新しい組織構造を持つMGC材料の高温特性

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タイトル別名
  • High Temperature Characteristics of Melt Growth Composites with a Novel Microstructure
  • 新しい組織構造を持つMGC材料の高温特性(解説論文)
  • アタラシイ ソシキ コウゾウ オ モツ MGC ザイリョウ ノ コウオン トクセイ カイセツ ロンブン

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MGCs(Melt Growth Composites) with a new microstructure such as Al2O3/Y3Al5O12(YAG) system, Al2O3/Er3Al5O12(EAG) system and Al2O3/GdAlO3(GAP) system have been fabricated by unidirectional solidification. The MGCs have a microstructure, in which single crystal Al2O3 and single crystal complex oxide compound (YAG or EAG or GAP) are continuously connected and finely entangled in three-dimensions without grain boundaries. The MGCs are thermally stable and have the following properties: (1) The Al2O3/GAP MGC shows substantial plastic deformation at 1873 K with a flexural yield stress of about 690 MPa, where the plastic deformation occured by dislocation motion in each phase. (2) In the case of Al2O3/YAG MGCs, the flexural strength at room temperature can be maintained almost up to the melring point, (3) the compressive creep strain of Al2O3/YAG MGCs at 1873 K and a creep stress of 200 MPa is around 1/900 times lower than that of sintered composites of the same composition, and (4) Al2O3/YAG MGCs and Al2O3/EAG MGCs show neither weigth gain nor grain growth, even upon heating at 1973 K in an air atmosphere for 1000 hours. Consequently, these MGCs can be considered for several useful application such as new aero gas turbines and power generation systems with non-cooled turbine blabes at very high temperatures.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 64 (11), 977-984, 2000

    公益社団法人 日本金属学会

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