2超導(dǎo)線材時(shí),易于出現(xiàn)斷芯、斷線現(xiàn)象。針對(duì)一問(wèn)題,本實(shí)驗(yàn)中以強(qiáng)度較高的夢(mèng)乃爾合金(Monel 400)作為包套材料,以旋鍛、拉拔、軋制及中間熱處理相結(jié)合的加工手段成功的制備出直徑Φ1.0 mm、37芯結(jié)構(gòu)的多芯MgB2超導(dǎo)長(zhǎng)線材。微觀結(jié)構(gòu)分析表明多芯線材中MgB2芯絲及替換芯絲等亞組元的分布較為規(guī)整,阻隔層未出現(xiàn)明顯破損現(xiàn)象,最終線材中MgB2超導(dǎo)芯絲的平均直徑約80 μm。室溫拉伸性能顯示熱處理前MgB2線材的屈服強(qiáng)度為759 MPa,熱處理后的線材為248 MPa。4.2 K、4 T下,線材的臨界電流密度Jc達(dá)到2.31×105 A.cm-2,工程臨界電流密度達(dá)到3.16×104 A.cm-2。"/>

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原位粉末裝管法37芯MgB2線材的制備及性能研究
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1.西北有色金屬研究院;2.西藏民族大學(xué)信息工程學(xué)院;3.西部超導(dǎo)材料科技股份有限公司

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國(guó)家自然科學(xué)基金(51772250),陜西省自然科學(xué)基金(2017ZDJC-19)和西安市未央?yún)^(qū)科技計(jì)劃項(xiàng)目(201818)


Fabrication and properties of 37-filaments MgB2 superconducting wires by in-situ powder-in-tube method
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    摘要:

    傳統(tǒng)的Cu包套原位粉末裝管法(in situ PIT)制備多芯MgB2超導(dǎo)線材時(shí),易于出現(xiàn)斷芯、斷線現(xiàn)象。針對(duì)一問(wèn)題,本實(shí)驗(yàn)中以強(qiáng)度較高的夢(mèng)乃爾合金(Monel 400)作為包套材料,以旋鍛、拉拔、軋制及中間熱處理相結(jié)合的加工手段成功的制備出直徑Φ1.0 mm、37芯結(jié)構(gòu)的多芯MgB2超導(dǎo)長(zhǎng)線材。微觀結(jié)構(gòu)分析表明多芯線材中MgB2芯絲及替換芯絲等亞組元的分布較為規(guī)整,阻隔層未出現(xiàn)明顯破損現(xiàn)象,最終線材中MgB2超導(dǎo)芯絲的平均直徑約80 μm。室溫拉伸性能顯示熱處理前MgB2線材的屈服強(qiáng)度為759 MPa,熱處理后的線材為248 MPa。4.2 K、4 T下,線材的臨界電流密度Jc達(dá)到2.31×105 A.cm-2,工程臨界電流密度達(dá)到3.16×104 A.cm-2。

    Abstract:

    The filament fractures or wire breaks in multi core MgB2 wire was appeared frequent while using the traditional in-situ powder in tube (PIT) method with Cu as the sheath material. For this problem, the 37 filament MgB2 long wires with the diameter of 1 mm, sheathed with higher strength Monel alloys (Monel 400) is fabricated with compound fabrication process including rotary swage, drawing, rolling and middle annealing heat treatment。Microstracture showed that the sub component including MgB2 filament and NbCu replacement is uniformly distributed and the Nb diffusion barrier is no breaking points. The mean diameter in MgB2 filament is only 80 μm in final wires. The yield strength is around 759 MPa. for the as-drawn wire and 248 MPa for the sintered wire. The critical current density (Jc) and engineering current density (Je) are arrived 2.31×105 A.cm-2 and 3.16×104A.cm-2 at 4.2 K、4 T respectively.

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王慶陽(yáng),張可榮,熊曉梅,楊芳,郗丹,王大友,李成山,閆果,馮勇,張平祥.原位粉末裝管法37芯MgB2線材的制備及性能研究[J].稀有金屬材料與工程,2020,49(8):2825~2829.[WANG Qingyang, ZHANG Kerong, XIONG Xiaomei, YANG Fang, XI Dan, WANG Dayou, LI Chengshan, YAN Guo, FENG Yong, ZHANG Pingxiang. Fabrication and properties of 37-filaments MgB2 superconducting wires by in-situ powder-in-tube method[J]. Rare Metal Materials and Engineering,2020,49(8):2825~2829.]
DOI：10.12442/j. issn.1002-185X.20190619

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  • 收稿日期:2019-07-27
  • 最后修改日期:2019-10-17
  • 錄用日期:2019-10-18
  • 在線發(fā)布日期: 2020-09-27
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