Preparation of Si2N2O from Flashing Combustion Synthesized Si3N4 and Silica Fume
- DOI
- 10.2991/ipemec-15.2015.151How to use a DOI?
- Keywords
- Silica fume; Si2N2O; Flashing combustion synthesis; Melting liquid
- Abstract
Using flashing combustion synthesized Si3N4 and silica fume as raw materials, the effects of firing temperature (1300°C, 1400°C, 1500°C, and 1600°C) and duration (3h, 6h, and 9h) on the synthesis of Si2N2O were studied. The results show that the main mechanism of the reaction is Si3N4 and silica fume react to form Si2N2O through solid-solid reaction or solid-liquid reaction. After heat treatment at 1300°C, there is a small amount of melting liquid in the system, with a trace of Si2N2O formed. After heat treatment at 1400°C, 1500°C, and 1600°C, there is a large amount of melting liquid in the system, accelerating the formation of Si2N2O slightly. The duration has very little effect on the synthesis reaction. When Si2N2O forms, the oxygen content in the melting liquid decreases, viscosity of the liquid increases, the diffusion of ions in the melting liquid slows, hindering the continuous crystallization of Si2N2O. Thus, a fusing agent or hot pressing is re-quired to introduce more low viscosity liquid for the continuous crystallization of Si2N2O. In addition, silica fume crystallizes obviously at 1300°C and 1400°C.
- Copyright
- © 2015, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - B. Li AU - J.H. Chen AU - M.W. Yan AU - X.P. Li AU - J.L. Sun AU - Y. Li AU - M. Wei PY - 2015/05 DA - 2015/05 TI - Preparation of Si2N2O from Flashing Combustion Synthesized Si3N4 and Silica Fume BT - Proceedings of the 2015 International Power, Electronics and Materials Engineering Conference PB - Atlantis Press SP - 814 EP - 820 SN - 2352-5401 UR - https://doi.org/10.2991/ipemec-15.2015.151 DO - 10.2991/ipemec-15.2015.151 ID - Li2015/05 ER -