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jwri37_02_057 pdf 738 KB 118 2012.09.22

論文情報

タイトル
The Effect of an Additional Alumina Layer in Improvement of Plasma Sprayed TBCs during High Temperature Applications
著者
著者名
Afrasiabi, Abbas
著者名
Kobayashi, Akira
キーワード等
Hot corrosion
TBC
Plasma spray
YSZ/Al₂O₃
Oxidation
抄録
Hot corrosion and bond coat oxidation are the main destructive factors in thermal barrier coatings (TBCₛ) and are the result of oxygen and molten salt penetration on the coating-gas interface. Hot corrosion and oxygen penetration behavior of two types of plasma sprayed TBCs were evaluated: a) usual YSZ (yttria stabilized zirconia), b) layer composite of YSZ/Al₂O₃ in which Al₂O₃ was as a top coat on a YSZ layer. Hot corrosion tests were carried out on the surface of coatings in molten salt (Na₂SO₄+V₂O₅) at 1050 ℃ for 40 h. The formation of monoclinic ZrO₂ and YVO₄ crystals as hot corrosion products caused the degradation of the mentioned TBCs. Oxidation tests were carried out on the coatings at 1100℃ for 22, 42 and 100 hours. Microstructure studies demonstrated the growth of TGO underneath the YSZ coating is higher than for YSZ/Al₂O₃ coating. Cracking was also observed in usual YSZ coating at the YSZ/ bond coat interface. So alumina coating as outer layer in YSZ/Al₂O₃ reduced the penetration of oxygen and molten salt into YSZ and resulted in the further resistance of TBC during high temperature application.
出版者
大阪大学接合科学研究所
オオサカ ダイガク セツゴウ カガク ケンキュウジョ
Joining and Welding Research Institute, Osaka University
収録物名
Transactions of JWRI
巻
37
号
2
開始ページ
57
終了ページ
61
刊行年月
2008-12
言語
英語
ハンドルURL
https://hdl.handle.net/11094/12681
ISSN
03874508
NCID
AA00867058
アクセス権
open access
出版タイプ
Version of Record
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.37 No.2 (2008-12)