Patent ID: 6272731
Filing Date: 2001-08-14
Classification: H01L,Y10T

Abstract:
A powder in tube type method of making an HTc super-conductive multifilament strand with a silver-based matrix, comprising the steps, in the following order, of:filling, in a preliminary monofilament step, a first silver-based envelope with powder reagents suitable, after heat treatment, for transforming into an I-ITc super-conductive material in a billet;drawing down the resulting billet into a monofilament strand with a cross-section that is substantially one of square and rectangular in shape;electrically insulating at least one face of the monofilament strand;cutting said monofilament strand into lengths in a first multifilament step and filling a secondary silver-based envelope of substantially one of square and rectangular section with the resulting lengths, thereby making a multifilament billet,drawing down the multifilament billet in turn to form a multifilament strand of substantially one of square and rectangular section;cutting, in a secondary multifilament step, that is performed at least once, said multifilament strand into lengths and filling a new silver-based envelope of substantially one of square and rectangular section with the resulting lengths, thereby making a new multifilament billet,drawing down the new multifilament billet in turn to form a new multifilament strand of substantially one of square and rectangular section;shaping the new multifilament strand; andapplying heat treatment to the shaped strand.