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Gra./Cu和CNTs/Cu復(fù)合材料的截流值與陰極斑點研究
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國家重點基礎(chǔ)研究發(fā)展計劃“973”項目 (2007CB607603)


Chopping Current and Cathode Spot Movements of Gra./Cu and CNTs/Cu Composites
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    摘要:

    采用粉末冶金方法制備石墨銅復(fù)合材料(Gra./Cu)和碳納米管銅復(fù)合材料(CNTs/Cu)，研究2種銅基復(fù)合材料的真空電弧截流現(xiàn)象和陰極斑點特性。結(jié)果表明，與Gra./Cu相比，CNTs/Cu在真空放電過程中電弧更加穩(wěn)定，且分散性好，截流值?。辉谡龑﹃枠O處CNTs/Cu的真空電弧燒蝕坑明顯比Gra./Cu的細小，灼痕直徑約為0.1~5 μm，分布面積也較小，而Gra./Cu的灼痕直徑為10~100 μm；兩者的相同之處在于，在電擊穿過程中陰極斑點的運動呈一種隨機的、突變式的跳躍，而且選擇性發(fā)生在Cu相上，Cu相被消耗?？傊?，CNTs/Cu比Gra./Cu具有更高的耐電弧燒蝕能力，CNTs的加入可以有效地增加銅基復(fù)合材料的電弧穩(wěn)定性和降低截流值

    Abstract:

    Gra./Cu composites and CNTs/Cu composites were prepared by powder metallurgy. Chopping current and cathode spot movements of the 2 kinds of Cu matrix composites in vacuum were investigated. The results show that the vacuum arc of CNTs/Cu is more stable and dispersive, and the chopping current is less than that of Gra./Cu. For CNTs/Cu the size of cathode spot craters is 0.1-5 μm in diameter, while for Gra./Cu is between 10 and 100 μm. The common characteristics are that cathode spot initiates selectively on the Cu phases and walks randomly on the surface of the Cu matrix composites. It is concluded that CNTs/Cu has an higher arc erosion resistance than Gra./Cu, and CNTs can effectively increase stability and lower chopping current of the Cu matrix composites.

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許 瑋,胡 銳,劉懿文,李金山,傅恒志. Gra./Cu和CNTs/Cu復(fù)合材料的截流值與陰極斑點研究[J].稀有金屬材料與工程,2011,40(9):1616~1620.[Xu Wei, Xu Wei, Liu Yiwen, Li Jinshan, Fu Hengzhi. Chopping Current and Cathode Spot Movements of Gra./Cu and CNTs/Cu Composites[J]. Rare Metal Materials and Engineering,2011,40(9):1616~1620.]
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  • 收稿日期:2010-09-18
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