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- Title
Synthesis of Sialon-SiC Composites from Kyanite Tailings by Carbothermal Reduction Nitridation.
- Authors
Min, Xin; Fang, Minghao; Huang, Zhaohui; Jin, Gaofeng; Liu, Yan'gai; Tang, Chao; Wu, Xiaowen; Zhang, Hongxin; Guo, Zhenxu
- 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-AlO-C-N system. The results show the phase compositions depended on the synthesis temperature. With the increasing heating temperature, SiO was first changed into SiNO and then transformed into SiAlON through reacting with N, AlO, and C. At the same time, the excess SiO 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 SiAlON 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.
- Subjects
SIALON synthesis; CERAMIC materials synthesis; CYANITE; METAL tailings; NITRIDATION
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2015, Vol 67, Issue 6, p1379
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-015-1423-7