Abstract: The problem addressed by the present invention is to provide a copper-coated aluminum wire material with a reduced weight and excellent adhesiveness, and a production method therefor. This copper-coated aluminum wire material is provided with an aluminum wire material comprising aluminum or an aluminum alloy and a thin copper film covering the aluminum wire material. The space factor of the thin copper film is in the range of 0.2% to 4% and the adhesiveness between the aluminum wire material and the thin copper film based on a scratch test compliant with JIS R 3255 is at least 10 mN.

Abstract: In a fabrication method of a MgB2 superconducting tape and wire by filling a tube with a MgB2 superconducting powder and forming it into a tape or wire, a fabrication method of a MgB2 superconducting tape (and wire) which is characterized by using a MgB2 superconducting powder having a high critical current density (Jc) owing to its lowered crystallinity and having potential for excellent grain connectivity as the MgB2 superconducting powder. Provided are a fabrication method of a MgB2 superconducting tape and wire which can fabricate a MgB2 superconducting tape and wire having a level of Jc sufficiently high for practical applications and homogeneous quality throughout its length by an ex-situ process employing a material of the composition suitable for its working environment as the sheath material, and a MgB2 superconducting tape and wire thereby fabricated.

Abstract: The present invention provides a method for producing a MgB2 superconductor, comprising compacting and heating a mixture comprising Mg or MgH2 powder and B powder, wherein said mixture comprises SiC powder and an aromatic hydrocarbon, and a MgB2 superconductor having a higher critical current density (Jc) than that of the known MgB2 superconductors added SiC only or added an aromatic hydrocarbon only such as benzene.

Abstract: By adding an aromatic hydrocarbon such as benzene to the powder mixture of magnesium (Mg) or magnesium hydride (MgH2) and boron (B) as raw materials of a superconductor MgB2, high superconducting critical current density (Jc) is obtained.

Abstract: In a metal sheath MgB2 superconducting wire, it is intended to achieve a wire having increased current density and a long length at the same time, by densitying superconducting core part. The superconducting wire is manufactured by forming diffusion hardened layer on the inner surface of the sheath such that the hardness of the inner surface becomes higher than that of the outer surface, filling MgB2 superconductor, and further if necessary, a critical current density increasing material such as indium, copper, and tin, in a metal sheath, to subject it to wire drawing. For the metal sheath, a material with toughness such as steel is used. Even if the sheath is made to a long wire, it does not break, thereby, enabling to density superconducting core part.

Abstract: In a metal sheath MgB2 superconducting wire, it is intended to achieve a wire having increased current density and a long length at the same time, by densitying superconducting core part. The superconducting wire is manufactured by forming diffusion hardened layer on the inner surface of the sheath such that the hardness of the inner surface becomes higher than that of the outer surface, filling MgB2 superconductor, and further if necessary, a critical current density increasing material such as indium, copper, and tin, in a metal sheath, to subject it to wire drawing. For the metal sheath, a material with toughness such as steel is used. Even if the sheath is made to a long wire, it does not break, thereby, enabling to density superconducting core part.

Abstract: In a fabrication method of a MgB2 superconducting tape and wire by filling a tube with a MgB2 superconducting powder and forming it into a tape or wire, a fabrication method of a MgB2 superconducting tape (and wire) which is characterized by using a MgB2 superconducting powder having a high critical current density (Jc) owing to its lowered crystallinity and having potential for excellent grain connectivity as the MgB2 superconducting powder. Provided are a fabrication method of a MgB2 superconducting tape and wire which can fabricate a MgB2 superconducting tape and wire having a level of Jc sufficiently high for practical applications and homogeneous quality throughout its length by an ex-situ process employing a material of the composition suitable for its working environment as the sheath material, and a MgB2 superconducting tape and wire thereby fabricated.

Abstract: The present invention provides a method for producing a MgB2 superconductor, comprising compacting and heating a mixture comprising Mg or MgH2 powder and B powder, wherein said mixture comprises SiC powder and an aromatic hydrocarbon, and a MgB2 superconductor having a higher critical current density (Jc) than that of the known MgB2 superconductors added SiC only or added an aromatic hydrocarbon only such as benzene.

Abstract: By adding an aromatic hydrocarbon such as benzene to the powder mixture of magnesium (Mg) or magnesium hydride (MgH2) and boron (B) as raw materials of a superconductor MgB2, high superconducting critical current density (Jc) is obtained.

Abstract: The invention provides a superconducting wire rod which is filled with or interiorly includes a superconductor containing a boron, wherein the superconducting wire rod has a practical critical electric density even under a magnetic field. In a superconducting wire rod filled with or interiorly including a superconductor containing a boron, a metal powder is added to a superconducting material included in the superconducting wire rod, the metal powder is selected from at least one of an indium, a tin, a lead, an iron, a magnesium and an aluminum, the metal power having an average grain diameter equal to or less than 20 &mgr;m is 5 to 25 vol % dispersed in the superconducting material, a density of the superconducting material included in the superconducting wire rod after a final work is equal to or more than 90% a theoretical density, and a critical current density is equal to or more than 1000 A/cm2.

Abstract: A method of producing a composite material of a bismuth 2212 phase and a metallic substrate, wherein the first and second baking are conducted as an isothermal heat treatment. According to this process, temperature control is easy, high productivity is obtained, and the critical current density is improved.

Abstract: A method of producing a composite material of a bismuth 2212 phase and a metallic substrate, wherein the first and second baking are conducted as an isothermal heat treatment.

Abstract: In a process in which a composite consisting of a metallic base and a superconductor mainly containing a Bi2Sr2CaCu2Ox superconducting phase is formed into a composite wire or wire, the composite is subjected to calcination and cold working before heat treatment for crystallization from a partial molten state.