Method for producing a wire- or band-shaped ceramic superconductor

Claim 1

A method for producing a wire- or band-shaped ceramic high-temperature superconductor based on a super-conducting ceramic of the YBa 2 Cu 3 O 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 μm of a high-temperature superconductor ceramic of the YBa 2 Cu 3 O˜ 7 composition or of an intermediate product of the YBa 2 Cu 3 O˜ 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 μm measured over the longest axis, of a high-temperature superconductor ceramic of the YBa 2 Cu 3 O≈ 7 composition or of an intermediate product of the YBa 2 Cu 3 O≈ 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° C. and finally to 850° to 950° C., during which process the organic components are decomposed, H 2 O and CO 2 are expelled and the whole is sintered to form a fiber (13) of longitudinally oriented crystallites of the high-temperature superconductor.

Claim 2

A method for producing a wire- or band-shaped ceramic high-temperature superconductor based on a super-conducting ceramic of the YBa 2 Cu 3 O 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 μm of a high-temperature superconductor ceramic of the YBa 2 Cu 3 O˜ 7 composition or of an intermediate product of the YBa 2 Cu 3 O˜ 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 μm measured over the longest axis, of a high-temperature superconductor ceramic of the YBa 2 Cu 3 O≈ 7 composition or of an intermediate product of the YBa 2 Cu 3 O≈ 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° C. and finally to 850° to 950° C., during which process the organic components are decomposed, H 2 O and CO 2 are expelled and the whole is sintered to form a fiber (13) of longitudinally oriented crystallites of the high-temperature superconductor.

Claim 5

A method for producing a wire- or band-shaped ceramic high temperature superconductor based on a superconducting ceramic of the (SE)Ba 2 Cu 3 O 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 1μm of a high temperature superconductor ceramic of the (SE)Ba 2 Cu 3 O 6 .5≈7 composition or of an intermediate product of the (SE)Ba 2 Cu 3 O 6 .5≈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 μm measured over the longest axis, of a high temperature superconductor ceramic of the (SE)Ba 2 Cu 3 O.sub.≈7 composition or of an intermediate product of the (SE)Ba 2 Cu 3 O.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° C. and finally to 850° to 950° C., during which process the organic components are decomposed, H 2 O and CO 2 are expelled and the whole is sintered to form a fiber (13) of longitudinally oriented crystallites of the high-temperature superconductor.

Claim 6

A method for producing a wire- or band-shaped ceramic high temperature superconductor based on a superconducting ceramic of the (SE)Ba 2 Cu 3 O 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 1μm of a high temperature superconductor ceramic of the (SE)Ba 2 Cu 3 O 6 .5≈7 composition or of an intermediate product of the (SE)Ba 2 Cu 3 O 6 .5≈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 μm measured over the longest axis, of a high temperature superconductor ceramic of the (SE)Ba 2 Cu 3 O.sub.≈7 composition or of an intermediate product of the (SE)Ba 2 Cu 3 O.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° C. and finally to 850° to 950° C., during which process the organic components are decomposed, H 2 O and CO 2 are expelled and the whole is sintered to form a fiber (13) of longitudinally oriented crystallites of the high-temperature superconductor.