Other

The Research Institute for Iron, Steel and Other Metals of the Tohoku

Alps Electric Co., Ltd.

Sumitomo Metal Mining Company, Ltd.

Nippon Oil Company

Kabushiki Kaisha Riken

Sumitomo Electric Industries, Limited

Ngk Insulators, Inc.

Daikin Industries, Ltd.

Research Development Corporation of Japan

National Aerospace Laboratories of Science & Technology Agency

Japan As Represented by the Director-general National, Aerospace

Japan As Represented by Director-general, National Aerospace Laboratory

Toshio Hirai

Koichi Niihara

Yoshihiro Someno

Makoto Sasaki

Masayuki Niino

Mamoru Omori

Hisanori Yamane

Seiichi Uemura

Yoshio Sohda

Yasuji Ido

Takashi Goto

Nobuhito Kuroishi

Tetsuo Uchiyama

Atsushi Nakahira

Takefumi Kohno

Hideyuki Kurosawa

Ryuzo Watanabe

Akio Suzuki

Masao Tokita

Yukinori Kude

Tohru Hirano

Tsutomu Yamashita

Shinsuke Hayashi

Toshihiro Kikuchi

Hiroshi Mizuseki

Xinrong Wang

Hiroshi Masumoto

Koichi Nihara

Akira Ohkubo

Yoshiyuki Kawazoe

Sigeo Inoue

A method for advantageously producing sintered eutectic ceramics having a homogenous and dense structure, in particular, a eutectic containing a rare earth aluminate compound. The method allows eutectic powder of alumina and a rare earth aluminate compound to stand at a temperature of 1300-1700&deg; C. for 1-120 minutes under vacuum or in an non-oxidative atmosphere under a pressure of 5-100 MPa using a spark plasma sintering apparatus, thereby causing crystal growth to occur to obtain a rare earth aluminate eutectic structure crystal.

Method for preparing eutectic ceramics

A method of producing multilayered optical filters by using a genetic algorithm that determines an optimal combination of refractive indexes and thicknesses for each layer of the filter is described. The method generates initial values for the component and places the values within a matrix P, where P&equals;(X , X , X , . . . , Xi, . . . , Xs) and Xi is an elementary matrix that includes the refractive index and thickness of each layer i. The method may generate mutated patterns by increasing or decreasing the thicknesses and refractive indexes of the initial pattern. It may also perform a cross-over process, selecting patterns from grouping of mutated patterns. Alternately, the method may perform a process where selected patterns having optical characteristics closest to the desired characteristics from the initial, mutated or crossover patters are chosen. The genetic algorithm utilizing the above processes repeats until the optical characteristics fall within the desired range.

Method for producing multilayered optical filters using a genetic algorithm and a method for operating the genetic algorithm

Described herein is an optical multilayered-film filter which provides less interference and a good optical characteristic and is high in productivity. The optical multilayered-film filter wherein dielectric thin films are stacked on each other in a multilayer form in a single direction, comprises a refractive-index inclined laminated portion in which refractive indices of dielectric thin-film layers are successively inclined and changed in a laminating direction, and an alternately-laminated portion in which a dielectric thin-film layer having a high refractive index and a dielectric thin-film layer having a low refractive index are alternately laminated on each other.

Optical multilayered-film filter

Mixed oxide composite ceramics and method of producing the same

A crystalline sialon comprising crystals containing aluminum, silicon, nitrogen and oxygen, in which the crystal structure has a hexagonal system wurtzite structure identical with that of AlN crystals, and the volume of the unit cell thereof has a value smaller than that of the AlN crystals. The crystalline sialon can be synthesized by mixing a silicon-containing gas, an aluminum halide, a nitrogen atom-containing gas and an oxygen atom-containing gas, converting the gas mixture into plasmas by microwave discharging and depositing a film on the surface of a substrate, in which the temperature of the substrate, while controlling a flow rate of the silicon-containing gas and a flow rate of the oxygen-containing gas. The crystalline sialon of the present invention has high hardness, is excellent in oxidation resistance, as well as excellent in heat conductivity and adhesion with a superhard substrate.

Crystalline sialon having wurtzite structure

Rare earth oxide-alumina-silica sintered body and method of producing

An Si.sub.3 N.sub.4 -Al.sub.2 O.sub.3 composite sintered body suitable for use in high-temperature structural materials consists of .alpha.-Al.sub.2 O.sub.3 and at least one crystal phase of Si.sub.3 N.sub.4 and sialon and is produced by sintering a shaped body of a particular Si.sub.3 N.sub.4 -Al.sub.2 O.sub.3 mixed powder at 1,500.degree.-1,900.degree. C.

Si.sub.3 N.sub.4 -A1.sub.2 O.sub.3 composite sintered bodies and method

A manufacturing method of a forming die includes the steps of depositing a film of aluminum nitride or aluminum oxynitride on the forming surface of a forming member by passing an electric discharge through a mixture gas of halide of aluminum and a gas containing nitrogen atoms and hydrogen atoms or a mixture gas of halide of aluminum, a gas containing nitrogen atoms and a gas containing oxygen atoms by the application of a microwave and thereby ionizing the mixture gas, and fixing such a forming member on a die.

Forming die manufacturing method

A chemical vapor deposition method is disclosed for forming a dense and transparent or semitransparent zirconia film on a substrate which has substantially one or two kinds of particular planes such as (200), (111) or (111) planes only oriented in parallel to the surface of the substrate.

Chemical vapor deposition of dense and transparent zirconia films

A carbon material having oxidation resistance is prepared by forming a fi coating constituted mainly by carbon on the surface of a carbon/carbon composite by chemical vapor deposition, then forming on said first coating a second coating of a ceramic or both a ceramic and carbon by chemical vapor deposition, and changing at least one of thermal physical properties or mechanical physical properties of carbon in said first coating continuously or step-wise.

Process for preparing carbon material

A method of synthesizing metal-containing material by a plasma chemical vapor deposition comprises converting a reactive gas containing metal atoms into plasmas in a reaction chamber and supplying an inert gas from outside the plasma region in the reaction chamber. Ceramic films of excellent quality can be synthesized under stable conditions in an industrial mass production process.

Synthesis method by plasma chemical vapor deposition

A carbon/carbon composite having oxidation resistance is produced by filling the voids of a carbon/carbon composite comprising 10-70% by volume of carbon fibers and 5-90% by volume of a carbonaceous matrix and having a void percentage of 10-55%, with at least one of carbon and a ceramic by chemical vapor infiltration and then coating the deposit surface with a ceramic or both ceramic and carbon by chemical vapor deposition.

Process for producing carbon/carbon composite having oxidation resistance

A method of manufacturing Josephson junctions includes steps of high Tc superconductor thin films on a substrates by chemical vapor deposition using raw materials, which includes at least yttrium, barium and copper, serving as vapor generating sources, and fabricating the high Tc superconductor thin films into micro-bridges to produce Josephson junctions.

Method of manufacturing josephson junctions

A zirconia film formed on a substrate and having substantially one or two kinds of particular planes such as (200), (111) or (111) planes only oriented in parallel to the surface of the substrate, and a process for preparing it. This zirconia film is dense, and improved in the thermal resistance, thermal insulation properties and corrosion resistance.

Zirconia film and process for preparing it

The present invention relates to a method of producing a functionally grant material whose components and structure are continuously adjusted by the coating, plating and powder metallurgy techniques to change its function in turn and provide a method of producing a functionally gradient material superior in heat-resistance, corrosion-resistance and resistance to thermal fatigue by distributing a third component having a lower Young's modulus or formed of high-strength material sufficiently durable to the fracture strength among ceramics as a first component and metals or other ceramics as a second component to change the function.

Method of producing a functionally gradient material

Growing community of inventors

Sendai, Japan

Toshio Hirai