論文

2003年9月

Mechanical and superconducting properties of PIT-processed MgB2 wire after heat treatment

SUPERCONDUCTOR SCIENCE & TECHNOLOGY
  • K Yamamoto
  • ,
  • K Osamura
  • ,
  • S Balamurugan
  • ,
  • T Nakamura
  • ,
  • T Hoshino
  • ,
  • Muta, I

16
9
開始ページ
1052
終了ページ
1058
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/0953-2048/16/9/315
出版者・発行元
IOP PUBLISHING LTD

The mechanical and superconducting properties of MgB2 wires heat treated at various conditions have been investigated. Superconducting MgB2 wires, fabricated by the powder-in-tube (PIT) method, show a transition temperature T-c at 32.4 K for the as-rolled wire as shown by dc-resistivity measurement. It is found that the T-c is improved (37.3-38.4 K) by subsequent Ar annealing treatment under various sintering temperatures and times. Remarkably, the annealed samples show significant improvement in the overall quality of the samples. On annealing at 1323 K for 0.6 ks, we obtained the best quality sample with a J(c) of 470 A mm(-2) at 2.0 T. In order to find out the irreversible field (B-irr), the technique of the Kramer plot was applied. The B-irr obtained was 7.6 and 9.6 T, for the as-rolled as well as the annealed samples at 1073 K for 3.6 ks, respectively. The mechanical properties were measured under tensile load. The yield stress was 450 MPa for the as-rolled sample and decreased by annealing at 1323 K for 0.6 ks to 110 MPa. After the wires were heat treated at temperatures between 1073 and 1323 K and tensile-stressed up to their yield stress at room temperature. The critical current measurements were carried on such samples at 4.2 K under applied magnetic fields of 2 and 5 T. The stress level for the 95% tolerance of critical current was determined to 97 MPa.


リンク情報
DOI
https://doi.org/10.1088/0953-2048/16/9/315
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000185770200016&DestApp=WOS_CPL
ID情報
  • DOI : 10.1088/0953-2048/16/9/315
  • ISSN : 0953-2048
  • Web of Science ID : WOS:000185770200016

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