Solid State Synthesis of Mg₂Si/MgO Composites from an Elemental Mixture Powder of Magnesium and Rice Husk Silica

Umeda, Junko; Kondoh, Katsuyoshi; Kawakami, Masashi; Imai, Hisashi

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タイトル	Solid State Synthesis of Mg₂Si/MgO Composites from an Elemental Mixture Powder of Magnesium and Rice Husk Silica
著者	Umeda, Junko Umeda, Junko
	Kondoh, Katsuyoshi Kondoh, Katsuyoshi
	Kawakami, Masashi Kawakami, Masashi
	Imai, Hisashi Imai, Hisashi
キーワード等	Rice Husk Silica
	Magnesium
	Mg₂Si Solid State Reaction
	Amorphous
抄録	The utilization of silica particles originating in rice husks as reinforcements for magnesium is discussed. The reactivity of magnesium with silica particles in the solid state to synthesize magnesium silicide (Mg₂Si) was investigated by DTA and XRD analysis. Finer silica particles were more effective for reacting with magnesium at low temperature due to the increase of their surface area in contact with magnesium. Amorphous silica was more useful for the reaction than the crystalline form. The reactivity of rice husk silica was superior to that of the conventional mineral silica particles because of not only its amorphous structure but the larger specific surface area caused by the pore structures. In the case of a green compact of the elemental mixture of silica particles and Mg powder, the silica particle size was not effective on the reactivity because the coarse particles are fractured into fine ones by cold compaction at the applied pressure of 600 MPa. The distribution of Mg₂Si intermetallics in magnesium powder composites consolidated by the SPS process was investigated by XRD and SEM-EDS analysis. When the sintering temperature was over the exothermic temperature of the elemental mixtures of silica particles and Mg powder in the DTA profile, the synthesis of Mg₂Si occurs completely occurs during sintering. The density and hardness of their composites sintered over the ignition temperature of the DTA profile were remarkably high because of the good densification by the high reactivity and the distribution of Mg₂Si hard compounds.
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	1
開始ページ	113
終了ページ	117
刊行年月	2008-07
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/4713
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.37(1) P.113-P.117
DC.title	Solid State Synthesis of Mg₂Si/MgO Composites from an Elemental Mixture Powder of Magnesium and Rice Husk Silica
DC.creator	Umeda, Junko
	Kondoh, Katsuyoshi
	Kawakami, Masashi
	Imai, Hisashi
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	2008-07
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/4713
DC.subject	Rice Husk Silica
	Magnesium
	Mg₂Si Solid State Reaction
	Amorphous
DCTERMS.abstract	The utilization of silica particles originating in rice husks as reinforcements for magnesium is discussed. The reactivity of magnesium with silica particles in the solid state to synthesize magnesium silicide (Mg₂Si) was investigated by DTA and XRD analysis. Finer silica particles were more effective for reacting with magnesium at low temperature due to the increase of their surface area in contact with magnesium. Amorphous silica was more useful for the reaction than the crystalline form. The reactivity of rice husk silica was superior to that of the conventional mineral silica particles because of not only its amorphous structure but the larger specific surface area caused by the pore structures. In the case of a green compact of the elemental mixture of silica particles and Mg powder, the silica particle size was not effective on the reactivity because the coarse particles are fractured into fine ones by cold compaction at the applied pressure of 600 MPa. The distribution of Mg₂Si intermetallics in magnesium powder composites consolidated by the SPS process was investigated by XRD and SEM-EDS analysis. When the sintering temperature was over the exothermic temperature of the elemental mixtures of silica particles and Mg powder in the DTA profile, the synthesis of Mg₂Si occurs completely occurs during sintering. The density and hardness of their composites sintered over the ignition temperature of the DTA profile were remarkably high because of the good densification by the high reactivity and the distribution of Mg₂Si hard compounds.
citation_title	Solid State Synthesis of Mg₂Si/MgO Composites from an Elemental Mixture Powder of Magnesium and Rice Husk Silica
citation_author	Umeda, Junko
	Kondoh, Katsuyoshi
	Kawakami, Masashi
	Imai, Hisashi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2008-07
citation_journal_title	Transactions of JWRI
citation_volume	37
citation_issue	1
citation_firstpage	113
citation_lastpage	117
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/4713
citation_keywords	Rice Husk Silica
	Magnesium
	Mg₂Si Solid State Reaction
	Amorphous

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