Rapid production of bulk shapes with improved physical and super

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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419 49, 419 20, 419 21, 419 22, 419 19, 505739, 505780, 505781, 505823, H01L 3912, H01L 508, H01L 3924

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049754149

ABSTRACT:
The method of producing a superconducting product includes: providing a pressed-powder preform consisting essentially of REBa.sub.2 Cu.sub.3 O.sub.x where 6.0<x<7.0; preheating the preform to elevated temperature for a time period between 0 and 10 minutes, within a medium consisting of a mixture of refractory ceramic particles, carbonaceous particles and ultra fine graphitic particles; providing a preheated grain bed and embedding the heated preform in that bed, the bed having the same composition as the medium; and consolidating the preform to at least about 95% of theoretical density by application of pressure to the grain bed, thereby to form the product.

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