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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
Afrasiabi, Abbas
Afrasiabi, Abbas
Kobayashi, Akira
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.
公開者
大阪大学接合科学研究所
公開者の別表記
Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)
オオサカ ダイガク セツゴウ カガク ケンキュウジョ
掲載誌名
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
ISSN
03874508
NCID
AA00867058
URL
http://hdl.handle.net/11094/12681
言語
英語
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.37 No.2 (2008-12)
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著者版フラグ
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text
DCTERMS.bibliographicCitation
Transactions of JWRI.37(2) P.57-P.61
DC.title
The Effect of an Additional Alumina Layer in Improvement of Plasma Sprayed TBCs during High Temperature Applications
DC.creator
Afrasiabi, Abbas
Kobayashi, Akira
DC.publisher
大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766
英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF
2008-12
DC.identifier" scheme="DCTERMS.URI
http://hdl.handle.net/11094/12681
DC.subject
Hot corrosion
TBC
Plasma spray
YSZ/Al₂O₃
Oxidation
DCTERMS.abstract
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.
citation_title
The Effect of an Additional Alumina Layer in Improvement of Plasma Sprayed TBCs during High Temperature Applications
citation_author
Afrasiabi, Abbas
Kobayashi, Akira
citation_publisher
大阪大学接合科学研究所
citation_language
英語
citation_date
2008-12
citation_journal_title
Transactions of JWRI
citation_volume
37
citation_issue
2
citation_firstpage
57
citation_lastpage
61
citation_issn
03874508
citation_public_url
http://hdl.handle.net/11094/12681
citation_keywords
Hot corrosion
TBC
Plasma spray
YSZ/Al₂O₃
Oxidation