| 摘要 |
PURPOSE:To prevent the deformation and damage of an extrusion-molded product and the falling off of ground product during the time from its extrusion molding to sintering, by extrusion-molding the ground product of calcinated body while forming a resin liquid coating layer on the surface of the extrusion- molded product. CONSTITUTION:According to a desired superconducting material, as material are used, for example in the case of Y-Ba-Cu-O system, yttrium oxide, barium carbonate and copper oxide, and in the case of La-Sr-Cu-O system, lanthanum oxide, strontium carbonate and copper oxide. The mixture of material powder is performed normally in warming type for example by adding alcohol, and after dried the molded body is calcinated. Alcohol is used also when the calcinated body is ground and the ground product obtained after dried is extrusion-molded. In this extrusion-molding, a resin liquid coating layer is allowed to form on the surface of the extrusion-molding of said ground product. As this resin is used polyolefin, vinyl polymer or polyamide. Further, in extrusion-molding binder, plasticizer and solvent are preferably blended, wherein cellulose acetate butylate, nitrocellulose or others is used as said binder. |
