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CICC导体作为45T混合磁体外超导磁体的重要绕制材料,其所用的超导股线是由牛津公司提供的RRP法制备的高临界电流Nb_3Sn超导线材。由于Nb_3Sn超导相为典型的A15结构,其塑性非常差,所以在实际工程应用当中,往往是采用先绕制线圈,然后对绕制好的线圈进行热处理,进而生成Nb_3Sn超导相。因此,热处理制度的合理制定对于Nb_3Sn超导相的微观组织结构和超导性能具有非常重要的意义。为了验证热处理故障对超导磁体性能的影响,研究制定了三种不同的热处理制度,利用SEM方法对其生成的Nb_3Sn超导相进行微观组织的表征,通过EDS分析Sn元素的扩散;结合Ic值和RRR值的测定结果,对比分析不同热处理制度对Nb_3Sn股线微观组织与性能的影响。
CICC conductor is an important winding material of 45T hybrid magnet outer superconducting magnet. The superconducting cords used are high critical current Nb_3Sn superconducting wires prepared by RRP of Oxford. Because Nb3Sn superconducting phase is a typical A15 structure, its plasticity is very poor. Therefore, in actual engineering applications, it is often used to coil first, and then heat the wound coil to form Nb3Sn superconducting phase. Therefore, the reasonable formulation of heat treatment system is very important for the microstructure and superconductivity of Nb3Sn superconducting phase. In order to verify the effect of heat treatment on the performance of superconducting magnet, three different heat treatment systems were developed and studied. The microstructure of Nb3Sn superconducting phase was characterized by SEM. The diffusion of Sn was analyzed by EDS. And RRR value of the results of the comparative analysis of different heat treatment system Nb_3Sn strand microstructure and properties.