| 摘要 |
PROBLEM TO BE SOLVED: To lessen defects in superconductor powder and the internal stress of the powder, to inhibit the reduction in the critical temperature of the powder and at the same time, to enhance the stability of the powder by a method wherein the superconductor powder is manufactured by a melt spray method and this superconductor powder is subjected to heat treatment. SOLUTION: Gd2 O3 fine powder, BaLO3 X fine powder and CuO fine powder are mixed with each other and are dispersed and thereafter, the fine powder is melted in a platinum crucible. Then, a centrifugal spray device is rotated to make a molten material fall on a disc, the molten material is formed into spray and fine powder is obtained. A rationalization of the gain size and gain size distribution of the obtainable powder is easily contrived by adjusting the number of revolutions of the disc. The shape of the powder obtained at this time is formed into roughly a globular shape. Then, in a powdering, which is conducted by a centrifugal spray method, oxygen in the powder is not proper and moreover, as the structure of the powder is not stable, this powder is subjected to annealing treatment in an oxygen atmosphere and superconductor powder is obtained. |
