Melt processing of bulk high Tc superconductors and their application

Masato Murakami, T. Oyama, H. Fujimoto, S. Gotoh, K. Yamaguchi, Y. Shiohara, N. Koshizuaka, S. Tanaka

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

The authors report a melt-powder-melt-growth (MPMG) process which results in high Jc for bulk Y-Ba-Cu-O superconductors. The Y-Ba-Cu-O pellets or powders are melt quenched. The quenched plates are crushed into powder and mixed well. The powder is then compacted into desired shapes, remelted, and slowly cooled in a thermal gradient. When the starting composition is changed from the 1:2:3 stoichiometry toward the Y2BaCuO5(211) rich region, the 211 inclusions can be dispersed in the YBa2Cu3Ox matrix, which contributes to increases in both flux pinning force and fracture toughness. A Jc value exceeding 3 × 108 A/m2 has been achieved at 77 K and 1 T. Another attractive feature of the MPMG process is that other components such as fine Ag powders can be added during solid-state mixing. Fine dispersion of Ag particles can effectively reduce the amount of cracking. MPMG-processed Y-Ba-Cu-O with Ag doping can levitate a mass of 3-kg at 1-mm height using a repulsive force against a 0.4-T magnet. A noncontacting rotation device such as a magnetic bearing can be made utilizing bulk high-Jc materials. A superconducting permanent magnet is also a promising candidate for future application. MPMG-processed Y-Ba-Cu-O can generate 0.25 T at 77 K.

Original languageEnglish
Pages (from-to)1479-1486
Number of pages8
JournalIEEE Transactions on Magnetics
Volume27
Issue number2 pt II
DOIs
Publication statusPublished - 1991 Mar
Externally publishedYes

Fingerprint

Powders
Superconducting materials
Processing
Flux pinning
YBCO superconductors
magnetic bearings
Magnetic bearings
Superconducting magnets
flux pinning
superconducting magnets
toughness
fracture strength
permanent magnets
pellets
Stoichiometry
Thermal gradients
Permanent magnets
Magnets
Fracture toughness
stoichiometry

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Murakami, M., Oyama, T., Fujimoto, H., Gotoh, S., Yamaguchi, K., Shiohara, Y., ... Tanaka, S. (1991). Melt processing of bulk high Tc superconductors and their application. IEEE Transactions on Magnetics, 27(2 pt II), 1479-1486. https://doi.org/10.1109/20.133464

Melt processing of bulk high Tc superconductors and their application. / Murakami, Masato; Oyama, T.; Fujimoto, H.; Gotoh, S.; Yamaguchi, K.; Shiohara, Y.; Koshizuaka, N.; Tanaka, S.

In: IEEE Transactions on Magnetics, Vol. 27, No. 2 pt II, 03.1991, p. 1479-1486.

Research output: Contribution to journalArticle

Murakami, M, Oyama, T, Fujimoto, H, Gotoh, S, Yamaguchi, K, Shiohara, Y, Koshizuaka, N & Tanaka, S 1991, 'Melt processing of bulk high Tc superconductors and their application', IEEE Transactions on Magnetics, vol. 27, no. 2 pt II, pp. 1479-1486. https://doi.org/10.1109/20.133464
Murakami M, Oyama T, Fujimoto H, Gotoh S, Yamaguchi K, Shiohara Y et al. Melt processing of bulk high Tc superconductors and their application. IEEE Transactions on Magnetics. 1991 Mar;27(2 pt II):1479-1486. https://doi.org/10.1109/20.133464
Murakami, Masato ; Oyama, T. ; Fujimoto, H. ; Gotoh, S. ; Yamaguchi, K. ; Shiohara, Y. ; Koshizuaka, N. ; Tanaka, S. / Melt processing of bulk high Tc superconductors and their application. In: IEEE Transactions on Magnetics. 1991 ; Vol. 27, No. 2 pt II. pp. 1479-1486.
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