科研之友
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摘要
To study the substitution of Fe3Si-Si3N4 for refractories in the upper RH refiner, this paper simulated the service condition of RH refining and studied the change of the Fe3Si-Si3N4 in the simulated condition. A Fe3Si-Si3N4 specimen prepared by flash combustion was put in a vacuum sintering furnace with carbon lining, fired at 1 450 degrees C under 80 Pa of vacuum degree for 2 h, and then cooled. The morphological evolution before and after being treated and phase interactions of the Fe3Si-Si3N4 specimen were studied and analyzed thermodynamically and dynamically. The results show that at high temperatures in vacuum, Fe volatilizes from the Fe3Si melt in Fe3Si-Si3N4 and reacts with Si3N4 on the Si3N4 crystal surface, forming new Fe),Si melt there; then Fe continues to volatilize from the new FexSi melt, causing FexSi alloy particles finer and more uniform in Fe3Si-Si3N4; the hexagonal columnar Si3N4 crystals begin to decompose partially, and become cylindrical with edges and corners disappearing; during prebaking or operation interval of RH refining, a SiO2 film which has better stability than Si3N4 is developed on the surface of Si3N4 crystals or Fe3Si-Si3N4 bricks, preventing the decomposition of Si3N4 and improving the application feasibility of Fe3Si-Si3N4 in RH refining.
- 出版日期2016
- 单位北京科技大学
