Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Tokai Electric Wire Company, Ltd.

Kazuo Sawada

Shinji Inazawa

Kouichi Yamada

Yoshihiro Nakai

Masanobu Nishio

Satoshi Takano

Kazuhiko Hayashi

Kengo Ohkura

Hajime Hitotsuyanagi

Kenji Miyazaki

Minoru Yokota

Atsushi Nakamura

Kazunori Tsuji

Atsuhiko Fujii

Naoyuki Ohkubo

Takao Ogino

Shigeo Ezaki

Shuzo Nagai

Seiji Watabe

Kazuhisa Yamauchi

Yasutoyo Kotani

Isao Okugawa

Hideo Itozaki

Shuji Yazu

Tetsuji Jodai

Nozomu Kawabe

Noriyuki Yoshida

Nobuhiko Fujita

Teruyuki Murai

Susumu Yamamoto

Noriki Hayashi

Kenichiro Sibata

Nobuyuki Sasaki

Junichi Kojima

Fumio Ono

Hitoshi Kishida

Kengo Okura

Tadanori Sano

Sigeki Isojima

Kazuhiko Hayasi

Saburo Yosimura

Hajime Shiraishi

Katsushi Matsuda

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 metal oxide layer is provided around a thermocouple element. The metal oxide layer is formed by preparing a sol, in which particulates of a metal oxide are dispersed, by a sol-gel method, dipping the thermocouple element in this sol, energizing the thermocouple element as a cathode for bonding the precursor particulates of the metal oxide thereto, and heat treating the same. The thermocouple according to the present invention is compact with a thin insulating layer, excellent in flexibility, and provides no gas adsorption source.

Method of making a thermocouple

A method of manufacturing a superconductor is carried out by first preparing a material composed of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7. This material is heated/molten in a platinum crucible. A melt thus obtained is drawn out from a high-temperature frame provided above the platinum crucible and heated to a temperature exceeding the melting point of the material. The melt thus drawn out is cooled by natural standing, to be solidified. As the result, an elongated superconductor composed of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7 can be obtained. This superconductor enters a superconductive state at 90 K.

Superconductor and method of manufacturing the same

Thermocouple

A method is provided for manufacturing a composite conductor having a copper or copper alloy core, a conductive ceramic intermediate layer and a nickel outer layer, and being suitable for high temperature applications. The method involves first preparing the copper or copper alloy core, then extruding a mixture of conductive ceramic power and a binder around the core to form the ceramic layer, and then applying a nickel tape as an outer covering. As further steps, a seam of the nickel tape covering is welded, the product is passed through a cladding die, and finally the product is drawn to form the desired conductor with a preselected diameter. Optionally, a further ceramic layer can be applied around the nickel layer.

Method of manufacturing composite conductor having heat resistance or

A ceramic insulated wire has a conductor core of copper or copper alloy, a stainless steel layer around the conductor core and a chromium oxide film (2A) around the stainless steel layer. The chromium oxide film (2A) is surrounded by an outer ceramic insulator formed by a vapor deposition method. Cladding the conductor core with stainless steel is done by inserting the core lengthwise into a stainless steel pipe, plastically working the resulting composite body to provide a desired size, and oxidizing the stainless steel which contains sufficient chromium for the formation of the chromium oxide film to have a thickness within the range of 10 nm to 1000 nm. The outer ceramic insulator formed by vapor deposition is made of Al.sub.2 O.sub.3, SiO.sub.2, AlN and Si.sub.3 N.sub.4 which provide an excellent heat resistance while the chromium oxide film substantially increases the bonding strength.

Ceramic insulated electrical conductor wire and method for manufacturing

A heat and oxidation resistant electrically conductive composite conductor has a core (1) made of copper or a copper alloy, an electrically conductive ceramics layer (2) around the core (1), and a nickel layer (3) on the exterior of the electrically conductive ceramics layer (2). Such a conductor is produced by coating the outer surface of the core copper alloy binder and covering the coated core with a nickel tape under an atmosphere of an inert gas or a reducing gas, welding the seam of the tape, clading the so formed conductor by a cladding die, and drawing the clad conductor. The composite conductor has a high conductivity which is not reduced even when the conductor is exposed to a high temperature operating condition.

Heat and oxidation resistant composite electrical conductor

A method of manufacturing an improved conductor wire, especially for use as wiring in audio/video devices is disclosed. The conductor consists of copper having a high purity of at least 99.9 wt. %. High purity copper starting material is formed as a rod which is then heat treated at a temperature in the range of 400.degree. C. to 700.degree. C. for 1 minute to 24 hours. The heat treated rod is then cold worked with a reduction in area of at least 65%. This method provides an electrical conductor wire which avoids irregularities of electron density and thereby eliminates phase differences in a high frequency signal, such as an audio or video signal, passing through the wire to obtain clear transmission and reproduction of an audio sound or video image. The method of the invention increases the residual resistance ratio of the conductor wire to at least 179 or by at least 20% as compared to a conventional conductor which is not heat treated according to the invention. Finally, in a quality control method, the expected audio and video transmission characteristics of a manufactured conductor wire can be evaluated by determining the residual resistance ratio of the conductor wire.

Method of manufacturing a copper electrical conductor, especially for

An insulated electrical conductor wire has a conductor core containing Ni or Ni alloy at least in its outer surface, an oxide layer of Ni or Ni alloy formed by oxidation treatment of the outer surface of the conductor, and an insulating inorganic compound outer layer formed on the oxide layer of Ni or Ni alloy. The insulating inorganic outer layer is intimately bonded to the oxide layer and provides an improved heat resistance and insulability.

Electrical conductor member such as a wire with an inorganic insulating

An insulated wire is suitable for use as a distribution wire, a wire for winding a coil or the like, which is used in a high-vacuum environment or in a high-temperature environment such as a high vacuum apparatus or a high temperature service apparatus. The insulated wire has a base material (1) forming a substrate, a chromium oxide CrO.sub.3-x containing intermediate layer (2) on the substrate, and an oxide insulating layer (3) on the intermediate layer. The base material (1) is an electrical conductor. The chromium oxide containing layer (2) is so formed that the ratio of oxygen to chromium O/Cr is not less than 0.5 but less than 1.5 to avoid the formation of chromic oxide Cr.sub.2 O.sub.3 which reduces the adhesive bonding strength. The oxide insulating layer (3) is formed by applying a precursor solution of a metallic oxide onto the chromium oxide containing layer (2) by a sol-gel method or an organic acid salt pyrolytic method. This insulated wire exhibits a high heat resistance and insulation ability as well as excellent flexibility, and does not provide any gas adsorption source when the wire is used in a vacuum device.

Insulated wire with an intermediate adhesion layer and an insulating

An electric contact is provided on at least one of a pair of conductors and includes a surface which is coated with a ceramic layer comprising at least one material selected from the group consisting of nitrides, carbides and borides of high melting point metals, this electric contact having a low contact resistance and good reliability.

Method for producing electrical contact

An electrically insulated wire which has an electrical conductor formed of a base material having an outer conductor surface and a chromium oxide containing layer formed on the outer conductor surface. An electrically insulating nitride layer is provided on the chromium oxide containing layer. The electrically insulated wire has a high insulability at high-temperatures, an excellent flexibility and does not form a gas adsorption source.

Electrical insulated wire

An insulated wire has a conductor, a first insulating metal oxide layer which is formed around the conductor, and a second insulating metal oxide layer, containing ceramic particles mixed by addition and formed around the first insulating metal oxide layer. The so formed insulating metal oxide layers are produced by changing a precursor of a metal oxide into the ceramic state. This change is caused by a method such as a sol-gel method or a thermal decomposition method. The mixed ceramic particles are more preferably in the form of fine platelets. This insulated wire has an excellent flexibility, emits no gas, can maintain its insulation even at a high temperature, and has a high breakdown voltage.

Insulated electrical conductor wire having a high operating temperature

A method of manufacturing a superconductive conductor containing a superconductive ceramic material generally expressed by the composition AaBbCc, where A represents at least a sort of element selected from a group of those belonging to the groups Ia, IIa and IIIb of the periodic table, B represent at least a single element selected from a group consisting of groups Ib, IIb and IIIa of the periodic table, C represents at least a single sort of element selected from a group of oxygen, carbon, nitrogen, fluorine and sulfur and a, b and c represent numbers showing composition ratios of A, B and C respectively, includes a step of melting a material generally expressed by a formula AaBb, a step of continuously drawing out a melt of AaBb from a hole provided in a frame, a step of solidifying the AaBb melt drawn out from the hole and a step of heating a solidified body of AaBb in an atmosphere containing C.

Method of manufacturing superconductive conductor

Method of manufacturing inorganic insulation

Growing community of inventors

Osaka, Japan

Kazuo Sawada