NDLI: Synthesis of Sialon-SiC Composites from Kyanite Tailings by Carbothermal Reduction Nitridation

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Synthesis of Sialon-SiC Composites from Kyanite Tailings by Carbothermal Reduction Nitridation

Content Provider	Springer Nature Link
Author	Min, Xin Fang, Minghao Huang, Zhaohui Jin, Gaofeng Liu, Yan’gai Tang, Chao Wu, Xiaowen Zhang, Hongxin Guo, Zhenxu
Copyright Year	2015
Abstract	Sialon-SiC composites were synthesized from kyanite tailings via the carbothermal reduction nitridation (CRN) technique. The phase composition, morphology, and microstructure of the CRN samples were investigated by x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, and elected-area electron diffraction. A brief discussion on the synthesis mechanism of CRN process was investigated based on the thermodynamic analysis of the SiO$_{2}$-Al$_{2}$O$_{3}$-C-N$_{2}$ system. The results show the phase compositions depended on the synthesis temperature. With the increasing heating temperature, SiO$_{2}$ was first changed into Si$_{2}$N$_{2}$O and then transformed into Si$_{3}$Al$_{3}$O$_{3}$N$_{5}$ through reacting with N$_{2}$, Al$_{2}$O$_{3}$, and C. At the same time, the excess SiO$_{2}$ changed into SiC by a carbothermal reduction reaction. The optimized synthesis temperature for the CRN reaction was found to be at 1550°C for 4 h. The Si$_{3}$Al$_{3}$O$_{3}$N$_{5}$ and SiC phases were proved coexisting in the same CRN particle. This transformation provided a feasible utilization route of kyanite tailings for high-temperature application.
Starting Page	1379
Ending Page	1384
Page Count	6
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	67
Issue Number	6
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2015-04-29
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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