The present invention is a superconducting wire including: a wire formed of a superconducting material; and a superconducting stabilization material disposed in contact with the wire, in which the superconducting stabilization material is formed of a copper material which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass; a balance being Cu and inevitable impurities, and in which a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.

A quantity of continuously cast Mg brass is made by the step of melting a charge of Mg brass and then continuously casting a rod of the Mg brass through a casting die. The casting die has been previously treated by continuously casting a melt of copper or brass through it to clean out Mg deposits formed by an earlier continuous casting of Mg brass which formed the Mg deposits. The quantity of continuously cast Mg brass may be in the form of EDM wire. These methods may be used to purify scrap or used brass, by removing metal oxides to improve the material quality, thus reducing the need to use premium priced virgin copper and zinc.

A wire rod of a Cu—Zn—Si based alloy obtained by up-drawing continuous casting is provided; the amount of Cu is within a range of 75.0 mass% or more and 76.9 mass% or less, the amount of Si is within a range of 2.6 mass% or more and 3.1 mass% or less, the amount of Zr is within a range of 0.003 mass% or more and 0.20 mass% or less, the amount of P is within a range of 0.02 mass% or more and 0.15 mass% or less, the balance is composed of Zn and inevitable impurities, and the number density of a Zr—P compound containing Zr and P is within a range of 1500 pieces/mm.sup.2 or more and 7000 pieces/mm.sup.2 or less.

An aluminum alloy wire rod having a composition comprising Mg: 0.1-1.0 mass %, Si: 0.1-1.2 mass %, Fe: 0.10-1.40 mass %, Ti: 0-0.100 mass %, B: 0-0.030 mass %, Cu: 0-1.00 mass %, Ag: 0-0.50 mass %, Au: 0-0.50 mass %, Mn: 0-1.00 mass %, Cr: 0-1.00 mass %, Zr: 0-0.50 mass %, Hf: 0-0.50 mass %, V: 0-0.50 mass %, Sc: 0-0.50 mass %, Co: 0-0.50 mass %, Ni: 0-0.50 mass %, and the balance: Al and inevitable impurities, wherein a number of compound particles present on a surface and having a diameter of greater than or equal to 1 μm in terms of equivalent circle diameter is less than or equal to one per 100 μm.sup.2, and a tensile strength is greater than or equal to 200 MPa.

An aluminum alloy wire rod having a composition including Mg: 0.10-1.00 mass %, Si: 0.10-1.00 mass %, Fe:0.01-1.40 mass %, Ti:0-0.100 mass %, B: 0-0.030 mass %, Cu: 0-1.00 mass %, Ag: 0-0.50 mass %, Au: 0-0.50 mass %, Mn: 0-1.00 mass %, Cr: 0-1.00 mass %, Zr: 0-0.50 mass %, Hf: 0-0.50 mass %, V: 0-0.50 mass %, Sc: 0-0.50 mass %, Sn: 0-0.50 mass %, Co: 0-0.50 mass %, Ni: 0-0.50 mass %, and the balance: Al and inevitable impurities, wherein a ratio of (standard deviation of crystal grain size of the aluminum alloy wire rod)/(average crystal grain size of the aluminum alloy wire rod) is less than or equal to 0.57, and a ratio of (diameter of the aluminum alloy wire rod)/(average crystal grain size of the aluminum alloy wire rod) is greater than or equal to 10.

Disclosed are a micro fiber and a method of manufacturing the micro fiber are proposed. The micro fiber may be manufactured by controlling thickness and Young's modulus thereof using hollow fiber.

Disclosed are a micro fiber and a method of manufacturing the micro fiber are proposed. The micro fiber may be manufactured by controlling thickness and Young's modulus thereof using hollow fiber.

A method for manufacturing a bonding wire includes: putting a surface layer metal of a bonding wire in a crucible having a die cooler provided at the lower part thereof and melting the same; putting a main component metal core of the bonding wire in a core guide located at the upper part of the die cooler of the crucible and heating the core guide to the melting point or below of the metal core; transferring the metal core toward the die cooler so as to allow the molten surface layer metal to be injected to the surface of the metal core; and manufacturing a 50 μm to 350 μm bonding wire from the cast wire precursor by using a drawing die.

A metal member according to this invention is composed of polycrystals of a metal made of ruthenium or an alloy containing ruthenium at a maximum ratio. The aspect ratio of a crystal grain of the polycrystalline metal member is 1.5 or more. A plurality of crystal grains forming the metal member are arranged with their major axes being pointed in the same direction, and the number of crystal grains in a section in the major axis direction of the crystal grains is 120 or less per 1 mm.sup.2.

The present invention is a superconducting wire including: a wire formed of a superconducting material; and a superconducting stabilization material disposed in contact with the wire, in which the superconducting stabilization material is formed of a copper material which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass; a balance being Cu and inevitable impurities, and in which a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.