CMAS degradation of ytterbium aluminum garnets

DOI 被引用文献2件
  • Satoshi Kitaoka
    Materials Research and Development Laboratory Research and Development Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Makoto Tanaka
    Materials Research and Development Laboratory Research and Development Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Naoki Kawashima
    Materials Research and Development Laboratory Research and Development Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Taishi Ito
    Nanostructures Research Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Daisaku Yokoe
    Nanostructures Research Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Takeharu Kato
    Nanostructures Research Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Takafumi Ogawa
    Nanostructures Research Laboratory Japan Fine Ceramics Center Nagoya Japan
  • Naoki Yamazaki
    Technology and Intelligence Integration IHI Corporation Yokohama Japan
  • Nagisa Hosoya
    Technology and Intelligence Integration IHI Corporation Yokohama Japan
  • Takeshi Nakamura
    Aero Engine, Space and Defense Business Area IHI Corporation Tokyo Japan

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<jats:title>Abstract</jats:title><jats:p>The degradation of ytterbium aluminum garnet (YbAG) exposed to molten Ca–Mg–Fe–Al–Si–O (CMAS) at 1673 K was investigated for two kinds of dense polycrystalline YbAG with compositions deviating slightly from stoichiometry, referred to as Al‐ and Yb‐rich. The mitigation of the CMAS attack for Yb‐rich YbAG was markedly superior to that for the Al‐rich one. For both types of YbAG, corrosion progressed due to the preferential penetration of the CMAS melt along grain boundaries in the thickness direction and the simultaneous dissolution of crystal grains into the melt. The lower of the corroded region consisted of YbAG crystals with a core/shell‐I/shell‐II structure. Shell‐I contained alkaline earth, silicon, and iron cations, whereas these cations were hardly detected in shell‐II. Growth of the shell‐I region was considered to progress by dissolution and reprecipitation through the melt existing around it, and finally, the melt disappeared, resulting in the formation of a thin shell‐II region containing little of these ions. The formation and growth of the shell‐I region were found to be promoted by making the YbAG Yb‐rich, resulting in enhancement of the resistance to CMAS.</jats:p>

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詳細情報 詳細情報について

  • CRID
    1360583647576062208
  • DOI
    10.1111/jace.19110
  • ISSN
    15512916
    00027820
  • データソース種別
    • Crossref

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