Kabushiki Kaisha Kobe Seiko Sho

Other

Kobe Steel, Ltd.

Japan Superconductor Technology Inc.

Takayoshi Miyazaki

Kyoji Zaitsu

Hiroyuki Kato

Takayuki Miyatake

Kyoji Tachikawa

Koji Inoue

Kenichi Inoue

Takashi Hase

Taiji Mizuta

Mitsuo Tomonaga

Fumio Morimune

Satoshi Kizaki

Yukinobu Murakami

Hiroyuki Yasunaka

Provided are a multi-phase transformer having an easier-producible structure, and a transformation system wherein a plurality of such transformers are serially connected. Disclosed is a three-phase transformer (Tra) provided with three coils () and a pair of magnetic members () respectively provided on opposite ends in the axial direction of the coils (), wherein the coils () are respectively provided with first and second sub-coils ().

Multi-phase transformer and transformation system

A precursor for manufacturing a NbSn superconducting wire according to the present invention includes a mono-element wire including a Sn or Sn-based alloy core disposed at the, a Cu or Cu-based alloy matrix and a plurality of Nb or Nb-based alloy filaments surrounding the Sn or Sn-based alloy core, and a diffusion barrier layer and a stabilizing copper layer surrounding the Cu or Cu-based alloy matrix. In a final shape after a reduction process, the average diameter of the Nb or Nb-based alloy filaments is set to 5 &#x3bc;m to 30 &#x3bc;m, and the average distance between the Sn or Sn-based alloy core and the Nb or Nb-based alloy filaments nearest the Sn or Sn-based alloy core is set to 100 &#x3bc;m or less.

[object Object]

A method for manufacturing a powder-metallurgy processed NbSn superconducting wire is provided. In the method, a sheath made of Nb or a Nb alloy is filled with a raw material powder containing Sn. The sheath filled with the raw material powder is subjected to diameter reduction to form a wire. The wire is heat-treated to form a superconducting phase at the internal surface of the sheath. The raw material powder is prepared by adding a Sn powder to a Cu&#x2014;Sn alloy powder or a Cu&#x2014;Sn intermetallic compound powder, and is compacted under isotropic pressure.

Disclosed is a manufacturing method of an NbSn superconductive wire using a powder technique, the method including the steps of: filling, as a raw powder, an intermetallic compound powder obtained from a metallic powder containing at least one metallic powder selected from Ta powder and Nb powder, and Sn powder, or a mixture of the metallic powder and the Sn powder into a sheath made of Nb or an Nb based alloy; performing a diameter-reduction process on the sheath to form a wire; heat treating the wire; and, forming a superconductive layer on the interface between the sheath and the powder, wherein at least one of the metallic powders selected from the Ta powder and the Nb powder is obtained by aggregating fine particles (primary) in shape of coral to form secondary particles.

A method for producing an NbSn superconductive wire material using a powder process is provided, in which a powdered raw material is filled in a sheath made of Nb or an Nb-based alloy, and the above sheath is subjected to diameter reduction to form a wire, followed by heat treatment to form a superconducting layer at the interface between the sheath and the filled powder. The above powdered raw material contains powdered Sn, powdered Cu, and a powdered alloy or a powdered intermetallic compound, which is formed from Sn and at least one metal selected from the group consisting of Ti, Zr, Hf, V, and Ta.

A method for producing a copper alloy ingot with suppressed casting defects, segregation of components and lower oxide content comprising heating a copper alloy material in a graphite crucible to melt the copper alloy material. The molten alloy in the graphite crucible is cooled from the bottom of the crucible so that the molten alloy solidifies in a single direction.

Growing community of inventors

Kobe, Japan

Takayoshi Miyazaki