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    MOLDING OF FINE CERAMIC AND MOLDING DEVICE
    4.
    发明专利
    MOLDING OF FINE CERAMIC AND MOLDING DEVICE 失效

    公开(公告)号：JPH03215343A

    公开(公告)日：1991-09-20

    申请号：JP461090

    申请日：1990-01-16

    Applicant: AGENCY IND SCIENCE TECHN ,  TOSHIBA CERAMICS CO ,  TAKEDA CHEMICAL INDUSTRIES LTD

    Inventor： SHIBAZAKI YASUO ,  MIZUTA HIROYUKI ,  OSHIMA KAZUYUKI ,  TAKEUCHI TATSURO

    IPC: C04B35/632 ,  B28B1/26 ,  C04B35/00

    Abstract: PURPOSE:To carry out uniaxial press, to shorten lead time and to reduce cost by kneading fine ceramic powder with a specific plasticity imparting agent to give kneaded soil and press molding the kneaded soil by porous molds. CONSTITUTION:Fine ceramic powder is kneaded with 0.1-10wt.% plasticity imparting agent selected from an organic binder (e.g. paramylon) of polysaccharides produced by microorganisms and a methyl cellulose-based binder and water by Dalton mixer and a vacuum soil kneader to give kneaded soil 1. Then the kneaded soil is set at the center of a porous bottom force 2 made of synthetic resin, provided with a bottom layer with coarse communicating holes having 50-200mum and a molding face layer having

    PRODUCTION OF KAOLINITE WITH LOW CRYSTALLINITY
    5.
    发明专利
    PRODUCTION OF KAOLINITE WITH LOW CRYSTALLINITY 失效

    公开(公告)号：JPH02296714A

    公开(公告)日：1990-12-07

    申请号：JP11840089

    申请日：1989-05-10

    Applicant: AGENCY IND SCIENCE TECHN ,  JINKOU NENDO GOSEI GIJUTSU KEN

    Inventor： SHIBAZAKI YASUO ,  MIYAWAKI RITSURO ,  WATAMURA SHINJI ,  MAEDA MASAKI ,  MIZUTA HIROYUKI ,  YAMASHITA YOSHITAKA

    IPC: C01B33/26

    Abstract: PURPOSE:To produce artificial kaolinite in which plasticity is maintained at high level with superior formation efficiency by carrying out hydrothermal synthesis treatment together with water by using the hydrate of amorphous calcium silicate and the strong acid salt of Al. CONSTITUTION:Hydrothermal synthesis treatment is carried out together with water by using, as raw materials, the hydrate of amorphous calcium silicate and the strong acid salt of Al, such as AlCl3, to obtain kaolinite powder. It is desirable to use, as the hydrate of amorphous calcium silicate, the one having a composition in which the atomic ratio of calcium to silicic acid is regulated to 0.1-2.0. Since the irregular tetrahedron layer of the amorphous Si can be utilized by using the hydrate of amorphous calcium silicate as raw material, kaolinite crystal formation is allowed to occur uniformly and simultaneously over the whole reaction system. Accordingly, sheet-like kaolinite reduced in crystallinity is formed.

    SINTERED MATERIAL OF POLYCRYSTALLINE ALUMINA
    6.
    发明专利
    SINTERED MATERIAL OF POLYCRYSTALLINE ALUMINA 失效

    公开(公告)号：JPH03261648A

    公开(公告)日：1991-11-21

    申请号：JP5664590

    申请日：1990-03-09

    Applicant: AGENCY IND SCIENCE TECHN ,  TOSHIBA CERAMICS CO

    Inventor： SHIBAZAKI YASUO ,  MACHIDA MITSUHIDE ,  MIZUTA HIROYUKI ,  OSHIMA KAZUYUKI ,  FUKAYA TAKAHIRO

    IPC: C04B35/115 ,  C04B35/10

    Abstract: PURPOSE:To make possible to improve light transparency and strength and to form a sintered material of complex shape by controlling averaged crystalline granular diameter in a sintered material to a fixed size in a sintered material of polycrystalline alumina having high light transparency. CONSTITUTION:The subject sintered material of polycrystalline alumina is formed by sintering a molded article of highly purified alumina having controlled averaged crystalline granular diameter of 0.5-20mum. The above mentioned sintered material exhibits high light transparency, namely >=30% linear transmittance although crystalline granular diameter is small. Besides, a sintered material having high strength and complex shape is obtained as crystalline granular diameter is small.

    LITHIUM-CONTAINING KAOLINITE
    7.
    发明专利
    LITHIUM-CONTAINING KAOLINITE 失效

    公开(公告)号：JPH02311311A

    公开(公告)日：1990-12-26

    申请号：JP13366389

    申请日：1989-05-26

    Applicant: AGENCY IND SCIENCE TECHN ,  JINKOU NENDO GOSEI GIJUTSU KEN

    Inventor： MIYAWAKI RITSURO ,  WATAMURA SHINJI ,  MIZUTA HIROYUKI ,  MAEDA MASAKI ,  SHIBAZAKI YASUO ,  MARUYAMA SHINICHI ,  SAMEJIMA SOICHIRO

    IPC: C01B33/26

    Abstract: PURPOSE:To obtain a kaolinite having high plasticity and imparted with crystallinity and particle size similar to those of natural clay by adding Li ion to a mixture of amorphous silica and amorphous alumina and subjecting the mixture to hydrothermal synthesis. CONSTITUTION:An aqueous solution containing 0.05 to 0.5 mol/1 of Li ion is added to a powdery raw material consisting of a mixture of amorphous silica and amorphous alumina and the obtained mixture is subjected to hydrothermal synthesis in a pressure vessel at 150 to 300 deg.C for 1 to 30 days to obtain an Li-containing kaolinite containing lattice defects in the lamination plane, having mitigated strain between a tetrahedral layer and an octahedral layer similar to a kaolinite having ideal chemical composition and having promoted lamination structure.

    ALUMINA PIGMENT FOR COATING COMPOUND
    9.
    发明专利
    ALUMINA PIGMENT FOR COATING COMPOUND 失效

    公开(公告)号：JPH0439362A

    公开(公告)日：1992-02-10

    申请号：JP14611390

    申请日：1990-06-06

    Applicant: AGENCY IND SCIENCE TECHN ,  YOSHIDA KOGYO KK

    Inventor： SHIBAZAKI YASUO ,  MIZUTA HIROYUKI ,  FUKUDA YUSHI

    IPC: C01F7/02 ,  C09C1/40

    Abstract: PURPOSE:To obtain the title pigment showing high dispersibility in coating compounds, forming a coating film having high durability, comprising alumina powder having excellent fastness, fine platy alumina particles having a crystal form of hexagonal system and crystal plane having grown in a flat plate state. CONSTITUTION:The objective pigment comprising fine platy alumina (alpha-Al2O3) particles having a crystal form of hexagonal system and a plane perpendicular to axis C, having grown in a flat plate state.

    HEAT-RESISTANT POROUS CATALYST AND PREPARATION THEREOF
    10.
    发明专利
    HEAT-RESISTANT POROUS CATALYST AND PREPARATION THEREOF 失效

    公开(公告)号：JPS6434447A

    公开(公告)日：1989-02-03

    申请号：JP19031587

    申请日：1987-07-31

    Applicant: AGENCY IND SCIENCE TECHN ,  NICHIBI KK ,  OSAWA TAIKA KK ,  TAIMEI KAGAKU KOGYO KK

    Inventor： SHIBAZAKI YASUO ,  WATAMURA SHINJI ,  MIZUTA HIROYUKI ,  OSAWA TADASHI ,  IZAWA YUICHI ,  MIYAMATSU NORIHISA

    IPC: B01J23/00 ,  B01J23/74 ,  B01J23/755 ,  B01J35/04 ,  B01J37/30

    Abstract: PURPOSE:To extend an effective surface area and to improve heat resistance and physical strength, by bonding an active catalyst component to a carrier in a pore through a spinel-structure layer comprising Al and the metal of the active catalyst component, so as to form a multilayer thereof over the pore surface. CONSTITUTION:An aluminum compound and water are added to ion exchange fibers containing catalytic metal ions, and the resulting mixture is formed into a desired shape and calcined at a temperature not lower than 1,000 deg.C, thereby preparing a heat-resistant porous catalyst. This heat-resistant porous catalyst 1 comprises alpha-alumina as a carrier and a metal or its oxide as an active catalyst component. At least in a pore 4, the active catalyst component is so bonded to the carrier, through a spinel-structure layer 2 comprising aluminum and the metal of the active catalyst component, as to form a multilayer thereof over the pore surface.

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