Reaction mechanism for in-situ β-SiAlON formation in Fe3Si-Si3N4-Al2O3 composites

Hai-xia Qin; Yong Li; Li-xiong Bai; Meng-long Long; Wen-dong Xue; Jun-hong Chen

doi:10.1007/s12613-017-1411-8

Volume 24 Issue 3

Mar. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(3): 324-331

Hai-xia Qin, Yong Li, Li-xiong Bai, Meng-long Long, Wen-dong Xue, and Jun-hong Chen, Reaction mechanism for in-situ β-SiAlON formation in Fe₃Si-Si₃N₄-Al₂O₃ composites, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp. 324-331. https://doi.org/10.1007/s12613-017-1411-8

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Hai-xia Qin, Yong Li, Li-xiong Bai, Meng-long Long, Wen-dong Xue, and Jun-hong Chen, Reaction mechanism for in-situ β-SiAlON formation in Fe3Si-Si3N4-Al2O3 composites, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp. 324-331. https://doi.org/10.1007/s12613-017-1411-8

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Research Article

Reaction mechanism for in-situ β-SiAlON formation in Fe₃Si-Si₃N₄-Al₂O₃ composites

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Corresponding author:
Yong Li E-mail: lirefractory@vip.sina.com
Received: 12 June 2016; Revised: 27 September 2016; Accepted: 29 September 2016

Abstract

Abstract

In this work, Fe₃Si-Si₃N₄-Al₂O₃ composites were prepared at 1300℃ in an N₂ atmosphere using fused corundum and tabular alumina particles, Al₂O₃ fine powder, and ferrosilicon nitride (Fe₃Si-Si₃N₄) as raw materials and thermosetting phenolic resin as a binder. The effect of ferrosilicon nitride with different concentrations (0wt%, 5wt%, 10wt%, 15wt%, 20wt%, and 25wt%) on the properties of Fe₃Si-Si₃N₄-Al₂O₃ composites was investigated. The results show that the apparent porosity varies between 10.3% and 17.3%, the bulk density varies from 2.94 g/cm³ and 3.30 g/cm³, and the cold crushing strength ranges from 67 MPa to 93 MPa. Under the experimental conditions, ferrosilicon nitride, whose content decreases substantially, is unstable; part of the ferrosilicon nitride is converted into Fe₂C, whereas the remainder is retained, eventually forming the ferrosilicon alloy. Thermodynamic assessment of the Si₅AlON₇ indicated that the ferrosilicon alloy accelerated the reactions between Si₃N₄ and α-Al₂O₃ fine powder and that Si in the ferrosilicon alloy was nitrided directly, forming β-SiAlON simultaneously. In addition, fused corundum did not react directly with Si₃N₄ because of its low reactivity.
- alumina;
- ferrosilicon nitride;
- SiAlON;
- liquid sintering;
- reaction mechanisins

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