Ngk Insulators, Inc.

International Superconductivity Technology Center

Manabu Yoshida

Hitoshi Sakai

Hitoshi Yoshida

Toshihiro Tomita

Kenji Suzuki

Keiichiro Watanabe

Kenji Yajima

Shuichiro Oki

Kunio Nakayama

Tomonori Takahashi

Izumi Hirabayashi

Keiji Matsuhiro

Kazuyuki Kaigawa

Toshio Oda

Hideyuki Baba

Masamichi Obata

A carbon film laminatehaving a porous substrateformed of a plurality of particles and a carbon filmprovided on a surface of the porous substrate, wherein the porous substrateincludes a surface layerwhich is in contact with the carbon filmand which is formed of particleshaving a mean particle size of 0.01 to 0.11 &#x3bc;m, and a porous bodyformed of particles having a mean particle size differing from that of the particlesforming the surface layer. The invention provides a carbon film laminate which does not generate cracks and pinholes of the carbon film and which is suitable for producing thin film thereof.

Carbon film laminate and method for production thereof, and VOC removing device

A DDR type zeolite membrane formed on a substrate includes silica as a main component. The DDR type zeolite membrane separates at least one type of a gas component from a mixed gas containing at least two types of gases selected from a group consisting of carbon dioxide (CO), hydrogen (H), oxygen (O), nitrogen (N), methane (CH), normal butane (n-CH), isobutane (i-CH), sulfur hexafluoride (SF), ethane (CH), ethylene (CH), propane (CH), propylene (CH), carbon monoxide (CO), and nitrogen monoxide (NO). Each single gas permeance at room temperature and 100&#xb0; C. are different, respectively, in order to separate at least one selected gas component from the mixed gas.

Method for preparing DDR type zeolite membrane, DDR type zeolite membrane, and composite DDR type zeolite membrane, and method for preparation thereof

This invention provides a DDR type zeolite membrane, characterized in that it is formed as a membrane on a substrate and its main component is silica, and that each single gas permeance at room temperature and 100&#xb0; C. are different, respectively among at least two types of gases selected from a group consisting of carbon dioxide (CO), hydrogen (H), oxygen (O), nitrogen (N), methane (CH), normal butane (n-CH), isobutane (i-CH), sulfur hexafluoride (SF), ethane (CH), ethylene (CH), propane (CH), propylene (CH), carbon monoxide (CO), and nitrogen monoxide (NO).

A reaction vessel including an oxygen-containing gas chamber separated from a source gas chamber by an oxygen-permeable membrane that allows oxygen selectively to pass therethrough to contact and react with source gas contained in the source gas chamber. The ratio of at least one of (i) the volume of the oxygen-containing gas chamber to the total volume of the vessel and (ii) the volume of the source gas chamber to the total volume of the vessel, is outside a range within which explosion would occur if the oxygen-containing gas and source gas were allowed to combine directly. Preferably, the ratio also is outside a range within which explosion would occur if the oxygen-containing gas and products resulting from reactions between oxygen supplied through the oxygen-permeable membrane and the source gas were allowed to combine directly. The vessel is safer to operate in that the risk of explosion, due to direct mixing of the gases when the oxygen-permeable membrane is damaged or cracked, is greatly reduced.

Reaction vessel having an oxygen permeable membrane

A method for making a rare earth superconductive composite which includes a matrix of REBa.sub.2 Cu.sub.3 O.sub.7-x grains and fine particles of RE.sub.2 BaCuO.sub.5 dispersed therein. The method includes a step of forming a compacted mass of powder particles of REBa.sub.2 Cu.sub.3 O.sub.7-x and powder particles of RE.sub.2 BaCuO.sub.5, each of which has an average diameter not greater than 6 .mu.m, and a maximum diameter not greater than 20 .mu.m. The compacted mass is heated to temperature higher than an incongruent melting temperature of the REBa.sub.2 Cu.sub.3 O.sub.7-x and lower than an incongruent melting temperature of RE.sub.2 BaCuO.sub.5, and is gradually cooled such that fine particles of RE.sub.2 BaCuO.sub.5 are dispersed in REBa.sub.2 Cu.sub.3 O.sub.7-x grains. The mass is annealed in an atmosphere containing oxygen.

Method for making rare earth superconductive composite

A RE-Ba-Cu-O type oxide superconducting material (RE represents Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu or a combination of two or more of them) having a phase structure including a REBa.sub.2 Cu.sub.3 O.sub.y phase and a RE.sub.2 BaCuO.sub.5 phase of 20 .mu.m or less in diameter dispersed in the REBa.sub.2 Cu.sub.3 O.sub.y phase, in which superconducting material RE consists of at least two elements selected from Y, Cl, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu. Said oxide superconducting material can be produced by melt processing.

Oxide superconducting material and process for producing the same

An yttrium-barium-copper oxide powder consisting of a powdery mixture of Y.sub.2 BaCuO.sub.5 with Ba.sub.3 Cu.sub.5 O.sub.8, which can be formed into a dense sintered body having excellent superconducting characteristics. An yttrium-barium-copper oxide superconducting body is manufactured by firing the above powder preferably at 820.degree.-980.degree. C. under oxidizing atmosphere having an oxygen partial pressure of 0.01-0.5 atm.

Yttrium-barrium-copper oxide powder and process for manufacturing

The superconducting structure for magnetic shielding according to the present invention comprises at least two layers of a superconducting layer and a substrate. This superconducting structure for magnetic shielding can be formed in a plate-like shape or a cylindrical shape. When the structure is prepared in three-layers by providing an intermediate layer between the superconducting layer and the substrate, the three-layered structure has improved superconducting properties. When a protective layer is provided on the superconducting layer to protect the layer, the resulting structure has improved thermal shock resistance. The intermediate layer preferably consists of a ceramic or a noble metal and the ceramic preferably consists of a glass.

Superconducting structure for magnetic shielding

The present process for producing a Bi-based superconducting oxide includes the steps of molding a material powder and subjecting the molded article to partial melting and then to crystallization in the presence of oxygen. In that case, the molded article is annealed, after the partial melting, to the crystallization temperature and subjected to crystallization at that temperature. Also, the article after the crystallization is cooled and the cooled article is heat-treated in an inert gas atmosphere. According to the above process, there can be obtained a Bi-based superconducting oxide having excellent superconducting properties.

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Bisai, Japan

Manabu Yoshida