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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:604

Article

Niu, Jing¹  Harada, Kazuto²  Suzuki, Shota¹  Nakatsugawa, Isao²  Okinaka, Noriyuki¹  Akiyama, Tomohiro¹ 

[1] Hokkaido Univ, Ctr Adv Res Energy & Mat, Kita Ku, Sapporo, Hokkaido 0608628, Japan

[2] Combust Synth Co Ltd, Numazu, Shizuoka 4100801, Japan

关键词: SiAlON;    Gas-solid reactions;    Salt-assisted;    Phase composition;    Microstructure;   

DOI  :  10.1016/j.jallcom.2014.03.145

来源: Elsevier

【 摘 要 】

High-quality Y-and Ca-alpha/beta-SiAlON and alpha-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 alpha/beta ratio and the morphology of the product, with the use of NaCl affording high alpha/beta ratios and equiaxed morphologies, while the use of MgCl2 resulting in low alpha/beta ratios and elongated grains. The results of this work suggest that high-purity alpha/beta-SiAlON composite products of intended alpha/beta ratios can be successfully fabricated by controlling the initial metal chloride content. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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