[Updated on Apr. 18] Integration of CiNii Articles into CiNii Research

Microstructural Change During Heat Exposure in Air of Modeled Environmental Barrier Coating Processed by Aerosol Deposition Method

DOI
  • HASEGAWA Makoto
    Division of Systems Research, Faculty of Engineering, Yokohama National University
  • SHIBUYA Toshiki
    Department of Systems Integration, Graduate School of Engineering, Yokohama National University
  • IUCHI Atsuhisa
    Department of Systems Integration, Graduate School of Engineering, Yokohama National University
  • MIZUNO Taisuke
    Department of Systems Integration, Graduate School of Engineering, Yokohama National University

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Other Title
  • エアロゾルデポジション法により作製したモデル環境バリアコーティングの大気熱曝露による組織変化
  • エアロゾルデポジションホウ ニ ヨリ サクセイ シタ モデル カンキョウ バリアコーティング ノ タイキ ネツ バクロ ニ ヨル ソシキ ヘンカ

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Abstract

Optimal deposition parameters for the aerosol deposition of a β-SiAlON coating and the microstructure change of an EBC after heat exposure in air are investigated. Dense and crystalline SiAlON coating having developed texture, where the (0001) plane is declined approximately 10° from the coating plane is formed. The deposition rate increases with the gas flow rate when the rate is ranging from 12 to 16 L/min. Further increase of the gas flow rate decreases the deposition rate. Regarding the 15 μm thick mullite coating deposited on SiAlON substrate heat exposed at 1573 K over 30 h, delamination of the coating occurs due to the oxidation of SiAlON. 30 μm thick mullite coating prevents the oxidation. As for the EBC deposited on Si-SiC substrate, delamination occurs at Si-SiC/SiAlON interface by the oxidation of SiC during heat exposure at 1573 K. At the bonded region during heat exposure, SiAlON prevent the mullite coating to become (SiO2+mullite) two-phase state by supplying Al to the mullite. Residual Si at the substrate move to SiAlON and mullite coating under heat exposure at 1673 K. Structure of EBC is maintained by using SiC substrate in which the Si will not move to the coating during exposure

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