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純石墨和銅-石墨的陰極斑點(diǎn)與截流值研究
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國(guó)家自然科學(xué)基金(50702045, 50871078)和高等學(xué)校學(xué)科創(chuàng)新引智計(jì)劃資助(B08040)


Cathode Spot Movements and Chopping Current of Pure Graphite and Copper-Graphite in Vacuum
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    摘要:

    研究了純石墨和銅-石墨材料的陰極斑點(diǎn)的特性及真空電弧截流現(xiàn)象。發(fā)現(xiàn)純石墨的陰極斑點(diǎn)呈現(xiàn)隨機(jī)運(yùn)動(dòng)的特點(diǎn)，斑點(diǎn)的直徑小于3 μm，陰極斑點(diǎn)每次運(yùn)動(dòng)的距離約為陰極斑點(diǎn)的半徑。而銅-石墨的陰極斑點(diǎn)的運(yùn)動(dòng)與Cu相息息相關(guān)，它選擇性的發(fā)生在Cu相上，陰極斑點(diǎn)的大小取決于Cu相的大小，陰極斑點(diǎn)的運(yùn)動(dòng)距離為Cu相之間的距離。同時(shí)，銅-石墨的真空電弧截流值1.18 A，遠(yuǎn)遠(yuǎn)大于純石墨的截流值，這主要是由于兩種材料不同的陰極斑點(diǎn)運(yùn)動(dòng)特性引起的

    Abstract:

    In the paper, the cathode spot movements and chopping current of pure graphite and copper-impregnated metallized graphite (Cu-C) in vacuum were investigated. It can be found that cathode spot movements produce an arc erosion pattern composed of a large number of craters with varying distances between them. The size of the craters is less than 3 μm in diameter. This pattern indicates that the cathode spot walk randomly on the surface. Whereas, cathode spots initiated selectively on the Cu phases in Cu-C materials. The diameter of the cathode spots depends on the dimension of the Cu phases and the displacement of a cathode spot moving is equal to the distance between the Cu phases. Meanwhile, the chopping current of Cu-C is 1.18 A, far larger than that of pure graphite. The phenomenon can be explained by the different characteristics of the cathode spot movement

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張程煜,喬生儒,楊志懋,王亞平.純石墨和銅-石墨的陰極斑點(diǎn)與截流值研究[J].稀有金屬材料與工程,2009,38(3):488~491.[Zhang Chengyu, Qiao Shengru, Yang Zhimao, Wang Yaping. Cathode Spot Movements and Chopping Current of Pure Graphite and Copper-Graphite in Vacuum[J]. Rare Metal Materials and Engineering,2009,38(3):488~491.]
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  • 收稿日期:2008-02-28
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