Patent ID: 6442827
Filing Date: 2002-09-03
Classification: H01L,Y10S,Y10T

Abstract:
A power in tube type method of manufacturing HTc superconductor multifilament conductor having a matrix of compatible silver alloy, said method comprising the steps of:a square or rectangular section monofilament having a sheath of compatible silver alloy and a core of HTc superconductor precursors; cutting up said monofilament into segments and filling a square or rectangular section case of non-compatible silver alloy with the resulting segments, the segments being placed in superposed layers centered in the case of non-compatible silver alloy, each layer being offset relative to the preceding layer so as to form a staggered configuration of the segments; filling the gaps left by the offset at the being and ends of the layers with bars of compatible silver alloy, thereby making a multifilament billet that is symmetrical about a superposition midplane; and applying mechanical and heat treatments 20 respectively to obtain the final shape of the multifilament strand and to synthesize the precursors into the HTc superconductor phase; wherein said method comprises the step of, during preparation of the multifilament billet, organizing the number of segments per layer so that, in cross-section, the segment layers viewed as a whole have the general shape of a converging-diverging nozzle, the throat of the converging-diverging nozzle shape being substantially contained in said superposition midplane; and wherein said method further comprises the step of, during the mechanical treatment of said multifilament billet preceding the synthesis heat treatment, applying a rolling force in a direction perpendicular to the superposition midplane, and cutting off at least one of the side edges of the rolled billet perpendicularly to the superposition midplane, thereby revealing the matrix of compatible silver alloy.