Improvement of thermal stability with alloy impregnation in Gd-Ba-Cu-O superconductors for pulsed field magnetization

Y. Kimura, H. Matsumoto, H. Fukai, Naomichi Sakai, I. Hirabayashi, M. Izumi, Masato Murakami

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We present a post-fabrication treatment that improves thermal conductivity of bulk Gd-Ba-Cu-O magnets. A small hole about 1 mm in diameter was artificially drilled into the centre of bulk Gd-Ba-Cu-O 25 mm in diameter and 18 mm in thickness. An aluminium wire was inserted into the hole, and then the sample was subjected to the impregnation by using Bi- Su-Cd alloy. A pulsed-field magnetization was performed for Gd-Ba-Cu-O bulk with and without the alloy impregnation treatment. The temperature of samples was monitored with thermocouples and local magnetic field density was measured with a Hall sensor at several positions. The maximum temperature rise was depressed by 4 K and the trapped field was increased by 25 % at 44 K. The result shows that the alloy impregnation is very effective in enhancing the thermal conductivity and thereby improving the field trapping ability.

Original languageEnglish
Article number097
Pages (from-to)389-392
Number of pages4
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2006 Jun 1


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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