Ube Industries, Inc.

Kabushiki Kaisha Toyota Chuo Kenkyusho

Toshihiro Ishikawa

Masaki Shibuya

Takemi Yamamura

Mitsuhiko Sato

Kiyohito Okamura

Hiroyuki Yamaoka

Shinji Kajii

Yoshikatu Harada

Makoto Tamura

Yoshiyuki Inoue

Junichi Kugimoto

Yoshiharu Waku

Toshihiko Hogami

Kenji Matsunaga

Hajime Ikuno

Shinichi Towata

Yoshikatsu Harada

Senichi Yamada

Hidekuni Hayashi

Yasuhiro Sioji

A silica-group composite oxide fiber formed of a composite oxide phase of an oxide phase (first phase) mainly made of a silica component and a metal oxide phase (second phase) excluding silica, in which the existent ratio of at least one metal element of a metal oxide constituting the second phase upward slopingly increases toward the surface layer of the fiber and a process for the production thereof.

Silica-group composite oxide fiber and process for the production thereof

A highly heat-resistant sintered SiC fiber bonded material free of a decrease in strength and less breakable at an ultra-high temperature over 1,400.degree. C., comprising inorganic fibers which are composed mainly of a sintered SiC crystal, contain at least one kind of metal atoms selected from the class consisting of metal atoms of the 2A, 3A and 3B groups of the periodic table and are bonded nearly in the close-packed structure and 1 to 50 nm boundary layers composed mainly of carbon which are present at the interface of fibers, the less breakable highly heat-resistant sintered SiC fiber-bonded material having a density of at least 2.7 g/cm.sup.3 and an elastic modulus of at least 200 GPa, and a process for the production thereof.

Sintered SIC fibers bonded material

A silicon-carbide-based inorganic fiber not only excellent in mechanical properties but also excellent in alkali durability and heat resistance, containing at least 0.1% by weight of a metal atom which is at least one member selected from the group consisting of metals belonging to Groups 2A, 3A and 3B of the periodic table and whose oxide exhibits amphoterism or basicity, having an oxygen content of 17% by weight or less, having an atomic ratio of carbon to silicon (C/Si) in the range of from 1 to 1.7, and having a density of less than 2.7 g/cm.sup.3.

Silicon-carbide-based inorganic fiber

A crystalline silicon carbide fiber excellent not only in mechanical properties but also in alkali durability at high temperatures, which has a density of at least 2.7 g/cm.sup.3, contains 55 to 70% by weight of Si, 30 to 45% by weight of C, 0.06 to 3.8% by weight of Al and 0.06 to 0.5% by weight of B, the total of these elements being 100% by weight, and has a sintered structure of SiC.

Silicon carbide fiber having excellent alkali durability

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

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

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Ube, Japan

Toshihiro Ishikawa