雑誌ブラウズ
雑誌 全て
大阪大学 刊行物
ランキング
アクセスランキング
ダウンロードランキング
博士論文のみをさがす
リポジトリ登録支援システム
附属図書館
このアイテムのアクセス数:
97
件
(
2022-06-30
07:04 集計
)
このアイテムへのリンクには次のURLをご利用ください:http://hdl.handle.net/11094/4713
閲覧可能ファイル
ファイル
フォーマット
サイズ
閲覧回数
説明
jwri37_01_113
pdf
525 KB
158
論文情報
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
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.37 No.1 (2008-07)
論文詳細を表示
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