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采用包括差示扫描量热分析(DSC)和热重分析(TG)在内的热分析方法,研究了Nb3Sn超导材料扩散热处理过程。以热分析数据为依据,对Nb3Sn低温超导材料样品进行了真空热处理。通过X射线衍射(XRD)和扫描电子显微镜(SEM)分析了Nb3Sn导线组织结构演变。结果表明,通过热分析技术确定了Nb3Sn超导线材的热处理温度范围,Nb3Sn样品在670℃加热得到了组织均匀细小的超导相结构。低温条件下的临界电流测试证明了经过热处理的NbSn导线具备了明显的超导性能。
The thermal analysis of Nb3Sn superconducting materials was investigated by thermal analysis including differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). Based on the thermal analysis data, the Nb3Sn low temperature superconducting material samples were vacuum heat-treated. The structure evolution of Nb3Sn wire was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the heat treatment temperature range of Nb3Sn superconducting wire is determined by thermal analysis technique, and the homogeneous and fine superconducting phase structure of Nb3Sn sample is obtained by heating at 670 ℃. The critical current test at low temperature shows that the heat treated NbSn wire has obvious superconductivity.