ITER用内锡法Nb_3Sn超导线材的不可逆温度研究(英文)  

IRREVERSIBILITY TEMPERATURE INVESTIGATION OF ITER Nb_3 Sn WIRE BY INTERNAL-Sn PROCESS

作　　者：张超武[1,2] Andre Sulpice 周廉[1,2] 唐先德[4] Jean-Louis oubeyroux 张平祥[4] 卢亚峰[4] 

机构地区：[1]陕西科技大学 [2]西北有色金属研究院,陕西西安710016 [3]法国国家科研中心(CNRS) [4]西北有色金属研究院

出　　处：《低温物理学报》2006年第4期311-315,共5页Low Temperature Physical Letters

基　　金：中法科技合作项目资助,合同号:CNRSNO722441.~~

摘　　要：本文采用超导量子干涉仪(SQUID)测定了一种国际热核聚变实验堆(ITER)项目用内锡法Nb3Sn超导线材的不可逆温度,测量方法是在恒定磁场下循环温度,即将温度以一定间隔从10K上升到20K,然后再返回到10K,测定磁矩的偏离温度.所得结果可用于从生成最佳Nb-Sn相组成方面来优化A15相成相热处理制度.本研究得出的结论是,对于像ITER使用的高场磁体超导线来说,鉴于其需要在较高磁场下有高的临界电流密度,就需要将超导线的热处理温度适当提高一些.本实验所用Nb3Sn超导线材的最适宜热处理制度为675°C/128小时,这样可以得到最佳不可逆温度特性,即最佳的A15相组成.The irreversibility temperature of ITER Nb3Sn superconducting wire which is made by internal-Sn process was measured with a SQUID magnetometer by cycling the temperature from 10K to 20K and then down back to 10K at a constant magnetic field. The obtained results could be used to optimize the A15 phase formation heat treatment process and to determine the superior Nb-Sn phase composition of the reacted wire. Our study demonstrates the conclusion that with the requirement of high Jc at higher field for the wire of ITER＇ s high-field magnets, it is necessary to heat-treat the wire at a relatively higher temperature for a suitable time. For ITER＇ s wire, a little higher enduring temperature of 675℃ for around 128hrs dwelling time should be the suitable selection owing to the best irreversibility property and thus the super A15 phase composition.

关 键 词：Nb3Sn超导线材 不可逆温度 ITER工程 内锡法 

分 类 号：O511.4[理学—低温物理]