and advantages of carbon fiber reinforced Cu-W electrical contact materials were analyzed, and the preparation method of carbon fiber reinforced Cu-W electrical contact materials was introduced. Finally, the difficulties in preparing carbon fiber reinforced Cu-W electrical contact materials was summarized and the solutions were prospected.

       

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