| 摘要 |
PURPOSE:To efficiently produce the oxide superconductor having excellent characteristics by extrusion-molding a mixture of the flaky oxide superconductor crystal grains having a specified width-to-thickness ratio and an org. high molecular binder and sintering the molded product. CONSTITUTION:When a Bi-Pb-Sr-Ca-Cu-O-based superconductor, for example, is produced as the oxide superconductor, the powders of Bi2O3, PbO, SrCO3, CaCO3 and CuO as the raw material are mixed in a specified ratio, the mixture is calcined at 700-850 deg.C for about 12hr, the calcined material is crushed, the obtained powder is pelletized, and the pellets are sintered at 830-870 deg.C to obtain the pellets of Bi-Pb-Sr-Ca-Cu-O-based oxide superconductor. The pellets are recrushed to obtain flaky crystal grains having >=10 width-to-thickness ratio, and 50-100 pts.wt. of an org. high molecular binder such as PVA is added to 100 pts.wt. of the grains and mixed. The mixture is extrusion-molded into a rod, and the rod is sintered at 800-900 deg.C to produce the oxide superconductor having a high critical temp. and a high critical current density. |
