Metal treatment – Process of modifying or maintaining internal physical... – Superconductive metal or alloy
Patent
1993-11-23
1997-05-13
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Superconductive metal or alloy
148421, 148670, 420901, 505813, 505523, H01B 1300
Patent
active
056288352
ABSTRACT:
Object of the present invention is to obtain a Nb.sub.3 Al group superconductor having a high critical current density under a whole range of magnetic field from low to high such as 20 T level, manufacturing methods thereof, a Nb.sub.3 Al group superconducting precursory composition, and a magnet for high magnetic field. In a process for manufacturing Nb.sub.3 Al phase by a diffusion reaction of Nb.sub.2 Al phase and Nb phase, a part of the Nb.sub.2 Al phase is remained and dispersed in the Nb.sub.3 Al phase homogeneously as for magnetic flux pinning centers for a high magnetic field. As for a method for dispersing the Nb.sub.2 Al phase homogeneously, a Nb.sub.3 Al group superconducting precursory composition obtained by dispersing Nb particles and Nb.sub.2 Al ultrafine particles by a mechanical alloying method is used, and further, by a conventional method for generating Nb.sub.3 Al phase by a diffusion reaction of Nb and an aluminum alloy, the object of the present invention can be achieved. In accordance with the present invention, a high magnetic field such as 20 T level which has never been achieved with only superconductor at 4.2K can be generated economically with a more compact apparatus than ever, and a coil for generating a high magnetic field can be manufactured with only the Nb.sub.3 Al group superconductor. Therefore, the present invention is significantly effective for a nuclear fusion apparatus of a magnetic confinement type.
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Iida Fumio
Suzuki Takaaki
Tada Naofumi
Takahashi Ryukichi
Hitachi , Ltd.
Phipps Margery S.
Simmons David A.
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