• Title/Summary/Keyword: melt textured

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Near Net Shape Processing of RE-Ba-Cu-O Bulk Superconductors

  • Murakami, M.;Fujishiro, M.;Miyazaki, T.;Nariki, S.;Sakai, N.;Hirabayashi, I.
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1319-1320
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    • 2006

  • Several practical applications of melt-textured bulk superconductors require the complex-shaped products such as curved, ring-shaped, and drilled blocks rather than simple shaped pellets. However, melt-textured bulk superconductors are often damaged when they are cut, grinded, or drilled. With the aim of reducing such damages, we have investigated the preparation of the complex-shaped bulk superconductors by previously machining binder-added precursors and pre-sintered precursors. We could produce various complex-shaped bulk superconductors without cracking from these machined precursors

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Magnetic Properties of $Nd_{12}Dy_2Fe_{73.2}Co_{6.6}Ga_{0.6}B_{5.6}$ magnets fabricated by current-applied pressure-assisted method

  • Kim, H. T.;S. H. Cho;Kim, Y. B.;G. A. Kapustin;Kim, H. S.
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.232-233
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    • 2002

  • Nanostructed high energy Nd-Fe-B based bulk magnet can be prepared by hot-working process (hot press and die-upset) from melt-spun amorphous or nanocrystalline powder.[1] Recently, we have investigated a modified method, current-applied pressure-assisted (CAPA) process, to produce nanocrystalline isotropic and anisotropic NdFeB magnets. The process consists of current-applied pressing the melt-spun powders to obtain isotropic precursor subsequent current-applied deforming the precursor to obtain textured magnet.[2-3] (omitted)

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Recent Development of Bulk High-Tc Superconductors

  • Yoo, Sang-Im
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.04a
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    • pp.88-95
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    • 2002

  • Recent development in the field of RE-Ba-Cu-O (REBCO, RE: Y or rare earth elements) bulk high-Tc superconductors (HTS) is reviewed in the present paper. After the fatal weak link problem of sintered REBCO superconductors has been overcome by melt processing, this field has been greatly advanced during last ten years. The critical current density $J_c$ at 77 K has been enhanced by introducing effective flux pinning sites into the $REBa_2Cu_3O_y$ (RE123) superconducting matrix. Large melt-textured REBCO bulk crystals have been fabricated with the TSMG(top-seeded melt growth) technique. Mechanical properties of REBCO bulks have been improved by using the Ag additive or epoxy resin. Real bulk applications such as current lead, fault current limiter, flywheel energy storage system, magnetic field source, magnetic separation system, and etc., surely come true near future.

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