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采用原位粉末套管法(in-situ PIT)制备了不同包套材料的MgB2线材,前驱粉末按照Mg:B=1.1:2的比例将Mg粉和B粉混合均匀,分别装人低碳钢、316L不锈钢以及Monel管中,均拉拔至直径1mm,然后800℃保温10min.对烧结后的线材进行微观形貌、相成分以及超导电性的分析检测.结果表明,MgB_2/Monel线材内部粉体中生成MgNi_2相,使其临界电流密度减弱;MgB_2/SS线材由于MgB_2粒径较大,使其高场下的J_c值较差;MgB_2/Fe线材的超导电性最好,在10K,0T时J_c高达5.3×10~5 A/cm~2.
MgB2 wires with different cladding materials were prepared by in-situ PIT. The precursor powders were mixed uniformly with Mg powder and B powder according to the ratio of Mg: B = 1.1: 2, , 316L stainless steel and Monel tube were drawn to a diameter of 1mm, and then incubated at 800 ℃ for 10min.The microstructure, phase composition and superconductivity of the sintered wire were analyzed and tested.The results showed that the inner powder of MgB_2 / Monel wire The critical current density of MgB_2 / SS wire is lower due to the larger particle size of MgB_2, which makes the J_c value of the MgB_2 / SS wire worse. The superconductivity of MgB_2 / Fe wire is the best at 10K, 0T When J_c up to 5.3 × 10 ~ 5 A / cm ~ 2.