熊晓梅,杨芳,王庆阳,闫果,冯建情,金利华,刘浩然,潘熙锋,郗丹,张平祥.不同包套石墨烯掺杂MgB2线材的超导性能研究[J].稀有金属材料与工程,2019,48(4):1330~1335.[Xiong Xiaomei,Yang Fang,Wang Qingyang,Yan Guo,Feng Janqing,Jin linhua,Liu Haoran,Pan Xifeng,Xi Dan,Zhang Pingxiang.The superconducting properties research for different sheath MgB2 wiresdoped with graphene[J].Rare Metal Materials and Engineering,2019,48(4):1330~1335.]
不同包套石墨烯掺杂MgB2线材的超导性能研究
投稿时间:2017-10-11  修订日期:2017-11-02
中文关键词:  MgB2线材  阻隔层  石墨烯掺杂  临界电流密度
基金项目:国家自然科学基金(51772250和51372207);国家重点研发计划(2017YFB0902303)
中文摘要:
      分别采用Fe和Nb作为阻隔层包套材料,通过原位粉末装管法工艺(in-situ PIT)制备出石墨烯掺杂的MgB2/Fe(Nb)/Cu线材和Nb包套未掺杂的MgB2单芯线材。在高纯氩气保护下、670~800 ℃保温2 h热处理线材。X-ray衍射显示,670 ℃热处理的线材主相均为MgB2超导相,其中Fe包套线材的MgB2相中含有Fe2B杂相。三种线材的微观结构显示,未掺杂线材基体中的孔洞相对较大,而石墨烯掺杂的Fe、Nb包套线材晶粒之间的孔洞相对较小。线材样品的拉伸性能结果显示,热处理前由于加工硬化,三种线材的拉伸应变值远远低于热处理后的拉伸应变值,其中铁包套线材的硬化最为严重,但无论是否热处理,Fe包套样品的强度都是最大的。四引线法传输性能测试显示,670 ℃热处理Nb包套掺杂线材的临界电流密度(Jc)在4.2 k,2 T、4 T、6 T范围内均高于Fe包套掺杂线材的Jc,石墨烯掺杂线材(Nb、Fe包套)在2 T具有更好的传输性能,Nb包套掺杂线材的Jc最高可达到4.5×105A/cm2。大于4 T后,两种包套的掺杂线材的Jc均低于未掺杂的线材,Fe包套样品的超导性能降低更大,显示其掺杂未全部进入晶格,导致在高场失去了磁通钉扎作用。
The superconducting properties research for different sheath MgB2 wiresdoped with graphene
英文关键词:MgB2 wire  barrier  graphene doping  critical current density
英文摘要:
      Single filament MgB2/Fe(Nb)/Cu wires with or without graphene doping, using Fe and Nb as the diffusion layer, were fabricated by the in-situ PIT method. The heat treatment of sample is at 670~800 ℃ for 2 hours under high purity Ar atmosphere. X-ray diffraction pattern shows the main phase for the wires with heat treatment at 670℃ was whole MgB2 phase, except partial Fe2B impurity phase in Fe sheathed MgB2 wires. Microstructure analysis shows the hole between crystal grains in the wire without doping was bigger than that of Fe or Nb sheathed MgB2wire doped with graphene. Stress-strain test result shows the tensile strain value for the wire before heat treatment was lower than that of wires after heat treatment obviously. Hardenability of Fe sheathed wires was more sharpness. The strength was the maximum for Fe sheathed wires with or without heat treatment. Four probe transfer measurement properties show that the critical current density Jc of Nb sheated wire heat trwatment at 670 ℃ was higher than that of Fe sheated wire at 4.2 k with the field of 2 T,4 T and 6 T. Nb and Fe sheated MgB2 wires doped with graphene possess better transfer porformence at 2 T. The Jc value at 2 T was arrived at 4.5×105A/cm2 for Nb sheated wires. When the field is higher than 4 T, the Jc value of Nb and Fe sheated MgB2 wire doped with graphene was lower than that of undoped wire. The transfer property of Fe sheated wires reduce faster than that of other samples. This indicates that the dopants incompletly enter the crystal structure and led to the reduced flux pinning function at high field.
作者单位E-mail
熊晓梅 西北有色金属研究院 bhzhang@c-nin.com 
杨芳 西北有色金属研究院  
王庆阳 西北有色金属研究院  
闫果 西部超导材料科技股份有限公司  
冯建情 西北有色金属研究院  
金利华 西北有色金属研究院  
刘浩然 西北工业大学  
潘熙锋 西部超导材料科技股份有限公司  
郗丹 西部超导材料科技股份有限公司  
张平祥 西北有色金属研究院  
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