Ube Industries, Inc.

Other

Kabushiki Kaisha Toyota Chuo Kenkyusho

Japan Ultra-high Temperature Materials Research Center

Takemi Yamamura

Kiyohito Okamura

Masaki Shibuya

Yoshio Hasegawa

Toshihiro Ishikawa

Seishi Yajima

Masahiro Tokuse

Yoshiharu Waku

Teruhisa Furushima

Mitsuhiko Sato

Makoto Tamura

Junichi Kugimoto

Hajime Ikuno

Hideki Ohtsubo

Shinichi Towata

Narihito Nakagawa

Senichi Yamada

Terumi Hisayuki

Motohide Toda

Tooru Hiratuka

Yasuhiro Sioji

Hironaga Iguchi

Shunsuke Nakatomi

Yoshikazu Akiba

Yoshikazu Matsumura

Tetsurou Hirokawa

Akiko Noda

Shouju Masaki

Mantaro Yajima

Takeshi Tanamura

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 fiber-bond type ceramic material,is produced by using as raw material fibers,inorganic fibers of Si&mdash;M&mdash;C&mdash;O synthesized by melt spinning polycarbosilane, then infusibilizing the produced threads, and firing the set threads, forming from the raw material fibers a woven fabric,having all the fibers thereof extended perpendicularly or obliquely relative to the direction of compression during the course of a hot-press fabrication at a weaving step,, heat-treating the woven fabric in the air, thereby preparing a woven fabric of oxidized fibers,provided with an oxide layer on the surface thereof at an oxidizing step,, and subjecting the woven fabric of oxidized fibers to a hot-press fabrication while compressing the fabric in the direction of the compression thereby causing the oxide layers on the surface to adhere fast to each other and form a matrix at a hot-press step

Method for production of fiber-bond type ceramic material and engine parts formed thereof

An inorganic fiber sinter consists essentially of (a) an inorganic substance (I) selected from the group consisting of (i) an amorphous substance consisting essentially of Si, M, C and O, (ii) an agglomerate consisting essentially of crystalline ultrafine particles of .beta.-SiC, MC, a solid solution of .beta.-SiC with MC and/or MC.sub.1-x, and amorphous SiO.sub.2 and MO.sub.2, and (iii) a mixture of the above amorphous substance (i) and the agglomerate (ii), and (b) an inorganic substance (II) selected from the group consisting of (iv) an amorphous substance consisting essentially of Si, M and O, (v) a crystal agglomerate consisting essentially of crystalline SiO.sub.2 and MO.sub.2, and (iv) a mixture of the amorphous substance (iv) and the crystal agglomerate (v), wherein M is Ti or Zr and x is a number of more than 0 to less than 1. Due to its high uniformity and high strength, the sinter is used mainly for internal combustion engine parts such as a piston ring and an auxiliary combustion chamber, and rocket engine parts such as a nose cone and a nozzle.

Inorganic fiber sinter and process for producing same

Carbon fibers having high strength and high modulus of elasticity and

An inorganic fiber having excellent properties as a reinforcement for metals, plastics and rubbers, which has a surface layer portion and an inner layer portion, the surface layer portion having a composition continuously changing from the inner layer portion to the fiber surface, and which is composed of a basic constituent unit of;

Inorganic fiber and process for the production thereof

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

This invention provides an electromagnetic wave absorbing material composed of a composite material comprising a fiber having a specific resistance of 10.sup.-2 to 10.sup.2 .OMEGA..cm and a matrix, wherein the fiber is composed of an inorganic substance selected from the group consisting of

Electromagnetic wave absorbing material

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 fiber and fibrous material for producing composite materials, fiber-reinforced metals, fiber-reinforced plastics and fiber-reinforced ceramics, in which short fibers, whiskers or powders made of heat resistant material are deposited on continuous fibers made of heat resistant material. The composite materials, such as fiber-reinforced metals, plastics, and ceramics, contain the fibrous material in a matrix, and have improved control of the fiber volume ratio and mechanical characteristics. Processes for producing the fiber, fibrous materials and composite materials are also disclosed.

Fibrous material for composite materials, fiber-reinforced composite

A reinforcing inorganic fiber composed of an internal layer and a surface layer, wherein

Reinforcing fibers and composite materials reinforced with said fibers

A hybrid fiber-reinforced plastic composite material comprising a matrix of a plastic and hybrid fibers consisting of inorganic fibers and at least one kind of fibers selected from the group consisting of carbon fibers, glass fibers, boron fibers, aramide fibers and silicon carbide fibers having a carbon core, wherein

Hybrid fiber-reinforced plastic composite material

An inorganic fibrous material for reinforcing composite materials, said fibrous material composed of a central layer and a surface layer, wherein

Inorganic fibrous material as reinforcement for composite materials and

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

An inorganic fiber-reinforced metallic composite material comprising a matrix of a metal or its alloy and inorganic fibers as a reinforcing material, characterized in that

Inorganic fiber-reinforced metallic composite material

An inorganic fiber-reinforced ceramic composite material comprising a matrix of a ceramic and inorganic fibers as a reinforcing material, characterized in that (a) the inorganic fibers are specified inorganic fibers containing silicon, either titanium or zirconium, carbon and oxygen, (b) the ceramic is at least one material selected from the group consisting of carbides, nitrides, oxides, glass ceramics, graphite and specified inorganic materials containing silicon, either titanium or zirconium, carbon and oxygen, (c) the inorganic fibers have an initial reaction degradation speed of not more than 0.35 kg/mm.sup.2.sec.sup.-1 and a tenacity reduction ratio of not more than 40% during the production of the composite material, (d) the composite material has a critical stress intensity factor about 2 to 7 times as high as that of said matrix alone, and (e) the composite material has a bending strength reduction ratio, measured by a thermal shock fracture resistance measuring method, of not more than about 10% after it is heat-treated in air at 800.degree. to 1300.degree. C., immediately then dipped in water at room temperature, and then dried.

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Ube, Japan

Takemi Yamamura