+高级检索
新型时效热处理工艺对多芯NbTi超导线材微观组织和临界电流密度的影响
作者:
作者单位:

西部超导材料科技股份有限公司

作者简介:

通讯作者:

中图分类号:

基金项目:

陕西省国际科技合作计划项目(编号:2017KW-022)资助课题


The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire
Author:
Affiliation:

Western Superconducting Technologies Co,LTD,Xi’an National Engineering Laboratory for Superconducting Materials,Xi’an

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    本文以高均匀性Nb47Ti合金棒和高纯无氧铜为原材料,制备了铜比1.3,630芯的NbTi/Cu超导线。提出了一种新型时效热处理工艺“短时预时效热处理+高温长时间时效热处理”,即“405℃/3h + 405℃/3h + 420℃/20h + 420℃/40h + 420℃/80h”工艺,该工艺可显著提高NbTi超导线材的临界电流密度,较普通热处理艺线材提高近17.5%,最高可以达到3208A/mm2。足够的预时效次数(2次)才能使基体中析出足够多的α形核数量,进而才能在较大的最终应变下显著提高临界电流密度。此外,在4.64,5.35,6.25三种预应变条件之下,临界电流密度达到峰值的最终应变都集中在5.0~5.2之间,即,必须将最终应变控制在5.0~5.2。该新型工艺已经应用于大批量生产中,线材各种性能稳定,得到客户的一致认可。

    Abstract:

    In present paper, NbTi/Cu wire the low copper-to-superconductor ratio of 1.3 and filament number of 630 was prepared using high homogenous Nb47Ti alloy bar and oxygen-free copper firstly. New type of aging heat treatment (“405℃/3h + 405℃/3h + 420℃/20h + 420℃/40h + 420℃/80h”) was proposed. Comparing with the traditional heat treatment, this new type heat treatment can largely improve the critical current density of NbTi superconducting wire to 3208A/mm2, with an increment of 17.5%. Only when the pre-heat treatment times is equal to or more than 2 times, huge of nucleation can be formed and critical current density can be improved obviously. In addition, Critical current densities of wire under three pre-strain conditions (4.64, 5.35 and 6.25) all get the peak value when final strain is between 5.0~5.2.

    参考文献
    相似文献
    引证文献
引用本文

郭强,张平祥,冯勇,刘向宏,李建峰,闫凯鹃.新型时效热处理工艺对多芯NbTi超导线材微观组织和临界电流密度的影响[J].稀有金属材料与工程,2019,48(12):4113~4118.[GUO Qiang, ZHANG Ping-Xiang, FENG Yong, LIU Xiang-Hong, LI Jian-Feng, Yanm Kai-Juan. The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire[J]. Rare Metal Materials and Engineering,2019,48(12):4113~4118.]
DOI:10.12442/j. issn.1002-185X.20190255

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-03-27
  • 最后修改日期:2019-04-23
  • 录用日期:2019-05-15
  • 在线发布日期: 2020-01-07
  • 出版日期: