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    PRODUCTION OF FIBER-REINFORCED CERAMIC-BASED COMPOSITE MATERIAL
    1.
    发明专利
    PRODUCTION OF FIBER-REINFORCED CERAMIC-BASED COMPOSITE MATERIAL 失效

    公开(公告)号：JPH11217273A

    公开(公告)日：1999-08-10

    申请号：JP3426998

    申请日：1998-01-30

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： SODEOKA MASARU ,  INOUE TAKAHIRO ,  UENO KAZUO ,  SUZUKI MASAHITO ,  KONDO ISAO

    IPC: C04B35/76 ,  C04B35/80

    Abstract: PROBLEM TO BE SOLVED: To efficiently produce a composite material having a high fracture energy without providing a heat damage to a reinforcing fiber at a short time by thermally spraying a ceramic material to the reinforcing fiber previously arranged in a prescribed position or shape to form a ceramic mother phase. SOLUTION: A carbon fiber, a ceramic fiber, a metal fiber or the like is oriented in uniaxial one dimensional, or two or more multiaxial two dimensional orientation to provide a reinforcing fiber. The reinforcing fibers are arranged on a metallic substrate, and a ceramic material such as an oxide ceramic such as alumina is thermally sprayed thereon. The thermally sprayed material in a molten state at a high temperature is quenched on the reinforcing fibers and accumulated to form a ceramic mother phase. Any of a plasma spraying, a glass-field flame spraying, a high-velocity flame spraying, an explosion spraying and a wire explosion spraying are suitable for the thermal spray method. A plurality of composite layers formed by repeating the method to laminate the layers and having a prescribed thickness is taken out from the substrate, and subjected to a necessary heat treatment and machine work to provide the objective fiber-reinforced ceramic-based composite material.

    PRODUCTION OF GLASS HAVING REFRACTORY INDEX DISTRIBUTION
    3.
    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.

    HOT ISOSTATIC PRESS SINTERING METHOD
    7.
    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.

    SURFACE TREATMENT OF CERAMIC
    8.
    发明专利
    SURFACE TREATMENT OF CERAMIC 失效

    公开(公告)号：JPH01219089A

    公开(公告)日：1989-09-01

    申请号：JP4384688

    申请日：1988-02-25

    Applicant: AGENCY IND SCIENCE TECHN ,  DAIHEN CORP

    Inventor： EHATA YOSHIHIRO ,  KAWAMOTO TAKAMICHI ,  KONDO ISAO ,  OKUDA KOJI ,  NISHI TOKUZO ,  MIYAKE NATSUMI

    IPC: C04B41/88 ,  C04B41/51

    Abstract: PURPOSE:To inhibit surface oxidation of ceramic whole body and deterioration of a base material and to reduce the cost of equipment by heating both the face to be treated of ceramic and a metallized material inserted between this face and a heating element with Joule's heat due to electrification of the heating element. CONSTITUTION:A metallic material 2 is inserted to the face to be treated of, e.g., prismatic ceramic 1 and the heating elements 3 are brought into contact with it and thereafter a supporting material 4 having insulation and heat insulating effect is placed thereon and pressurized to the direction vertical to the face to be treated of ceramic 1 and fixed. Then the electrodes 5a, 5b connected with an electric source device are fitted to the heating elements 3 and when voltage is impressed between them, Joule's heat is generated on the heating elements 3. As a result, the whole face to be treated of ceramic 1 incorporating the metallized material 2 is heated at high temp. Ceramic 1 and the metallized material 2 are strongly bonded by holding them for about five minutes and thereafter cooling them. Further, since the treated surface layer of ceramic after separating the heating elements 3 is not metallized, it is easily metallized by immersing it in reducing liquid.

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