The Effect of an Additional Alumina Layer in Improvement of Plasma Sprayed TBCs during High Temperature Applications

Afrasiabi, Abbas; Kobayashi, Akira

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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
著者	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
カテゴリ	Transactions of JWRI / Vol.37 No.2 (2008-12)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	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
DC.creator	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
citation_author	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

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