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Fabrication of mixed α/β-SiAlON powders via salt-assisted combustion synthesis

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Title: Fabrication of mixed α/β-SiAlON powders via salt-assisted combustion synthesis
Authors: Niu, Jing Browse this author
Harada, Kazuto Browse this author
Suzuki, Shota Browse this author
Nakatsugawa, Isao Browse this author
Okinaka, Noriyuki Browse this author
Akiyama, Tomohiro Browse this author →KAKEN DB
Keywords: SiAlON
Gas-solid reactions
Phase composition
Issue Date: 15-Aug-2014
Publisher: Elsevier
Journal Title: Journal of Alloys and Compounds
Volume: 604
Start Page: 260
End Page: 265
Publisher DOI: 10.1016/j.jallcom.2014.03.145
Abstract: High-quality Y-and Ca-α/β-SiAlON and α-SiAlON ceramics were synthesized via salt-assisted combustion synthesis from Si, Al, and metal oxide (Y2O3 and CaO) with the addition of NaCl and MgCl2 under a nitrogen pressure of 1 MPa. NaCl and MgCl2 were employed as they act as excellent diluents that effectively absorb the reaction heat through melting and evaporation. We found that the type of metal chlorides employed significantly affected the α/β ratio and the morphology of the product, with the use of NaCl affording high α/β ratios and equiaxed morphologies, while the use of MgCl2 resulting in low α/β ratios and elongated grains. The results of this work suggest that high-purity α/β-SiAlON composite products of intended α/β ratios can be successfully fabricated by controlling the initial metal chloride content.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 秋山 友宏

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