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无定形C掺杂对MgB_2微结构和超导电性的影响
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作者 孙昱艳 张平祥 +1 位作者 白质明 陈思华 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第8期1153-1156,共4页
采用原位法粉末装管工艺制备了MgB2-xCx/Nb/Cu单芯线材.通过X射线衍射(XRD)、扫描电镜(EMS)和物性测试仪(PPMS)等手段研究了无定形C掺杂对线材微观结构及超导电性的影响.结果显示,随着C掺杂量的增加,进入MgB2晶格的C含量增加,MgB2层间... 采用原位法粉末装管工艺制备了MgB2-xCx/Nb/Cu单芯线材.通过X射线衍射(XRD)、扫描电镜(EMS)和物性测试仪(PPMS)等手段研究了无定形C掺杂对线材微观结构及超导电性的影响.结果显示,随着C掺杂量的增加,进入MgB2晶格的C含量增加,MgB2层间结构不变.样品性能达到实用化超导磁体要求,在温度30 K外场0.2 T条件下,C掺杂量x=0,0.05,0.10,0.15的样品临界电流密度分别达8.1×104,1.7×105,1.6×105和1.0×105A/cm2.实验表明最佳C掺杂量x在0.05与0.10之间. 展开更多
关键词 MgB2-xCx/Nb/Cu单芯线材 化学掺杂 微观结构 超导电性 原位法粉末装管工艺
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转变法制备粉末套管Nb_3Al超导线材及其性能研究
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作者 陈传 白质明 张平祥 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2016年第2期300-304,共5页
使用自主研发的快热快冷处理设备,对粉末装管Nb/Al前驱线进行快热快冷处理,然后再经过800℃10 h转变退火处理,得到具有Nb3Al超导相的超导短样.通过扫描电镜观察分析超导样品微观结构,发现所有样品均有Nb3Al相存在,但在靠近Ta管内层有少... 使用自主研发的快热快冷处理设备,对粉末装管Nb/Al前驱线进行快热快冷处理,然后再经过800℃10 h转变退火处理,得到具有Nb3Al超导相的超导短样.通过扫描电镜观察分析超导样品微观结构,发现所有样品均有Nb3Al相存在,但在靠近Ta管内层有少量的Nb2Al相,超导芯内有少量的Nb剩余.在制冷机冷却的环境下使用四引线法测试了样品的超导性能.结果表明,自场下在10.9 K温度时,没有铜稳定体的Nb3Al超导线最高临界电流密度是66.5 A/mm2,超导起始转变温度是15~18 K. 展开更多
关键词 快热快冷转变法(RHQT) 超导线 Nb3Al 粉末装管 临界电流 临界温度
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Experiment and Simulation for Rolling of Diamond–Cu Composites 被引量:1
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作者 Yun-Long Wang Kai-Kun Wang +1 位作者 Yu-Wei Wang Guang-Chen Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第8期791-800,共10页
We demonstrate an innovative preparation approach of diamond/Cu composites by powder-in-tube technique and rolling. A small copper tube was loaded with Ti- and Cu-coated diamond particles, mad then the diamond particl... We demonstrate an innovative preparation approach of diamond/Cu composites by powder-in-tube technique and rolling. A small copper tube was loaded with Ti- and Cu-coated diamond particles, mad then the diamond particles were combined with Cu matrix by composite rolling. The morphology and element distribution of the interface between diamond and Cu were determined by scanning electron microscopy and energy-dispersive spectrometer. Finite element method (FEM) simulation was used to analyze the rolling process associated with experiment by DEFORM-3D. The final experimental results showed that homogeneous distribution of diamond particles could be observed in the center layer of the composites. According to the contrast experiments, the sample, whose diamond particle size is 0.12-0.15 mm and thickness of pre-rolling is 1.2 mm, showed relatively complete morphologies and homogeneous distribution. Experimental results indicated a poor efficacy of excessive rolling reduction. The thermal conductivity of the composites is about 453 W (m K)-1 by theoretical calculation. For FEM simulation, roiling strain and temperature field of the composites were simulated by DEFORM-3D. Simulation results were interpreted, and numerical results verified the reliability of the model. The simulation predicted that the local area of large strain, indicative of the strain along the thickness direction, could be intensified by adding diamond particles. 展开更多
关键词 Diamond/Cu composites powder-in-tube technique pit ROLLING Finite element method(FEM) simulation
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