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

Umeda, Junko; Kondoh, Katsuyoshi; Kawakami, Masashi et al.

Transactions of JWRI, 2008, 37(1), 113-117

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Identifier to cite or link to this item: https://doi.org/10.18910/4713

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Title
Solid State Synthesis of Mg₂Si/MgO Composites from an Elemental Mixture Powder of Magnesium and Rice Husk Silica
Creator
NRID
1000050345162 1000050345162
researchmap permalink
umeda umeda
Scopus Author ID
23478776500 23478776500
ORCID
0000-0001-8678-9708 0000-0001-8678-9708
CreatorName
Umeda, Junko
NRID
1000050345138 1000050345138
researchmap permalink
kondoh kondoh
Scopus Author ID
9942942300 9942942300
CreatorName
Kondoh, Katsuyoshi
CreatorName
Kawakami, Masashi
NRID
1000030452379 1000030452379
CreatorName
Imai, Hisashi
Subject
Rice Husk Silica
Magnesium
Mg₂Si Solid State Reaction
Amorphous
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.
Publisher
大阪大学接合科学研究所
オオサカ ダイガク セツゴウ カガク ケンキュウジョ
Joining and Welding Research Institute, Osaka University
Source Title
Transactions of JWRI
Volume (Issue)
37(1)
Page
113-117
Date of Issued
2008-07
Language
English
Handle URL
https://hdl.handle.net/11094/4713
DOI
https://doi.org/10.18910/4713
PISSN
03874508
NCID
AA00867058
Access Rights
open access
oaire:version
Version of Record
Category
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.37 No.1 (2008-07)