High Temperature Properties of Unidirectionally Solidified Al<SUB>2</SUB>O<SUB>3</SUB>/YAG Composites

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  • Waku Yoshiharu
    Ube Research Laboratory, Corporate Research & Development, UBE Industries, Ltd.
  • Nakagawa Narihito
    Ube Research Laboratory, Corporate Research & Development, UBE Industries, Ltd.
  • Ohtsubo Hideki
    Ube Research Laboratory, Corporate Research & Development, UBE Industries, Ltd.
  • Ohsora Yasumasa
    Ube Research Laboratory, Corporate Research & Development, UBE Industries, Ltd.
  • Kohtoku Yasuhiko
    Ube Research Laboratory, Corporate Research & Development, UBE Industries, Ltd.

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Other Title
  • 一方向凝固Al<SUB>2</SUB>O<SUB>3</SUB>/YAG複合材料の製造と高温特性
  • 1方向凝固Al2O3/YAG複合材料の製造と高温特性
  • 1ホウコウ ギョウコ Al2O3 YAG フクゴウ ザイリョウ ノ セイゾウ

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Abstract

In order to develop stable composite materials in air atmosphere above 1673 K, fabrication of unidirectional solidification of Al2O3/Y2O3 mixed powders (82/18 mol ratio) was carried out in 10−5 mmHg vacuum at the 5 mm/h down speed using advanced alloy crystalline structure controlling equipments at Japan Ultra-high Temperature Materials Research Center. The microstructures of the unidirectional solidified eutectic composites were composed of single crystal (110) Al2O3 and single crystal (420) YAG containing no colony and porosity. No temperature dependence of flexural strength of the composites from room temperature to 1973 K was observed and the flexural strength is 360∼500 MPa. It is found that the composites have superior creep resistance at 1873∼1973 K, oxidation-resistance and thermal stability at 1973 K for 50 h in air atmosphere.

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