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    METHOD FOR PRODUCING SIALON SINTERED COMPACT
    2.
    发明专利
    METHOD FOR PRODUCING SIALON SINTERED COMPACT 失效

    公开(公告)号：JP2001261447A

    公开(公告)日：2001-09-26

    申请号：JP2000081828

    申请日：2000-03-17

    Applicant: NAT INST FOR MATERIALS SCIENCE

    Inventor： MITOMO MAMORU ,  O SHOMEI ,  HIROSAKI NAOTO

    IPC: C04B35/599

    Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a sialon sintered compact which is constituted of only β-sialon and a glass phase present at grain boundary besides α-sialon being stabilized with Ce and is high in hardness and excellent in wear resistance. SOLUTION: A high hardness sialon sintered compact containing Ce-α-sialon and having hardness of >=170 GPa is produced by adding 0.2 to 30 wt.% α-sialon powder previously produced to a mixed powder of Si3N4-AlN-Al2O3-CeO2-system in which Si3N4:AlN:Al2O3:CeO2 is 3 to/2:4 to 6:0 to 0.5:1 in molar ratios and sintering by various sintering methods such as a plasma sintering, a hot pressing, a normal sintering and a gas-pressure sintering method.

    SILICON NITRIDE SINTERED COMPACT AND METHOD FOR MANUFACTURING THE SAME
    4.
    发明专利
    SILICON NITRIDE SINTERED COMPACT AND METHOD FOR MANUFACTURING THE SAME 失效

    公开(公告)号：JP2002068843A

    公开(公告)日：2002-03-08

    申请号：JP2000258568

    申请日：2000-08-29

    Applicant: NAT INST FOR MATERIALS SCIENCE

    Inventor： HIROSAKI NAOTO ,  NISHIMURA SATOYUKI ,  YAMAMOTO YOSHINOBU ,  MITOMO MAMORU

    IPC: C04B35/584

    Abstract: PROBLEM TO BE SOLVED: To provide a silicon nitride sintered compact having both of high strength and superior antioxidation property at high temperature. SOLUTION: In the sintered compact, the intergranular phase consists of a substantially single phase of Lu4Si2O7N2 crystal phase. The composition of the sintered compact represented in the Si3N4-SiO2-Lu2O3 ternary constitution diagram corresponds to the boundary or inside of triangle ABC having three points of point A: Si3N4, point B: 28 mol% SiO2-72 mol% Lu2O3 and point C: 16 mol% SiO2-84 mol% Lu2O3 as vertexes.

    CERIUM ION ACTIVATED-LANTHANUM SILICON NITRIDE FLUORESCENT SUBSTANCE
    6.
    发明专利
    CERIUM ION ACTIVATED-LANTHANUM SILICON NITRIDE FLUORESCENT SUBSTANCE 审中-公开

    公开(公告)号：JP2003096446A

    公开(公告)日：2003-04-03

    申请号：JP2001288156

    申请日：2001-09-21

    Applicant: NAT INST FOR MATERIALS SCIENCE

    Inventor： MITOMO MAMORU ,  ENDO TADASHI ,  UEDA KYOTA

    IPC: C09K11/79

    Abstract: PROBLEM TO BE SOLVED: To provide a cerium ion activated-lanthanum silicon nitride fluorescent substance satisfying chromaticity of blue color, excellent in thermal stability, mechanical properties and chemical stability and usable in severe circumstances, applicable to VFD (Vacuum Fluorescent Display) and FED (Field Emission Display). SOLUTION: This fluorescent substance is expressed by general formula La1-x Si3 N5 :xCe (x is a amount of activation, 0; x; 1), a part of the lanthanum ion is activated by substituting and forming a solid solution of the cerium ion.

    ACID NITRIDE PHOSPHOR ACTIVATED WITH RARE EARTH ELEMENT
    7.
    发明专利
    ACID NITRIDE PHOSPHOR ACTIVATED WITH RARE EARTH ELEMENT 失效

    公开(公告)号：JP2002363554A

    公开(公告)日：2002-12-18

    申请号：JP2001171831

    申请日：2001-06-07

    Applicant: NAT INST FOR MATERIALS SCIENCE

    Inventor： MITOMO MAMORU ,  ENDO TADASHI ,  UEDA KYOTA

    IPC: C04B35/599 ,  C09K11/64 ,  C09K11/80

    Abstract: PROBLEM TO BE SOLVED: To provide an acid nitride phosphor activated with a rare earth element, which can realize a white LED with a higher luminance, using a blue LED as the light source. SOLUTION: This phosphor is represented by the general formula: Mex Si12-(m+n) Al(m+n) On N16-n :Re1y Re2z , wherein a part or the whole of the metal(s) Me (Me is Ca, Mg, Y, or one or more of lanthanide metals except La and Ce) capable of forming a solid solution with α-sialon is substituted by lanthanide metal(s) Re1 (Re1 is one or more of Ce, Pr, Eu, Tb, Yb, and Er) serving as a luminescent center, or two kinds of lanthanide metals Re1 and a coactivator comprising Re2 (Re2 is Dy).

    SILICON NITRIDE SINTERED COMPACT AND ITS MANUFACTURING MRTHOD
    9.
    发明专利
    SILICON NITRIDE SINTERED COMPACT AND ITS MANUFACTURING MRTHOD 失效

    公开(公告)号：JP2002137968A

    公开(公告)日：2002-05-14

    申请号：JP2000324327

    申请日：2000-10-24

    Applicant: NAT INST FOR MATERIALS SCIENCE

    Inventor： HIROSAKI NAOTO ,  NISHIMURA SATOYUKI ,  YAMAMOTO YOSHINOBU ,  MITOMO MAMORU

    IPC: C04B35/584

    Abstract: PROBLEM TO BE SOLVED: To provide a material excellent in creep-resistant property by crystallizing assistant having a high fusing point on grain boundary efficiently, with only an ordinary sintering process dispensing with specific heat treatment. SOLUTION: The silicon nitride sintered compact is characterized in that the sintered compact composed of a grain boundary phase of silicon nitride grain and acid nitride grain, the composition of which is shown on the ternary system constitutional diagram of Si3N4-SiO2-Lu2O3, in a triangle constituted of three points, a point A: Si3N4, a point B: 40 mol% SiO2-60 mol%-Lu2O3, a point C: 60 mol% SiO2-40 mol%-Lu2O3.

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