Swcc Showa Cable Systems Co., Ltd.

International Superconductivity Technology Center, the Juridical Foundation

The Furukawa Electric Co., Ltd.

International Superconductivity Technology Center

Showa Electric Wire & Cable Co., Ltd.

The Juridical Foundation

International Superconductivity Technology Center, the Juridicial Foundation

International Superconductivity Technology Center, the Jurdical Foundation

Swcc Show Cable Systems Co., Ltd.

Takayo Hasegawa

Yuji Aoki

Tsutomu Koizumi

Yasuo Takahashi

Atsushi Kaneko

Hiroshi Nakamura

Tatsuhisa Nakanishi

Disclosed are an oxide superconductor tape and a method of manufacturing the oxide superconductor tape capable of improving the length and characteristics of superconductor tape and obtaining stabilized characteristics across the entire length thereof. A Y-class superconductor tape (), as an oxide superconductor tape, comprises a tape () further comprising a tape-shaped non-oriented metallic substrate (), and a first buffer layer (sheet layer) () that is formed by IBAD upon the tape-shaped non-oriented metallic substrate (); and a second buffer layer (gap layer) (), further comprising a lateral face portion () that is extended to the lateral faces of the first buffer layer (sheet layer) () upon the tape () by RTR RF-magnetron sputtering.

Oxide superconductor cabling and method of manufacturing oxide superconductor cabling

This invention provides a rare earth-type tape-shaped oxide superconductor having excellent mechanical strength and superconducting properties and a composite substrate using for the same. Non-oriented and non-magnetic Ni-9 at % W alloy tapes () were bonded onto both sides of a non-oriented and non-magnetic hastelloy tape () by a normal temperature bonding process, and an Ni-3 at % W alloy tape () having a cubic texture was bonded onto the surface of the tape () by a normal temperature bonding process. Thereafter, the heat-treatment was given in a reducing atmosphere and a bonding layer () etc. was formed on the adhesive interface of each layer. Next, a (Ce, Gd)Ointermediate layer () and a CeZrOintermediate layer () by an MOD process, a CeOintermediate layer (), a YBCO superconducting film () by a TFA-MOD method, and a silver stabilization layer () were stacked sequentially on the surface of the tape (). A critical current value (Ic) of this superconductor showed 150 A.

Rare earth-type tape-shaped oxide superconductor and a composite substrate used for the same

A tape-shaped oxide superconductor includes a 15 to 100 nm-thick Ce&#x2014;Gd&#x2014;O-based oxide layer (Ce:Gd=40:60 to 70:30 molar ratio) and a 100 nm-thick Ce&#x2014;Zr&#x2014;O-based oxide layer (Ce:Zr=50:50 molar ratio) as first and second intermediate layers are formed by MOD on an Ni-base alloy substrate having a half value width (FWHM:&#x394;&#x3c6;) of 6.5 degrees. A 150 nm-thick CeOoxide layer as a third intermediate layer is formed on the second intermediate layer by RF sputtering. A 1 &#x3bc;m-thick YBCO superconducting layer is formed by TFA-MOD on the three-layer structure. In the tape-shaped oxide superconductor, the &#x394;&#x3c6; values of the first to third intermediate layers are (6.0 to 6.5) degrees, (6.0 to 6.6) degrees, and (6.0 to 6.6) degrees, respectively, and the Jc value of the YBCO superconducting layer in liquid nitrogen is 1.8 to 2.2 MA/cm.

Tape-shaped oxide superconductor

This invention provides a heat treatment apparatus for an oxide superconducting wire that is easy to control atmosphere during baking and can realize a high manufacturing speed. A heat treatment apparatus () comprises a heat treating furnace () and a cylindrical rotator (), rotatable about a horizontal rotating axis, provided within the heat treating furnace (). The rotator () in its cylindrical body () have a number of through-holes () formed evenly over the whole surface of the cylindrical body (). One end of the cylindrical body () is hermetically sealed by a lid. On the other end, a gas discharge pipe () for discharging gas within the cylindrical body to the outside of the heat treating furnace () is connected to the lid. A plurality of gas supply pipes () are symmetrically provided separately from each other on the outer surface of the cylindrical body (). A number of gas jet holes are formed in each of the gas supply pipe () so as to jet atmosphere gas toward the surface of the cylindrical body. A tape-shaped wire () formed of a precursor film of a YBCO superconducting layer is wound around the rotator () for heat treatment for superconductor formation.

Heat treatment apparatus for oxide superconducting wire

RE superconductive layer excelling in Jc and Tc is formed on an interlayer capable of preventing cracking and diffusion of substrate-constituting Ni element into YBCO layer and excelling in crystallinity and surface smoothness. The interlayer is formed by coating a surface of metal substrate with a mixed solution composed of an organometallic acid salt of cerium, an organometallic acid salt of a solid solution formation element capable of forming a solid solution with cerium and an organometallic acid salt of a charge compensation element capable of compensating for a charge mismatch attributed to a difference between the electron valences of respective ions of cerium and the solid solution formation element and subsequently carrying out heat treatment in a reducing atmosphere of 900 to 1200&#xb0; C. whose pressure ranges from 0.1 Pa to below atmospheric pressure. Thereafter, a rare earth oxide superconductive layer is formed on the interlayer.

Rare earth oxide superconductor and process for producing the same

On a first intermediate layer provided on a substrate and having an excellent surface smoothness, are formed a second intermediate layer and an YBCO superconductor layer having excellent properties. An YBCO superconductor () having a critical current density (Jc) of 1 MA/cmor higher can be produced by forming a first intermediate layer (), a second intermediate layer (), an YBCO superconductor layer () and an Ag-stabilized layer () on the surface of a tape-shaped biaxially oriented Ni&#x2014;W alloy substrate (), wherein the first intermediate layer () has a thickness of 5 nm or less, has a surface smoothness, comprises AZrO, and is formed by repeating coating and provisional burning several times by the MOD method, the second intermediate layer () comprises a CeOfilm and is formed by the pulse plating method, the YBCO superconductor layer () is formed by the MOD method, and the Ag-stabilized layer () is formed on the YBCO superconductor layer ().

Rare earth-containing tape-shaped oxide superconductor

RE superconductive layer of high critical current density (Jc) is superimposed on an interlayer formed so as to, while ensuring cracking prevention, excel in crystallinity, such as in-plane orientation degree and direction, and surface smoothness. On an oriented Ni substrate, there are sequentially superimposed an interlayer of cerium oxide loaded with 20 to 60 mol %, in terms of metal content, of one or at least two rare earth elements according to MOD technique and an RE superconductive layer of high Jc according to MOD technique. The above interlayer is formed by mixing a Gd, Y and/or Yb organometallic compound solution with a Ce organometallic compound solution, applying the mixed solution onto an oriented Ni substrate so as to form a coating film and subjecting the coating film to calcination heat treatment and thereafter firing in an Ar&#x2014;Hatmosphere at 950 to 1150&#xb0; C. under a pressure of 50 to 500 Pa. YBCO superconductive layer is formed on this interlayer according to TFA-MOD technique.

Growing community of inventors

Tokyo, Japan

Takayo Hasegawa