Spectroscopic Characterization of Smart Spraying Plasmas for Thermal Barrier Coatings Preparation

Kobayashi, Akira; Ishibashi, Norifumi

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タイトル	Spectroscopic Characterization of Smart Spraying Plasmas for Thermal Barrier Coatings Preparation
著者	Kobayashi, Akira Kobayashi, Akira
著者	Ishibashi, Norifumi Ishibashi, Norifumi
キーワード等	Spraying plasma plume
	Spatial emission profile
	Thermal barrier coatings
	Excitation temperature
	Energy dissipation pattern
抄録	Thermal Barrier Coatings (TBCs) are frequently prepared by the thermal plasma spraying method. The performance of the TBC coating is strongly determined by process parameters, such as particle temperature and velocity, plasma temperature and range. In this paper, an optical emission spectroscopy system is used to determine the excitation temperature generated by a gas tunnel type cascade arc plasma gun and a high speed CCD camera is used to image the spatial profile of plasma emission intensity in the form of successive frames at a time resolution of 30μs and to get the plasma range. As both of them are believed to be the key factors for determining the molten surface status and velocity of the sprayed particles, the plasma temperature and range are presented as the tendencies dependent on discharge power and gas flow rate. Based on these tendencies, the radiation power and heat flux from the plasma are evaluated, the plasma velocity at the exit of the generation gun has been solved theoretically. In order to show the effect of powder injection on the plasma plume, when Al₂O₃ powder is injected by the argon carrier, the plasma temperature is calculated from the emission spectra of aluminum atoms melted away from the powder particles and is lower than that obtained from argon spectra.
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	34
号	1
開始ページ	25
終了ページ	30
刊行年月	2005-07
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/8415
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.34 No.1 (2005-07)

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.34(1) P.25-P.30
DC.title	Spectroscopic Characterization of Smart Spraying Plasmas for Thermal Barrier Coatings Preparation
DC.creator	Kobayashi, Akira
DC.creator	Ishibashi, Norifumi
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	2005-07
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/8415
DC.subject	Spraying plasma plume
	Spatial emission profile
	Thermal barrier coatings
	Excitation temperature
	Energy dissipation pattern
DCTERMS.abstract	Thermal Barrier Coatings (TBCs) are frequently prepared by the thermal plasma spraying method. The performance of the TBC coating is strongly determined by process parameters, such as particle temperature and velocity, plasma temperature and range. In this paper, an optical emission spectroscopy system is used to determine the excitation temperature generated by a gas tunnel type cascade arc plasma gun and a high speed CCD camera is used to image the spatial profile of plasma emission intensity in the form of successive frames at a time resolution of 30μs and to get the plasma range. As both of them are believed to be the key factors for determining the molten surface status and velocity of the sprayed particles, the plasma temperature and range are presented as the tendencies dependent on discharge power and gas flow rate. Based on these tendencies, the radiation power and heat flux from the plasma are evaluated, the plasma velocity at the exit of the generation gun has been solved theoretically. In order to show the effect of powder injection on the plasma plume, when Al₂O₃ powder is injected by the argon carrier, the plasma temperature is calculated from the emission spectra of aluminum atoms melted away from the powder particles and is lower than that obtained from argon spectra.
citation_title	Spectroscopic Characterization of Smart Spraying Plasmas for Thermal Barrier Coatings Preparation
citation_author	Kobayashi, Akira
citation_author	Ishibashi, Norifumi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2005-07
citation_journal_title	Transactions of JWRI
citation_volume	34
citation_issue	1
citation_firstpage	25
citation_lastpage	30
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/8415
citation_keywords	Spraying plasma plume
	Spatial emission profile
	Thermal barrier coatings
	Excitation temperature
	Energy dissipation pattern

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