2增加到11.5 kA/cm2,增加了64%。由于晶間連接性能和磁通釘扎性能的提高,在較低的降溫速率下,Bi-2223/AgAu帶材在磁場(chǎng)下的臨界電流密度也得到了提高。"/>

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降溫速率對(duì)Bi-2223/AgAu帶材微觀結(jié)構(gòu)和傳輸性能的影響
作者:
作者單位:

1.西北工業(yè)大學(xué);2.西北有色金屬研究院

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國(guó)家磁約束核聚變能發(fā)展計(jì)劃


Effects of cooling rate on the microstructures and transport properties of AgAu sheathed Bi-2223 tapes
Author:
Affiliation:

1.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an;2.Northwest Institute for Nonferrous Metal Research,Xi’an

Fund Project:

National Key Project of Magneto-Constrained Fusion Energy Development Program (2015GB115001)

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    摘要:

    采用PIT工藝制備了單芯Bi-2223/AgAu帶材,系統(tǒng)地研究了第二次熱處理階段(HT2)降溫速率對(duì)帶材相組成、微觀結(jié)構(gòu)和傳輸性能的影響。結(jié)果表明：隨著降溫速率的減小,富鉛相3321不斷增加,CuO顆粒尺寸逐漸增大。當(dāng)冷卻速率從600°C/h減小到1°C/h時(shí),臨界電流密度Jc從7 kA/cm2增加到11.5 kA/cm2,增加了64%。由于晶間連接性能和磁通釘扎性能的提高,在較低的降溫速率下,Bi-2223/AgAu帶材在磁場(chǎng)下的臨界電流密度也得到了提高。

    Abstract:

    Monofilament AgAu sheathed Bi-2223 tapes were fabricated by powder in tube (PIT) process. The influences of cooling rate during the second heat treatment process (HT2) on the phase composition, microstructures and transport properties of Bi-2223/AgAu tapes were systematically investigated. It was noticed that after the HT2 process, the content of Pb-rich Pb3Sr2.5Bi0.5Ca2CuOy (3321) phase increased with the decreasing cooling rate, while the size of CuO phase particles became bigger. With the cooling rate decreasing from 600 °C /h to 1 °C /h, the critical current density, Jc increased from 7 kA/cm2 to the maximum value of 11.5 kA/cm2, which increased for 64%. Meanwhile the current capacities in magnetic field of these Bi-2223/AgAu tapes have also been enhanced with slow cooling process, attributed to the improvements of both the intergrain connectivity and the flux pinning properties.

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馬小波,張勝楠,于澤明,劉國(guó)慶,焦磊,鄭會(huì)玲,李成山,張平祥,李金山.降溫速率對(duì)Bi-2223/AgAu帶材微觀結(jié)構(gòu)和傳輸性能的影響[J].稀有金屬材料與工程,2019,48(6):1814~1818.[Ma Xiaobo, Zhang Shengnan, Yu Zeming, Liu Guoqing, Jiao Lei, Zheng Huiling, Li Chengshan, Zhang Pingxiang, Li Jinshan. Effects of cooling rate on the microstructures and transport properties of AgAu sheathed Bi-2223 tapes[J]. Rare Metal Materials and Engineering,2019,48(6):1814~1818.]
DOI：10.12442/j. issn.1002-185X.20180012

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  • 收稿日期:2018-01-03
  • 最后修改日期:2018-01-16
  • 錄用日期:2018-02-09
  • 在線發(fā)布日期: 2019-07-30
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