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    1.
    发明专利
    未知

    公开(公告)号：DE69208753D1

    公开(公告)日：1996-04-11

    申请号：DE69208753

    申请日：1992-07-08

    Applicant: AGENCY IND SCIENCE TECHN ,  YKK CORP

    Inventor： SHIBASAKI YASUO ,  ODA KIICHI ,  FUKUDA TAKESHI

    IPC: C01F7/02 ,  C01F7/44 ,  C08K7/00 ,  C09C1/40 ,  C09D7/12

    Abstract: The present invention provides a process for producing fine flaky alumina particles suitable as a raw material for ceramics, a pigment for paint and etc., wherein aluminum hydroxide or alumina hydrate having a particle size regulated to the order of submicron is subjected to a hydrothermal treatment in water or an aqueous alkali solution at a temperature of 350 DEG C or above under a pressure of 200 kg/cm or below. The present invention further provides an alumina-based plastic material which is produced by kneading the aforesaid fine flaky particles with an organic water holding material and water. Methylcellulose, polyvinyl alcohol, carboxymethylcellulose, polyethylene glycol, etc. are preferably used as the organic water holding agent. The alumina-based plastic material has a high plasticity, so that there is no need of using a large amount of a binder. Thus a dense molded article having stable properties can be prepared.

    3.
    发明专利
    未知

    公开(公告)号：DE69208753T2

    公开(公告)日：1996-09-26

    申请号：DE69208753

    申请日：1992-07-08

    Applicant: AGENCY IND SCIENCE TECHN ,  YKK CORP

    Inventor： SHIBASAKI YASUO ,  ODA KIICHI ,  FUKUDA TAKESHI

    IPC: C01F7/02 ,  C01F7/44 ,  C08K7/00 ,  C09C1/40 ,  C09D7/12

    Abstract: The present invention provides a process for producing fine flaky alumina particles suitable as a raw material for ceramics, a pigment for paint and etc., wherein aluminum hydroxide or alumina hydrate having a particle size regulated to the order of submicron is subjected to a hydrothermal treatment in water or an aqueous alkali solution at a temperature of 350 DEG C or above under a pressure of 200 kg/cm or below. The present invention further provides an alumina-based plastic material which is produced by kneading the aforesaid fine flaky particles with an organic water holding material and water. Methylcellulose, polyvinyl alcohol, carboxymethylcellulose, polyethylene glycol, etc. are preferably used as the organic water holding agent. The alumina-based plastic material has a high plasticity, so that there is no need of using a large amount of a binder. Thus a dense molded article having stable properties can be prepared.

    PROCESS FOR PRODUCING FINE FLAKY ALUMINA PARTICLES AND ALUMINA-BASED PLASTIC MATERIAL
    4.
    发明专利
    PROCESS FOR PRODUCING FINE FLAKY ALUMINA PARTICLES AND ALUMINA-BASED PLASTIC MATERIAL 未知

    公开(公告)号：CA2073471C

    公开(公告)日：1998-05-19

    申请号：CA2073471

    申请日：1992-07-08

    Applicant: AGENCY IND SCIENCE TECHN ,  YKK CORP

    Inventor： FUKUDA TAKESHI ,  ODA KIICHI ,  SHIBASAKI YASUO

    IPC: C01F7/02 ,  C01F7/44 ,  C08K7/00 ,  C08L101/00 ,  C08L1/08

    Abstract: The present invention provides a process for producing fine flaky alumina particles which are suitable as a raw material for ceramics, a pigment for paint and etc., wherein aluminum hydroxide or alumina hydrate having a particle size regulated to the order of submicron is subjected to a hydrothermal treatment in water or an aqueous alkali solution at a temperature of 350.degree.C or above and under a pressure of 200 kg/cm2 or below. The present invention further provides an alumina-based plastic material which is produced by kneading the aforesaid fine flaky particles with an organic water holding material and water. Methylcellulose, polyvinyl alcohol, carboxymethylcellulose, polyethylene glycol, etc. are preferably used as the organic water holding agent. The alumina-based plastic material has a high plasticity, so that there is no need of using a large amount of a binder. Thus a dense molded article having stable properties can be prepared.

    PROCESS FOR PRODUCING FINE FLAKY ALUMINA PARTICLES AND ALUMINA-BASED PLASTIC MATERIAL
    7.
    发明专利
    PROCESS FOR PRODUCING FINE FLAKY ALUMINA PARTICLES AND ALUMINA-BASED PLASTIC MATERIAL 未知

    公开(公告)号：CA2073471A1

    公开(公告)日：1993-01-10

    申请号：CA2073471

    申请日：1992-07-08

    Applicant: AGENCY IND SCIENCE TECHN ,  YOSHIDA KOGYO KK

    Inventor： SHIBASAKI YASUO ,  ODA KIICHI ,  FUKUDA TAKESHI

    IPC: C01F7/02 ,  C01F7/44 ,  C08K7/00 ,  C08L101/00 ,  C08L1/08

    Abstract: The present invention provides a process for producing fine flaky alumina particles suitable as a raw material for ceramics, a pigment for paint and etc., wherein aluminum hydroxide or alumina hydrate having a particle size regulated to the order of submicron is subjected to a hydrothermal treatment in water or an aqueous alkali solution at a temperature of 350 DEG C or above under a pressure of 200 kg/cm or below. The present invention further provides an alumina-based plastic material which is produced by kneading the aforesaid fine flaky particles with an organic water holding material and water. Methylcellulose, polyvinyl alcohol, carboxymethylcellulose, polyethylene glycol, etc. are preferably used as the organic water holding agent. The alumina-based plastic material has a high plasticity, so that there is no need of using a large amount of a binder. Thus a dense molded article having stable properties can be prepared.

    METHOD FOR MEASURING PLASTICITY OF KNEADED EARTH
    8.
    发明专利
    METHOD FOR MEASURING PLASTICITY OF KNEADED EARTH 失效

    公开(公告)号：JPH1194725A

    公开(公告)日：1999-04-09

    申请号：JP26817797

    申请日：1997-09-12

    Applicant: AGENCY IND SCIENCE TECHN ,  CERAMICS SUIKA SOSEIKEI GIJUTS

    Inventor： SHIBAZAKI YASUO ,  ODA KIICHI ,  SANO SABURO ,  TOMONO TAKUMI ,  OGURI KENTA ,  KAWAI HIDEJI ,  NOMURA YUJI ,  ONO AKIRA

    IPC: G01N11/00 ,  G01N11/04 ,  G01N11/08 ,  G01N33/24

    Abstract: PROBLEM TO BE SOLVED: To correctly measure plasticity of kneaded earth by adding pressure by a piston to the elastic body stored in a cylinder chamber, extruding the kneaded earth through a capillary, and obtaining a shear stress and a shear velocity from an extrusion pressure at the time, etc. SOLUTION: A kneaded earth 18 as a sample is pressed into a cylinder chamber 10. A piston 16 is pressed to extrude the kneaded earth 18 from a capillary 14. An extrusion pressure is measured by a pressure sensor 20. A shear stress and a shear velocity are obtained from the measured extrusion pressure, an extrusion speed and a size of the capillary 14. At this time, a pressure loss of the extrusion pressure applied by the piston 16 into the capillary 14 through the cylinder chamber 10 is corrected with a length of the capillary, so that a true shear stress is obtained. The true shear stress is obtained under various shear velocities, and a relationship of the shear velocity and shear stress is induced. A fluidity and a shape retention of the plastic body 18 are obtained from the relationship of the shear velocity and shear stress, and whether the kneaded earth has good plasticity or not is judged.

    SOLID ELECTROLYTE FUEL CELL AND MANUFACTURE THEREOF
    9.
    发明专利
    SOLID ELECTROLYTE FUEL CELL AND MANUFACTURE THEREOF 失效

    公开(公告)号：JPH07307159A

    公开(公告)日：1995-11-21

    申请号：JP26443093

    申请日：1993-10-22

    Applicant: AGENCY IND SCIENCE TECHN ,  FUJI ELECTRIC CO LTD

    Inventor： ODA KIICHI ,  SHIBAZAKI YASUO ,  SHIMIZU KAZUSHI ,  YOSHIDA SHIZUYASU

    IPC: H01M8/02 ,  H01M8/12

    Abstract: PURPOSE:To provide a two layer aggregate with no warp and no break by arranging an electrode plate made of a porous body formed by sintering ceramic coarse powder through binder fine powder and a solid electrolyte body made of a dense body formed by sintering zirconia solid electrolyte coarse powder through zirconia solid electrolyte fine powder. CONSTITUTION:A 100-200um thick dense solid electrolyte body 2 made of zirconia is formed on the plane surface of a 3mm thick anode plate 1. A groove 5 is formed on the gas supply side of the anode plate 1. Each component of a two layer aggregate of the solid electrolyte body/the anode plate is produced in the following way. The anode plate 1 is a porous body and produced by sintering the coarse powder of a porous ceramic comprising zirconia, alkali earth element- or rare earth element-doped lanthanum manganite, lanthanum nickelite, lanthanum cobaltite, lanthanum chromite, or a mixture of them through fine powder of a sintering agent (such as silica and alumina). The solid electrolyte body 2 is a dense body and produced by sintering the coarse powder of a zirconia solid electrolyte through the fine powder of the zirconia solid electrolyte.

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