压痕对低温和高温超导股线临界性能影响研究

Indentation effect on the critical current of low temperature and high temperature strands

低温超导股线Nb Ti和Nb3Sn用于核聚变装置用的CICC导体结构,由于绞缆的作用及导体生产过程中的挤压作用,将会导致Nb Ti和Nb3Sn超导股线的表面产生不同形式的压痕,过大的压痕将会影响股线的临界性能;高温超导股线Bi-2212和Mg B2是未来可用于核聚变装置中制成CICC导体潜在的高温超导材料,由于高温超导材料的脆性,在电缆制备及导体制造过程中也会导致股线的表面产生压痕影响股线的性能。文中主要开展对于低温超导股线Nb Ti,Nb3Sn及高温超导股线Bi-2212和Mg B2的临界性能随压痕深度的变化规律,从而为导体制造的改进及未来高温超导导体的制造提供理论依据。

The low temperature superconducting strands of NbTi and Nb3Sn is used in the CICC conductor in nuclear fusion device. The low temperature strand could be caused indentation by cabling and conductor manufacture, if the indentation is deeper that will influence the critical current performance. The high temperature strands of Bi -2212 and MgB2 are the potential material for the future CICC conductor in next generation nuclear fusion device. Because the high temperature superconductor is brittleness material, it also could be generated the indentation when used to be cabling. This paper mainly carried on the research on indentation effect on the critical current of NbTi, Nb3 Sn, Bi -2212 and MgB2 strand, it will provide theoretical basis for modified conductor manufacture and future high temperature conductor manufacture.