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Yoshiharu Waku - One of the best experts on this subject based on the ideXlab platform.

  • Development of Near-Net Shape Casting Technology for MGC Components
    Volume 1: Turbo Expo 2005, 2005
    Co-Authors: Yoshiharu Waku, Narihito Nakagawa, Kenji Kobayashi, Shinya Yokoi
    Abstract:

    Much attention has been paid to unidirectionally solidified ceramic composites as a candidate for a high-temperature structural material. Eutectic composites, known as Melt Growth Composites (MGCs), have recently been developed. The MGCs (Al2 O3 /YAG, Al2 O3 /GAP binary and Al2 O3 /YAG/ZrO2 ternary systems) have a novel microstructure consisting of three-dimensionally continuous and complexly entangled single-crystal Al2 O3 and single-crystal oxide compounds (YAG or GAP or YAG and ZrO2 ). Therefore, the MGCs have excellent high-temperature strength characteristics, creep resistance, superior oxidation resistance and thermal stability in an air atmosphere at very high temperatures. Manufacturing processes for the MGCs (Al2 O3 /YAG and Al2 O3 /GAP binary systems) are being examined under a Japanese national project, scheduled from 2001–2005. The molybdenum mold for near-net-Shaped Casting of the gas turbine component was fabricated by plasma spraying the molybdenum powders on the copper model. Near-net-Shape Casting of MGCs is being examined under the NEDO project using the plasma sprayed mold and a new Bridgman-type furnace.Copyright © 2005 by ASME

  • Solidification and Shape Casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

  • solidification and Shape Casting of al2o3 yag eutectic ceramics from the undercooled melt produced by melting al2o3 yap eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

Yoshiki Mizutani - One of the best experts on this subject based on the ideXlab platform.

  • Solidification and Shape Casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

  • solidification and Shape Casting of al2o3 yag eutectic ceramics from the undercooled melt produced by melting al2o3 yap eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

Hideyuki Yasuda - One of the best experts on this subject based on the ideXlab platform.

  • Solidification and Shape Casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

  • solidification and Shape Casting of al2o3 yag eutectic ceramics from the undercooled melt produced by melting al2o3 yap eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

Takumi Sakimura - One of the best experts on this subject based on the ideXlab platform.

  • Solidification and Shape Casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

  • solidification and Shape Casting of al2o3 yag eutectic ceramics from the undercooled melt produced by melting al2o3 yap eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

Satoshi Takeshima - One of the best experts on this subject based on the ideXlab platform.

  • Solidification and Shape Casting of Al2O3–YAG eutectic ceramics from the undercooled melt produced by melting Al2O3–YAP eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.

  • solidification and Shape Casting of al2o3 yag eutectic ceramics from the undercooled melt produced by melting al2o3 yap eutectics
    Science and Technology of Advanced Materials, 2004
    Co-Authors: Hideyuki Yasuda, Itsuo Ohnaka, Yoshiki Mizutani, Akira Sugiyama, Takashi Morikawa, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku
    Abstract:

    There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape Casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al2O3–YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the Castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.