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US 6,207,619 B1Granted
Oxidic superconductor with a bismuth phase of the 2223 type and method of manufacture thereof
AssigneeSiemens Aktiengesellschaft
InventorsBernhard Fischer, Jens Mueller
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Abstract
A superconductor with the Bi 2223 high Tc phase is manufactured by mulitply deforming and annealing a structure composed of a material matrix and at least one core of a fabricated material of the superconductor material. At least during an initial segment of a cooling process following the final annealing, the oxygen partial pressure is lowered with decreasing temperature at least in a temperature range between 800° C. and 750° C. for stabilizing the 2223 phase. A rapid cooling to room temperature advantageously follows.
Claims16
A method for manufacturing a superconductor comprising the following steps:
- embedding a conductor core in a conductive matrix material to form a structure, the conductor core comprising a bismuth-containing, oxidic superconductor material with a high transition temperature Tc of a 2223 phase;
- combination shaping and annealing the structure with a plurality of shaping steps and a plurality of annealing steps;
- final annealing the structure wherein a formation of a high part of the high Tc phase in the conductor core occurs at predetermined temperature conditions exceeding 835° C. in an atmosphere comprising a partial pressure of oxygen;
- and
- cooling the structure in said atmosphere in a temperature interval at least between 800° C. and 750° C. while lowering the oxygen partial pressure of the atmosphere while substantially maintaining stability of the 2223 phase.
2 more elements
Dependencies are inferred from the claim text.