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納米晶鎢銅合金表面上不尋常的電弧分布及電擊穿機(jī)理
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TG146.411

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Supported by the National Natural Science Foundation of China（Grant No. 50071043） and Natural Science Foundation of Shaanxi Province（Grant No. 2004E1 05）


Unusual Arc Distribution on Surface and Electrical Breakdown Mechanism of Nanocrystalline Tungsten Copper Alloy
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    摘要:

    在真空電爐中利用機(jī)械合金化和熱壓燒結(jié)法制備出納米晶塊體鎢銅合金。在進(jìn)行電擊穿實(shí)驗(yàn)時(shí)，電弧在其表面出現(xiàn)了分散現(xiàn)象，明顯不同于相應(yīng)傳統(tǒng)材料電弧集中在局部的現(xiàn)象。這是由于納米材料在電擊穿時(shí)由于較低的逸出功、大量晶界的存在和納米尺度的粒子能窄化鎢銅界面的勢(shì)壘而誘發(fā)大量電子發(fā)射所致。

    Abstract:

    Nanostructured bulk of W-Cu alloy was prepared by mechanical alloying and hot pressed sintering. The nanostructured W-Cu material shows the characteristic of the spreading electric arcs, and the commercially used W-Cu alloy exhibits the characteristic of the localized arcs during the electric breakdown. The effect of nanostructured W-Cu alloy is caused by a larger number of electrons emitted during the discharge with a low electron work function, and highly conductive grain boundaries and many nano-metre-scale grains could narrow the potential barrier at the tungsten-copper interface.

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陳文革 邢力謙 李金山.納米晶鎢銅合金表面上不尋常的電弧分布及電擊穿機(jī)理[J].稀有金屬材料與工程,2007,36(3):463~466.[Chen Wenge, Xing Liqian, Li Jinshan. Unusual Arc Distribution on Surface and Electrical Breakdown Mechanism of Nanocrystalline Tungsten Copper Alloy[J]. Rare Metal Materials and Engineering,2007,36(3):463~466.]
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  • 最后修改日期:2006-01-20
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