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采用非原位粉末套管法制备MgB2/Fe单芯超导带,并通过X射线衍射拟合分析、差热分析对退火前后的MgB2/Fe带超导芯进行了相成分及不均匀性研究。结果表明:所有的超导芯中均含有一定量的MgO,在高温退火样品中靠近铁套管处MgO含量最多;在MgB2超导芯内部检测到少量的MgB4,这是由MgB2分解所得;在MgB2/Fe之间的界面处存在反应层Fe2B,该相是由Fe23B6分解所得到的。MgB2超导芯与铁套管之间的反应以及超导芯中氧的存在限制了这种非原位法制备的MgB2/Fe带中超导相的含量、纯度和均匀性。
The MgB2 / Fe single-core superconducting tape was prepared by ex-situ powder tube method. The phase composition and inhomogeneity of MgB2 / Fe superconducting core before and after annealing were studied by X-ray diffraction fitting analysis and differential thermal analysis . The results show that all the superconducting cores contain a certain amount of MgO, and the MgO content near the ferrule is the highest in the samples annealed at high temperature. A small amount of MgB4 is detected inside the MgB2 superconducting core, which is caused by the decomposition of MgB2. The reaction layer Fe2B exists at the interface between MgB2 / Fe, which phase is obtained by the decomposition of Fe23B6. The reaction between the MgB2 superconducting core and the ferrule and the presence of oxygen in the superconducting core limit the content, purity and uniformity of the superconducting phase in this non-situ MgB2 / Fe tape.