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    SUPERCONDUCTING SINGLE CRYSTAL AND ITS PRODUCTION
    2.
    发明专利
    SUPERCONDUCTING SINGLE CRYSTAL AND ITS PRODUCTION 失效

    公开(公告)号：JPH0465396A

    公开(公告)日：1992-03-02

    申请号：JP17712490

    申请日：1990-07-03

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  TANIGAWA HIDEO ,  OGURA TORU ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU ,  KAWAI TOMOJI

    IPC: C01G29/00 ,  C01G1/00 ,  C30B1/02 ,  C30B29/22 ,  C30B33/02 ,  H01L39/12

    Abstract: PURPOSE:To raise the critical temp. above the temp. of liq. oxygen by embedding a single crystal having a Bi2Sr2CaCu2O8 structure(2212 phase) in a specified oxide powder and heat-treating the powder. CONSTITUTION:The raw materials are mixed so that Bi=1.00, Sr=0.5-1.5, Ca=1.0-3.0, Cu=1.0-5.0 and Pb=0.2-1.0 in the atomic compositional ratio, and the mixture is sintered at 800-860 deg.C for 5-100 hr in an oxygen atmosphere and then pulverized to obtain an oxide powder. A single crystal consisting of Bi, Sr, Ca, Cu and O and having a Bi2Sr2CaCu3O8 structure(2212 phase) or a single crystal consisting of Bi, Sr, Cu and O and having a Bi2Sr2Cu1O6 structure (2201 phase) is then embedded in the oxide powder, and the powder is heat-treated at 830-860 deg.C for 50-200 hr to obtain a superconducting single crystal with the atomic compositional ratio expressed by the formula (0

    HOT ISOSTATIC PRESS SINTERING METHOD
    3.
    发明专利
    HOT ISOSTATIC PRESS SINTERING METHOD 失效

    公开(公告)号：JPH01305868A

    公开(公告)日：1989-12-11

    申请号：JP13582388

    申请日：1988-05-31

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： KONDO ISAO ,  TAMATOSHI NOBUYUKI ,  KINOSHITA MINORU

    IPC: C04B35/645 ,  B22F3/14 ,  B22F3/15 ,  C04B35/64

    Abstract: PURPOSE:To simplify working stages, to reduce the cost of production of a sintered body and to improve productivity by putting a material to be sintered in a glass vessel, heating this vessel in vacuum in a hot isostatic press sintering furnace to coat the material with the softened glass and carrying out hot isostatic press sintering in the furnace. CONSTITUTION:A material 1 to be sintered is put in a glass vessel 2 and this vessel 2 is covered with a glass lid 3 and heated in vacuum in a hot isostatic press sintering furnace to coat the material 1 with the softened glass. The material 1 is then sintered by heating under the pressure of gas in the furnace. When the glass vessel 2 reacts with the material 1 to be sintered or sticks to the material 1, a powdery releasing agent 4 such as boron nitride powder is preferably interposed between the vessel 2 and the material 1.

    PRODUCTION OF HIGH-TEMPERATURE SUPERCONDUCTING CRYSTALLIZED GLASS
    6.
    发明专利
    PRODUCTION OF HIGH-TEMPERATURE SUPERCONDUCTING CRYSTALLIZED GLASS 失效

    公开(公告)号：JPH02188445A

    公开(公告)日：1990-07-24

    申请号：JP900089

    申请日：1989-01-17

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： TANIGAWA HIDEO ,  OGURA TORU ,  MATSUBARA ICHIRO ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU

    IPC: C03C10/02 ,  C03C3/12 ,  C03C3/253 ,  C03C4/14

    Abstract: PURPOSE:To obtain the high-temp. superconducting crystallized glass capable of being easily worked into various forms, e.g. film, ribbon, and filament, while keeping its characteristic as a superconductor by using a specified glass composition, melting the composition by heating, and crystallizing the molten composition by heat treatment. CONSTITUTION:From 0.02 to 0.08 pts.wt. of Au or Pt is added to 100 pts.wt. of a mixed powder contg., by weight, 3.7-4.9% GeO2 or Ge2O3, 39.0-39.5% Bi2O3, 20.1-20.3% SrO2, 9.4-9.5% CaO, and 26.6-27.0% CuO. The mixture is heated and melted to produce glass, and the glass is crystallized by heat treatment. Colloidal Au or Pt has to be incorporated into the glass as the crystalline nucleus. Accordingly, Au or Pt is preferably incorporated into the starting raw mixture in the form of the aq. soln. of chloroauric acid (HAuCl4.4H2O) or hexachloroplatinic acid (H2PtCl6.6H2O).

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