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通過Nb，Ti擴(kuò)散反應(yīng)制備不同成分的超導(dǎo)體
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TG146

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國(guó)家“863”計(jì)劃資助項(xiàng)目(2002AA306231)


NbTi Superconductors with Variable Compositions Produced by Diffusion Reaction of Niobium and Titanium Sheets
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    摘要:

    利用Nb片和Ti片交替組配加工,經(jīng)擴(kuò)散反應(yīng)制備了Ti含量在42.56%-56.62%之間的3種不同成分的NbTi超導(dǎo)線。運(yùn)用掃描電鏡(SEM)觀察了Nb/Ti界面的擴(kuò)散形態(tài)及微結(jié)構(gòu),并對(duì)熱處理工藝和不同Ti含量對(duì)臨界電流密度(Jc)的影響進(jìn)行了討論。結(jié)果表明:隨著Ti含量增加,可提高超導(dǎo)線在低場(chǎng)(<5T)時(shí)的臨界電流密度Jc。該工藝制備的NbTi超導(dǎo)線材的Jc可達(dá)到2800A/mm2(5T,4.2K)和4200A/mm2(3T,4.2K)。隨著Ti含量的增加,試樣的Jc在低場(chǎng)時(shí)很高,而在高場(chǎng)時(shí)的性能偏低,且下降迅速,而Ti含量低的試樣的Jc衰減相對(duì)緩慢些。對(duì)Ti含量較高的合金,在一定溫度下,選用較短的熱處理時(shí)間,可獲得高的Jc,對(duì)Ti含最較低的合金,則要求較長(zhǎng)熱處理時(shí)間。

    Abstract:

    Three different compositions of NbTi wires have been fabricated by using alternately pure Nb and Ti sheets with Ti contents from 42.5% to 56.6% by adjusting the relative thickness of the Nb and Ti sheets in the monofilaments. Two kinds of heating treatments were discussed and the Nb/Ti interface microstructure and diffusion morphology of cross-section have been investigated by scanning electron microscopy (SEM). The results show that the Jc values are 2 800 A/mm2 at 5 T/4.2K and 4 200 A/mm2 at 3 T/4.2 K. With the increase of Ti content, Jc is higher at low magnetic fields (<5 T), but lower and decreasing rapidly at high magnetic fields. Jc decreases slight slowly for the lower Ti samples. At a given temperature, higher Jc can be gotten by using shorter time of heat treatment for the higher Ti samples, and by using longer time for the lower Ti samples.

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謝寶海,吳曉祖,陳自力,劉向宏,付寶全,楊曉東,周廉.通過Nb，Ti擴(kuò)散反應(yīng)制備不同成分的超導(dǎo)體[J].稀有金屬材料與工程,2005,34(6):876~880.[Xie Baohai, Wu Xiaozu, Chen Zili, Liu Xianghong, Fu Baoquan, Yang Xiaodong, Zhou Lian. NbTi Superconductors with Variable Compositions Produced by Diffusion Reaction of Niobium and Titanium Sheets[J]. Rare Metal Materials and Engineering,2005,34(6):876~880.]
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  • 最后修改日期:2003-11-24
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