| 摘要 |
PURPOSE:To shorten its manufacturing process, by providing a non-superconducting material in such a manner that it passes through each element wire in a superconducting wire rod in which a number of filaments made of plural superconducting element wires are collected. CONSTITUTION:A Cu bar 3mm in diameter is covered at its outer periphery by a sheet of Nb and is inserted into a hole provided through the center portion of a 35mm diameter wire made of an NbTi alloy, and some pieces of wire made of the alloy are inserted into a Cu billet 4 of 453mm in diameter and hot-extruded and drawn, and Cu is detached therefrom during the process so as to form superconducting element wire 1 of hexagonal section. Next, two hundred and fifty-three pieces of element wire 1 are packed in a 453mm diameter billet 2 which is made from an Ni alloy containing - 10 parts Cu and which is covered at its outer periphery with Nb, and there the pieces are hot-extruded and formed as hexagonal secondary element wires each 3.15mm in size at its opposite sides. Then one hundred and fifty-one pieces of element wire 1 are packed in the 453mm diameter Cu billet 4 and hot-extruded to form hexagonal, tertiary element wires 5 each 2.6mm in size at its opposite sides, and two hundred and forty-one pieces of element wire 5 are packed in a Cu billet 4' of 453mm in diameter to reduce the diameter of each piece so as to form a superconducting wire rod 6 of less than 10mm in wire diameter. Each element wire 1 in the wire rod 6 is then kept in its condition where a peening center 8 of 3.7mm in diameter is inserted therein. |
