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AssigneeHitachi, Ltd.
InventorsNaofumi Tada, Fumio Iida, Ryukichi Takahashi, Takaaki Suzuki
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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.
A superconductor generated by a diffusion reaction between Nb.sub.2 Al and Nb, said superconductor comprising a Nb.sub.2 Al phase dispersed in a Nb.sub.3 Al phase, said Nb.sub.2 Al phase having an average diameter of utmost 0.1 .mu.m and the interval between each grain of said Nb.sub.2 Al phase being in a range of 0.01-0.1 .mu.m, said superconductor being produced by a method comprising the steps of:
A superconductor wherein magnetic flux pinning centers of Nb.sub.2 Al which have a different phase from a superconducting phase of Nb.sub.3 Al and are effective in a high magnetic field are dispersed in the superconducting phase of Nb.sub.3 Al having effective magnetic flux pinning centers in a low magnetic field, said different phase of Nb.sub.2 Al having an average diameter of utmost 0.1 .mu.m and the interval between each grain of said different phase of Nb.sub.2 Al being in a range of 0.01-0.1 .mu.m;
Dependencies are inferred from the claim text.