Patent ID: 8993064
Filing Date: 2015-03-31
Classification: B32B,C21D,C22C,C22F,H01L,Y10T

Abstract:
1. A method for manufacturing a substrate for a superconducting compound, the method comprising the steps of: removing an absorbed material on a surface of a cold-rolled copper foil by applying sputter etching to the surface of the cold-rolled copper foil, the cold-rolled copper foil having an absorbed material on the surface thereof and having been cold-rolled at a draft of 90% or more; applying sputter etching to a surface of a nonmagnetic metal sheet; applying together the surfaces which have been sputter etched of the cold-rolled copper foil and the nonmagnetic metal sheet, and forming a laminated body having a copper layer on the metal sheet by bonding the copper foil which has been cold-rolled at a draft of 90% or more and the metal sheet to each other by applying pressure to the copper foil and the metal sheet using reduction rolls; heating the laminated body and diffusing copper in the copper layer into the metal sheet while simultaneously providing a degree 4 of biaxial crystal orientation of the copper layer of 6° or less by heating with a copper diffusion distance of 10 nm or more so that the adhesion strength between the copper layer and the metal sheet is enhanced to 3 N/cm or more in terms of 180° peel strength; and laminating a protective layer having biaxial crystal orientation which indicates values of 6° or less in the degree of Δφ to a surface of the copper layer of the laminated body.