Method for producing a wire- or band-shaped ceramic superconductor
AssigneeAsea Brown Boveri AG
InventorFranz Kloucek
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Abstract
Production of a wire-shaped ceramic high-temperature superconductor based on (Y,SE)Ba.sub.2 Cu.sub.3 O.sub.6.5+y with SE=rare earth metal and 0<y<1, in which 80 to 95% by weight of an ultra-fine grained powder (1) of globulitic particles having a maximum diameter of 1 .mu.m are processed with 0.5 to 3% by weight of a powder (3) of needle- and plate-shaped particles having a length of 10 to 50 .mu.m and 4 to 20% by weight of an organic binder with solvent (5) to form a highly viscous slip (7) and is extruded to form a strand (10) having longitudinally oriented needle- and plate-shaped particles and this is dried in air, calcined and sintered to form a fiber (13).
Claims4
A method for producing a wire- or band-shaped ceramic high-temperature superconductor based on a super-conducting ceramic of the YBa.sub.2 Cu.sub.3 O.sub.6.5+y class with 0<y<1, wherein 80 to 95% by weight of an ultra-fine grained powder (1) of globulitic particles having a maximum diameter of 1 .mu.m of a high-temperature superconductor ceramic of the YBa.sub.2 Cu.sub.3 O.about..sub.7 composition or of an intermediate product of the YBa.sub.2 Cu.sub.3 O.about..sub.5 composition are mixed with 0.5 to 3% by weight of a powder (3) of needle- and plate-shaped particles, having a length of 10 to 50 .mu.m measured over the longest axis, of a high-temperature superconductor ceramic of the YBa.sub.2 Cu.sub.3 O.apprxeq..sub.7 composition or of an intermediate product of the YBa.sub.2 Cu.sub.3 O.apprxeq..sub.5 composition and 4 to 20% by weight of an organic binder in a solvent (5), are mixed, dispersed and suspended to form a suspension in such a manner that a highly viscous slip (7) is created which is processed by extrusion or spinning to form a viscous strand (10) having longitudinally oriented needle- and plate-shaped particles and wherein the said strand (10) is dried and slowly heated in air step by step to 650.degree. C. and finally to 850.degree. to 950.degree. C., during which process the organic components are decomposed, H.sub.2 O and CO.sub.2 are expelled and the whole is sintered to form a fiber (13) of longitudinally oriented crystallites of the high-temperature superconductor.
A method for producing a wire- or band-shaped ceramic high temperature superconductor based on a superconducting ceramic of the (SE)Ba.sub.2 Cu.sub.3 O.sub.6.5+y class wherein SE is a rare earth metal and o<y<1, wherein 80 to 95% by weight of an ultra fine-grained powder (1) of globulitic particles having a maximum diameter of 1.mu.m of a high temperature superconductor ceramic of the (SE)Ba.sub.2 Cu.sub.3 O.sub.6.5.apprxeq.7 composition or of an intermediate product of the (SE)Ba.sub.2 Cu.sub.3 O.sub.6.5.apprxeq.5 composition are mixed with 0.5 to 3% by weight of a powder (3) of needle- and plate-shaped particles, having a length of 10 to 50 .mu.m measured over the longest axis, of a high temperature superconductor ceramic of the (SE)Ba.sub.2 Cu.sub.3 O.sub..apprxeq.7 composition or of an intermediate product of the (SE)Ba.sub.2 Cu.sub.3 O.sub..apprxeq.5 composition and 4 to 20% by weight of an organic binder in a solvent (5), are mixed, dispersed and suspended to form a suspension in such a manner that a highly viscous slip (7) is created which is processed by extrusion or spinning to form a viscous strand (10) having longitudinally oriented needle- and plate-shaped particles and wherein the said strand (10) is dried and slowly heated in air step by step to 650.degree. C. and finally to 850.degree. to 950.degree. C., during which process the organic components are decomposed, H.sub.2 O and CO.sub.2 are expelled and the whole is sintered to form a fiber (13) of longitudinally oriented crystallites of the high-temperature superconductor.
Dependencies are inferred from the claim text.