Studies on Vacuum Brazing (Report II) : Removal of oxide film from stainless steel surface and brazing alloy spreading mechanism(Welding Physics, Process & Instrument)

Arata, Yoshiaki; Ohmori, Akira; Cai, Huai Fu

doi:https://doi.org/10.18910/9193

Studies on Vacuum Brazing (Report II) : Removal of oxide film from stainless steel surface and brazing alloy spreading mechanism(Welding Physics, Process & Instrument)

Arata, Yoshiaki; Ohmori, Akira; Cai, Huai Fu

Transactions of JWRI, 1983, 12(1), 27-34

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固定URL: https://doi.org/10.18910/9193

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タイトル	Studies on Vacuum Brazing (Report II) : Removal of oxide film from stainless steel surface and brazing alloy spreading mechanism(Welding Physics, Process & Instrument)
著者	著者名 Arata, Yoshiaki
	NRID 1000050029229 1000050029229 著者名 Ohmori, Akira
	著者名 Cai, Huai Fu
抄録	Vacuum brazing of stainless steel was studied on both the mechanism of removal of oxide film from stainless steel (SUS304L, SUS3042B, SUS321) surfaces in vacuum heating and the spread mechanism of brazing alloy (BAg-8b) on stainless steel. The surface change of state with vacuum heating was observed by a high temperature optical microscope. The growth and removal of oxide on the surface with heating was clarified. The spreading phenomena were investigated by SEM, EDX, AES and Mass spectroscopy. The growth of oxide on the surface (SUS304L and SUS3042B) in vacuum heating from 550℃ to 750℃ was confirmed and the grown oxide was removed with more heating to 860℃, preferentially at the grain boundary part of the surface by reduction reaction of the carbon contained in steel. The phenomenon was confirmed by a striking increase in CO gas in vacuum atmosphere. The spreading of brazing alloy is due to the penetration of alloy into the grain boundary grooves produced by removing the oxide on the surface in vacuum heating. The spreadability was greatly influenced by heating speed in vacuum. Copper or copper-rich alloy diffuses primarily along the grooves without oxide and then liquid brazing alloy easily impregnats them and spreads on the surface. With SUS 321, the removal of oxide film and the formation of grain boundary grooves occur at a temperature of about 900℃ which is higher than that for SUS304L.
出版者	大阪大学溶接工学研究所
	オオサカダイガクヨウセツコウガクケンキュウジョ
	Welding Research Institute of Osaka University
収録物名	Transactions of JWRI
巻(号)	12(1)
ページ	27-34
刊行年月	1983-08
言語	英語
ハンドルURL	https://hdl.handle.net/11094/9193
DOI	https://doi.org/10.18910/9193
PISSN	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
カテゴリ	Transactions of JWRI / Vol.12 No.1 (1983-08)

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. 1983, 12(1), p. 27-34
DC.title	Studies on Vacuum Brazing (Report II) : Removal of oxide film from stainless steel surface and brazing alloy spreading mechanism(Welding Physics, Process & Instrument)
DC.creator	Arata, Yoshiaki
	Ohmori, Akira
	Cai, Huai Fu
DC.publisher	大阪大学溶接工学研究所
	オオサカダイガクヨウセツコウガクケンキュウジョ
	Welding Research Institute of Osaka University
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	1983-08
DCTERMS.abstract	Vacuum brazing of stainless steel was studied on both the mechanism of removal of oxide film from stainless steel (SUS304L, SUS3042B, SUS321) surfaces in vacuum heating and the spread mechanism of brazing alloy (BAg-8b) on stainless steel. The surface change of state with vacuum heating was observed by a high temperature optical microscope. The growth and removal of oxide on the surface with heating was clarified. The spreading phenomena were investigated by SEM, EDX, AES and Mass spectroscopy. The growth of oxide on the surface (SUS304L and SUS3042B) in vacuum heating from 550℃ to 750℃ was confirmed and the grown oxide was removed with more heating to 860℃, preferentially at the grain boundary part of the surface by reduction reaction of the carbon contained in steel. The phenomenon was confirmed by a striking increase in CO gas in vacuum atmosphere. The spreading of brazing alloy is due to the penetration of alloy into the grain boundary grooves produced by removing the oxide on the surface in vacuum heating. The spreadability was greatly influenced by heating speed in vacuum. Copper or copper-rich alloy diffuses primarily along the grooves without oxide and then liquid brazing alloy easily impregnats them and spreads on the surface. With SUS 321, the removal of oxide film and the formation of grain boundary grooves occur at a temperature of about 900℃ which is higher than that for SUS304L.
DC.identifier	10.18910/9193
DC.format	9193
citation_title	Studies on Vacuum Brazing (Report II) : Removal of oxide film from stainless steel surface and brazing alloy spreading mechanism(Welding Physics, Process & Instrument)
citation_author	Arata, Yoshiaki
	Ohmori, Akira
	Cai, Huai Fu
citation_publisher	大阪大学溶接工学研究所
citation_language	英語
citation_date	1983-08
citation_journal_title	Transactions of JWRI
citation_volume	12
citation_issue	1
citation_firstpage	27
citation_lastpage	34
citation_public_url	https://hdl.handle.net/11094/9193
citation_doi_detail	10.18910/9193
citation_doi	https://doi.org/10.18910/9193

Studies on Vacuum Brazing (Report II) : Removal of oxide film from stainless steel surface and brazing alloy spreading mechanism(Welding Physics, Process & Instrument)

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