Sumitomo Electric Industries, Limited

Sumitomo Electric, Ltd.

Tetsuji Jodai

Shuji Yazu

Hideo Itozaki

Saburo Tanaka

Nobuhiko Fujita

Naoji Fujimori

Keizo Harada

Susumu Yamamoto

Nozomu Kawabe

Teruyuki Murai

Tomoyuki Awazu

Kenichiro Sibata

Kenjiro Higaki

Nobuyuki Sasaki

Takeshi Yamaguchi

Tadakazu Kobayashi

Takahiro Imai

Noriyuki Yoshida

Kazuo Sawada

Satoshi Takano

Noriki Hayashi

Kenji Miyazaki

Kazuya Ohmatsu

Hisao Hattori

Kouichi Iwata

Kazuhisa Yamauchi

Hiroyuki Fujikawa

Sigeki Isojima

Kazuhiko Hayasi

Tetsuya Ishida

Tomoji Gotoh

Syuji Yazu

Nozumu Kawabe

Process for manufacturing a superconducting composite

A high-temperature superconducting thin film of compound oxide selected from the group consisting of:

Superconducting thin film and a method for preparing the same

A process for manufacturing a superconducting elongated article such as a superconducting wire which is applicable for manufacturing a superconducting coil or the like. The process includes steps comprising filling a metal pipe with material powder of ceramic consisting of compound oxide having superconductivity, performing plastic deformation of the metal pipe filled with the ceramic metal powder to reduce the cross section of the metal pipe, and then subjecting the deformed metal pipe to heat-treatment to sinter the ceramic material powder filled in the metal pipe. The ceramic material powder may contain compound oxide having Perovskite-type crystal structure exhibiting superconductivity. The metal pipe may selected from a group comprising metals of Ag, Au, Pt, Pd, Rh, Ir, Ru, Os, Cu, Al, Fe, Ni, Cr, Ti, Mo, W and Ta and alloys including these metals as the base. The heat-treatment may be carried out at a temperature ranging from 700 to 1,000.degree. C., The plastic deformation of the metal pipe filled with the ceramic metal powder may be performed in such manner that the cross section of the metal pipe is reduced at a dimensional reduction ratio ranging from 16% to 92% by wire-drawing or forging by means of dies, roller dies, or extruder.

Process for manufacturing a superconducting wire of compound oxide-type

A semiconductor substrate comprising a single crystal substrate base such a silicon and a superconducting thin film layer deposited on said substrate base and composed of compound oxide such as Ln.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-.delta.. (Ln is lanthanide).

Semiconductor substrate having a superconducting thin film

A continuous method for manufacturing an elongated superconducting campsite composed of a superconductor consisting of compound oxided and a metal sheath surrounding the superconductor, including the steps of kneading a material powder of superconducting compound oxide with a binder, continuously shaping the resulting kneaded paste into an elongated pre-form by an extruder or by coating technlque, heating the pre-form continuously to remove said binder, wrapping the pre-form with a metallic sheet, and then subjecting the pre-form from wrapped with the metallic sheet to sintering operation to sinter said material powder.

Superconducting composite comprising a matrix made of superconducting sintered mass composed of perovskite type or quasi-perovskite type oxide and metal phase dispersed in the superconducting mass with a proportion of from 10 to 70 volume % with respect to said composite. The metal phase may consist of at least one of Cu, Ag, Au, Pt, Ni and Zn or their alloys. The superconducting sintered mass may be Ba-Y-Cu-O type compound oxide.

Superconducting composite

An outer surface of a superconducting thin film of compound oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-.delta. deposited on a substrate such as MgO and SrTiO.sub.3 is protected with a protective layer which is composed of amorphous inorganic material such as inorganic glass, amorphous oxide.

A process for producing a composite oxide superconducting wire is disclosed, which comprises the steps of compacting material powder for an oxide superconductor in a noble metal pipe; heating the metal pipe filled with the material powder at a temperature ranging between an upper limit corresponding to the lowest melting point of any one of constituent components in the material powder and a lower limit which is lower by 100.degree. C. than said upper limit to sinter the material powder and cooling the product at a cooling velocity of less than 50.degree. C./min, and further including a series of wire-drawing, annealing and sintering steps. Furthermore, an intermediate layer of noble metal can be interposed between the oxide superconductor and the metal pipe.

Process for manufacturing a composite oxide superconducting wire

A semiconductor substrate having a silicon substrate and a superconducting thin film layer composed of compound oxide such as Ln.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-.delta. (Ln is lanthanide) and stratified on the silicon substrate, characterized in that an intermediate semiconductor layer composed of compound semiconductor material such as GaAs is interposed between the silicon substrate and the superconducting thin film layer.

A process for preparing a thin film of superconducting material is disclosed in which films are deposited from a defined target. The thin films prepared by the process are characterized by high critical temperature of superconductivity and a smaller discrepancy between the critical temperature and the onset temperature at which superconductivity is observed.

Process for preparing high Tc superconducting material

A superconducting composite comprising a compound oxide type superconductor and an outer metal pipe on which said superconductor is supported, characterized in that (i) said outer metal pipe is made of at least one of metals selected from a group comprising gold, silver and platinum metals and their alloys or (ii) an intermediate layer made of these precious metals is interposed between the compound oxide and the metal pipe. The composite may be in a form of a solid pipe or a hollow pipe having a superconducting thin layer deposited on an inner surface of the metal pipe.

A process for producing a superconducting material comprising a compound oxide represented by the general formula:

Process for preparing superconducting material

A process for producing a sintered ceramic wire, particularly a superconducting wire, by the steps of filling a metal pipe with a material powder of ceramic, wire drawing the metal pipe filled with the material powder by means of roller dies and then subjecting a composite of the metal pipe and the material powder to a heating operation to sinter the ceramic powder.

Process for producing sintered ceramic wire

This invention relates to new superconducting material having a composition represented by the general formula:

Growing community of inventors

Hyogo, Japan

Tetsuji Jodai