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    PRODUCTION OF GLASS HAVING REFRACTORY INDEX DISTRIBUTION
    11.
    发明专利
    PRODUCTION OF GLASS HAVING REFRACTORY INDEX DISTRIBUTION 失效

    公开(公告)号：JPH04149033A

    公开(公告)日：1992-05-22

    申请号：JP27422390

    申请日：1990-10-11

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： KITAMURA NAOYUKI ,  KINUGAWA KENICHI ,  MATSUOKA JUN ,  FUKUMI KOHEI ,  KONDO ISAO ,  OSE SABURO ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU

    IPC: C03B11/00 ,  C03B20/00

    Abstract: PURPOSE:To control the refractive index distribution by pressurizing a glass below the glass transition point or pressurizing the glass at the glass transition point or above, then heat-treaching the glass below the glass transition point to obtain a specified density distribution. CONSTITUTION:A glass such as quartz glass having a uniform composition and difficult to crystallize is heated below the glass transition point, pressurized by a high-pressure device and then cooled to room temp. before the pressure difference is saturated during the specified holding time to obtain a glass with the density progressively increased toward the surface layer part, i.e., having a large refractive index. Alternately, the glass is heated at the glass transition point or above, pressurized by the high-pressure device to reduce the nonuniformity in pressure exerted on the glass to eliminate the pressure difference between the surface layer part and center part. The treated glass is again heat-treated under low pressure below the glass transition point to progressively reduce the density from the surface layer part. The glass is cooled under these conditions to obtain a treated glass with the density progressively increased toward the center part, i.e., with the refractive index distribution increased toward the center part.

    SUPERCONDUCTING FIBROUS CRYSTAL AND PRODUCTION THEREOF
    12.
    发明专利
    SUPERCONDUCTING FIBROUS CRYSTAL AND PRODUCTION THEREOF 失效

    公开(公告)号：JPH02252621A

    公开(公告)日：1990-10-11

    申请号：JP7364189

    申请日：1989-03-23

    Applicant: AGENCY IND SCIENCE TECHN

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

    IPC: C01G29/00 ,  C01G1/00 ,  C30B9/00 ,  C30B11/00 ,  C30B25/00 ,  C30B29/22 ,  C30B29/64 ,  D01F9/08

    Abstract: PURPOSE:To obtain a bendable superconducting fibrous crystal by adding a specific amount of a specific element as an auxiliary component to a raw material for a Bi2Sr2CaCu2Ox superconductor, melting and then quenching the mixture and heat-treating the obtained solid in oxygen gas stream. CONSTITUTION:A superconducting fibrous crystal having atomic ratios of Bi2Sr2 CaCu2Ox (x is 7.8-8.2) is produced by preparing a molten mixture having atomic ratios of Bi=1, Sr=0.7 to 1.3, Ca=0.7 to 1.5. Cu=1.5 to 2.5, O=3.5 to 8.8 and M=0.15 to 0.35 (M is one or more elements selected from Pb, Sn, Sb, In, Cd, Ga, Ge, K and Na), quenching the molten mixture and heat-treating the obtained solid in oxygen gas stream. The obtained superconducting fibrous crystal has a merit of bendability and is suitable e.g. as a magnet material for the generation of magnetic field.

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