Ube Industries, Inc.

The Foundation: the Research Institute for Special Inorganic Materials

Japan Atomic Energy Research Institute

Other

Nippon Carbon Co., Ltd.

Sony Corporation

Ntn Toyo Bearing Co., Ltd.

Japan Science and Technology Corporation

Ube Industires, Ltd.

Japan Ultra-High Temperature Materials Research Center

The Research Institute for the Foundation: Special Inorganic Materials

Kiyohito Okamura

Yoshio Hasegawa

Seishi Yajima

Takemi Yamamura

Toetsu Shishido

Mitsuhiko Sato

Tadao Seguchi

Masaki Sugimoto

Masaki Shibuya

Toshihiro Ishikawa

Shunichi Kawanishi

Noboru Kasai

Masana Ugaji

Yoshiyasu Kuroo

Makoto Tamura

Hiroshi Kobayashi

Hiroshi Ichikawa

Josaburo Hayashi

Hideo Kayano

Masanobu Nishii

Yosuke Morita

Narihito Nakagawa

Akira Kohyama

Yutai Katoh

Terumi Hisayuki

Akira Idesaki

Michio Takeda

Takaaki Dohmaru

Kunio Oka

Takemi Yamaura

Seishi Yajima, Deceased

Masayoshi Itoh

Akiko Noda, Heir

Motohide Toda

Akiko Noda

Mantaro Yajima

Hironaga Iguchi

Yoshikazu Matsumura

Tsuyoshi Mitsuhashi

Masaki Narisawa

Masaki Nishioka

A method for improving thermal efficiency of a heating device that reduces an amount of heat flowing out from a heating deviceto the outside by installing a heat-resistant inorganic conjugated molded productin and along a pathwayfor heated gas generated from the heating devicewithout interrupting the flow of heated gas passing the pathway, heating the inorganic conjugated molded productwith the heated gas, and putting radiation heat from the heated inorganic conjugated molded productback into the heating device, the inorganic conjugated molded productbeing provided with an interior layer and an exterior layer, the exterior layer consisting of a coverture for inorganic materials that protects the interior layer from heated gas.

Method and apparatus for improving thermal efficiency of heating device

A mixed polymer liquid is prepared by mixing a polycarbosilane-dissolved organic solvent with poly(methylsilane) and moderated to viscosity of 5&#x2013;20 Pa&#xb7;s by heat-treatment to promote partial cross-linking reaction. The mixed-polymer is then melt-spun to fiber at 250&#x2013;350&#xb0; C. The fiber is cured by treatment at 100&#x2013;200&#xb0; C. in an oxidizing atmosphere, and baked at 1000&#xb0; C. or higher. Due to thermosetting action of poly(methylsilane), the mixed polymer liquid is continuously melt-spun without breakage, and SiC fiber produced in this way is useful for reinforcement of SiC composite excellent in toughness, strength and heat-resistance.

Process for producing reinforcing SiC fiber for SiC composite material

A process for producing a SiC ceramic microtube by oxidizing the surface of an organosilicon polymer to become infusible by exposure to an ionizing radiation, extracting the uncrosslinked central portion of the fiber with an organic solvent to make a hollow silicon polymer fiber, and firing it in an inert gas so that it acquires a ceramic nature.

Process for producing microceramic tubes by radiation exposure of silicon-based polymers

Polycarbosilane is mixed with 5-35 wt % of polyvinylsilane to prepare a silicon-base polymer blend which is impregnated in silicon carbide fibers or fabrics to form a preceramic molding body which is exposed to an ionizing radiation to be rendered curing and then fired in an inert gas to produce a composite in which the silicon carbide matrix is reinforced with the silicon carbide fibers.

Process for producing silicon carbide composites from silicon-based polymers by radiation application

Ultra-high-strength refractory silicon carbide fiber having a decomposition temperature of not less than about 1800K, a breaking strength of not less than about 5 GPa, and a modulus of elasticity of not less than about 300 GPa is disclosed, which is obtained by irradiating a precursor comprising organosilicon compound fiber with an ionizing radiation in a mixed carrier gas comprising a reactive gas and a first inert gas to render the precursor infusible and calcining the irradiated precursor in a second inert gas. Irradiation damage can be minimized, and no oxygen is incorporated into the fiber.

Ultra-high-strength refractory silicon carbide fiber and process for

A super heat-resistant silicon carbide fiber has an oxygen content of less than 0.1% by weight. In a process for producing the super heat-resistant silicon carbide fiber, a precursor fiber prepared by spinning a polycarbosilane having an oxygen content of less than 0.8% by weight is irradiated with a radiation in an oxygen-free atmosphere or in vacuo to make the precursor fiber infusible. The infusibilized fiber is fired in an oxygen-free atmosphere or in vacuo at a temperature of from 1000.degree. to 2200.degree. C. without exposure to an oxidizing atmosphere; or stabilized in the same atmosphere at a temperature of from 300.degree. to 600.degree. C. without exposure to an oxidizing atmosphere and fired in an oxygen-free atmosphere or in vacuo at a temperature of from 1000.degree. to 2200.degree. C.

Super heat-resistant silicon carbide fibers from poly-carbosilane

The high-strength and high-toughness sinter of the present invention includes a crystal agglomerate maintaining a fibrous shape and composed of crystals of SiC and MC.sub.1-x wherein M is Ti and/or Zr and x is a number of 0 or more but less than 1. This sinter is produced by laminating an inorganic fiber of a particular inorganic material containing titanium and/or zirconium molding the laminate into a predetermined shape, and conducting heat-sintering simultaneously with the molding or after the molding in an atmosphere of a vacuum, an inert gas, a reducing gas, or a hydrocarbon gas at a temperature of 1,700 to 2,200.degree. C.

Process for producing a high strength and high toughness sinter

A high purity and high strength inorganic silicon nitride continuous fiber substantially composed of Si and N with excellent properties can be provided. A method of producing the fiber is also disclosed.

High purity and high strength inorganic silicon nitride continuous fiber

The high-strength and high-toughness sinter of the present invention comprises a crystal agglomerate maintaining a fibrous shape and composed of crystals of SiC and MC.sub.1-x wherein M is Ti and/or Zr and X is a number of 0 or more but less than 1. This sinter is produced by laminating an inorganic fiber comprising a particular inorganic material containing titanium and/or zirconium molding the laminate into a predetermined shape, and conducting heat-sintering simultaneously with the molding or after the molding in an atmosphere comprising at least one member selected from the group consisting of a vacuum, an inert gas, a reducing gas, and a hydrucoarbon gas at a temperature of 1,700.degree. to 2,200.degree. C.

High-strength and high-toughness sinter and process for producing the

A continuous inorganic fiber consisting of Si, N and O has excellent physical, chemical and electrically insulating properties, is superior to carbon fiber in wettability with metal, is low in reactivity with metal, and can be used not only as a reinforcing fiber for fiber-reinforcing type metals and fiber-reinforcing type ceramics, but also in electrical insulating materials and in heat-resistant materials.

Method of producing continuous inorganic fiber consisting of Si, N and O

Organopolyarylsilanes, process for manufacturing the same and fibers

Silicon carbide-carbon composite molded product and process for

Continuous inorganic fibers consisting substantially of Si, Zr and C and optionally of O, said fibers being composed of (1) an amorphous material consisting substantially of Si, Zr and C and optionally of O, or (2) an aggregate consisting substantially of ultrafine crystalline particles of .beta.-SiC, ZrC, a solid solution of .beta.-SiC and ZrC and ZrC.sub.1-x wherein O&lt;x&lt;1 and having a particle diameter of not more than 500 .ANG., in which amorphous SiO.sub.2 and ZrO.sub.2 sometimes exist in the neighborhood of these ultrafine crystalline particles, or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles. The aforesaid continuous inorganic fibers can be produced by the following steps: a first step of preparing a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton composed mainly of carbosilane units of the formula --Si--CH.sub.2 --, each silicon atom of said carbosilane units having bonded thereto a side-chain group selected from the class consisting of hydrogen, lower alkyl and phenyl, and zirconoxane units of the formula --Sr-O--; a second step of preparing a spinning dope of said semi-inorganic block copolymer and spinning the dope; a third step of subjecting the resulting fibers to a treatment of rendering them infusible under tension or under no tension; and a fourth step of firing the infusible fibers at a temperature of 800.degree. to 1800.degree. C. in a vacuum or in an atmosphere of an inert gas or a reducing gas.

Continuous inorganic fibers and process for production thereof

Continuous inorganic fiber consisting of Si, N and O and a method of

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Oharai, Japan

Kiyohito Okamura