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Influence of Nb Diffusion Layer on Superconductivity of MgB2/Nb/Cu Wires
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Influence of Nb Diffusion Layer on Superconductivity of MgB2/Nb/Cu Wires
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Nature Science Foundation of China (50877067); National Basic Research Program of China (2011CB605904)

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    摘要:

    采用原位法粉末裝管工藝（in-situ PIT），以Nb/Cu復(fù)合管作為包套材料制備了MgB2超導(dǎo)線材并且在氬氣保護(hù)氣氛中，不同溫度條件下保溫2 h進(jìn)行成相熱處理。分別采用電阻-溫度測(cè)試、磁矩轉(zhuǎn)變測(cè)試、臨界傳輸電流測(cè)試以及Nb-MgB2界面磁光研究等分析手段進(jìn)行研究。結(jié)果表明：當(dāng)熱處理溫度高于750 ℃時(shí)，在MgB2超導(dǎo)芯絲和Nb阻隔層之間形成一個(gè)擴(kuò)散層，該擴(kuò)散層的存在阻礙了電流的傳輸，從而導(dǎo)致在磁測(cè)法測(cè)試中可以檢測(cè)到超導(dǎo)相存在，而在傳輸法測(cè)試中無(wú)法看到超導(dǎo)傳輸現(xiàn)象。說(shuō)明采用Nb作為MgB2超導(dǎo)線帶材的擴(kuò)散阻隔層時(shí)其熱處理溫度不能高于750 ℃

    Abstract:

    The MgB2 wires were prepared by in-situ Powder-in-Tube (PIT) method with Nb/Cu compounds tube as the sheath and then were heat treated at various temperatures for 2 h in flowing argon. The resistivity (R-T), magnetic moment (M-T), transport critical current (Ic-B) and magneto optical (MO) properties of MgB2 wires were analyzed. The results show that there is a diffusion layer between MgB2 superconducting core and Nb barrier layer when the heat-treatment temperature is higher than 750 °C, and this diffusion layer obstructs the current transfer into MgB2 superconductor core from the Cu sheath. This indicates that the best heat-treatment temperature for the MgB2 wires with Nb as the barrier layer should be lower than 750 °C

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王慶陽(yáng),張平祥,閆 果,A. Sulpice,熊曉梅,楊 芳,劉國(guó)慶,焦高峰,李成山. Influence of Nb Diffusion Layer on Superconductivity of MgB2/Nb/Cu Wires[J].稀有金屬材料與工程,2013,42(5):881~884.[Wang Qingyang, Zhang Pingxiang, Yan Guo, A. Sulpice, Xiong Xiaomei, Yang Fang, Liu Guoqing, Jiao Gaofeng, Li Chengshan. Influence of Nb Diffusion Layer on Superconductivity of MgB2/Nb/Cu Wires[J]. Rare Metal Materials and Engineering,2013,42(5):881~884.]
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  • 收稿日期:2012-04-27
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