Substrate for superconducting wire, production method therefor, and superconducting wire
This invention provides a substrate for a superconducting wire used for manufacturing a superconducting wire with excellent superconductivity and a method for manufacturing the same. Such substrate for a superconducting wire exhibits the crystal orientation of metals on the outermost layer, such as a c-axis orientation rate of 99% or higher, a Δω of 6 degrees or less, and a percentage of an area in which the crystal orientation is deviated by 6 degrees or more from the (001) [100] per unit area of 6% or less.
1. A substrate for a superconducting wire, wherein the crystal orientation of metals on the outermost layer exhibits a c-axis orientation rate of 99% or higher, a Δω of 6 degrees or less, and a percentage of an area in which the crystal orientation is deviated by 6 degrees or more from the (001) [100] per unit area of 6% or less,
wherein the crystal orientation deviation is observed via the electron back scatter diffraction (EBSD) method.
2. The substrate for a superconducting wire according to claim 1 , wherein the crystal orientation of metals on the outermost layer exhibits a Δφ of 6 degrees or less.
3. The substrate for a superconducting wire according to claim 2 , wherein the crystal orientation of metals on the outermost layer exhibits Δω and Δφ of less than 5 degrees.
4. The substrate for a superconducting wire according to claim 1 , wherein the outermost layer is made of copper, nickel, or an alloy thereof.
5. The substrate for a superconducting wire according to claim 1 , wherein the substrate for a superconducting wire comprises a non-magnetic metal plate and a metal layer having the outermost layer superposed thereon.
6. The substrate for a superconducting wire according to claim 5 , wherein the non-magnetic metal plate is made of stainless steel or a nickel alloy.
7. A method for manufacturing the substrate for a superconducting wire according to claim 1 ,
the method comprising forming, via thermal treatment, a layer exhibiting a c-axis orientation rate of 99% or higher, a Δω of 6 degrees or less, and a percentage of an area in which the crystal orientation is deviated by 6 degrees or more from the (001) per unit area of 6% or less.
8. A superconducting wire comprising the substrate for a superconducting wire according to claim 1 , an intermediate layer superposed thereon, and a superconducting layer superposed thereon.
9. The substrate for a superconducting wire according to claim 1 , wherein the substrate for a superconducting wire comprises a non-magnetic metal plate, a layer of copper or a copper alloy superposed on the non-magnetic metal plate, and the outermost protective layer consisting of nickel or a nickel alloy formed on the layer of copper or the copper alloy.
10. The substrate for a superconducting wire according to claim 9 , wherein the outermost protective layer consists of a plated film of nickel or the nickel alloy.