铜基自润滑复合材料的电弧烧蚀性能研究

Study on arc erosion properties of Cu-based self-lubricating composites

摘要:

本文研究了铜-30vol%石墨、铜-30vol%二硫化钨和铜-30vol%二硫化钼三种铜基自润滑复合材料的抗电弧烧蚀性能。结果表明：石墨熔点较高,在电弧放电瞬间主要以氧化的形式损耗,而二硫化钨和二硫化钼则会在电弧放电造成的高温下发生熔化甚至与铜基体发生化学反应,所以铜-30vol%石墨复合材料的抗电弧烧蚀性能要优于铜-30vol%二硫化钨和铜-30vol%二硫化钼复合材料。铜基自润滑复合材料的电弧烧损机制主要有材料的氧化、熔化飞溅、内部化学反应以及疲劳脱落。

Abstract:

In this study arc erosion properties of Cu-30vol%gaphite, Cu-30vol%WS₂ and Cu-30vol%MoS₂ composites were investigated. The results demonstrated that graphite cannot beSmelted and mainly lost in the form of oxidation during the arc discharge process because of its extremely high melting point. In contrast, WS₂ and MoS₂ were melted and even reacted with Cu matrix due to the high temperature caused by arc discharge. Therefore, the arc erosion resistance of Cu-30vol%gaphite composite was better than those of Cu-30vol%WS₂ and Cu-30vol%MoS₂ composites. The main arc erosion mechanisms of Cu-based self-lubricating composites were found to be oxidation, melting, ejecting, internal chemical reaction and fatigue peeling.