Self-Propagating High-temperature Synthesis of AIN Nanostructures and Their Sintering Properties

Radwan, Mohamed; Miyamoto, Yoshinari

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タイトル	Self-Propagating High-temperature Synthesis of AIN Nanostructures and Their Sintering Properties
著者	Radwan, Mohamed Radwan, Mohamed
著者	Miyamoto, Yoshinari Miyamoto, Yoshinari
キーワード等	SHS
	AlN
	Nanofibers
	Morphology Control
抄録	This investigation describes novel growth of quasi-aligned aluminum nitride (AlN) nanofibers by the self-propagating high-temperature synthesis (SHS) under low nitrogen pressure. The starting charge consists of Al and AlN diluent (40/60 mole%) with a mixture of Y₂O₃ and NH₄Cl additives (5wt% each). The combustion reaction was performed under 0.25 MPa N₂ pressure. The microstructure of as-synthesized AlN powder consists of two major types; aggregates of irregular particles (~0.5 μm, the same as the original AlN diluent) and balls-like grains (same size and shape as original Al particles) consisting of a thin crust (≤150 nm) covering unique quasi-aligned AlN nanofibers grown in the interior. This powder can be easily consolidated to near theoretical density without sintering additives in a period of 5 min at 1600 ℃ using the spark plasma sintering (SPS) process. The microstructure of sintered AlN was homogeneous with dual morphologies of many ultrafine sub-grains (fibers, nanometer size in diameter) aggregated in large grains. The thermal conductivity was 91 W/m-K.
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	35
号	2
開始ページ	43
終了ページ	46
刊行年月	2006-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/8996
言語	英語

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.35(2) P.43-P.46
DC.title	Self-Propagating High-temperature Synthesis of AIN Nanostructures and Their Sintering Properties
DC.creator	Radwan, Mohamed
DC.creator	Miyamoto, Yoshinari
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	2006-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/8996
DC.subject	SHS
	AlN
	Nanofibers
	Morphology Control
DCTERMS.abstract	This investigation describes novel growth of quasi-aligned aluminum nitride (AlN) nanofibers by the self-propagating high-temperature synthesis (SHS) under low nitrogen pressure. The starting charge consists of Al and AlN diluent (40/60 mole%) with a mixture of Y₂O₃ and NH₄Cl additives (5wt% each). The combustion reaction was performed under 0.25 MPa N₂ pressure. The microstructure of as-synthesized AlN powder consists of two major types; aggregates of irregular particles (~0.5 μm, the same as the original AlN diluent) and balls-like grains (same size and shape as original Al particles) consisting of a thin crust (≤150 nm) covering unique quasi-aligned AlN nanofibers grown in the interior. This powder can be easily consolidated to near theoretical density without sintering additives in a period of 5 min at 1600 ℃ using the spark plasma sintering (SPS) process. The microstructure of sintered AlN was homogeneous with dual morphologies of many ultrafine sub-grains (fibers, nanometer size in diameter) aggregated in large grains. The thermal conductivity was 91 W/m-K.
citation_title	Self-Propagating High-temperature Synthesis of AIN Nanostructures and Their Sintering Properties
citation_author	Radwan, Mohamed
citation_author	Miyamoto, Yoshinari
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2006-12
citation_journal_title	Transactions of JWRI
citation_volume	35
citation_issue	2
citation_firstpage	43
citation_lastpage	46
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/8996
citation_keywords	SHS
	AlN
	Nanofibers
	Morphology Control

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