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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Al2O3-Na3AlF6 Man-Made Ledge Composites for Aluminum Electrolysis Cells
verfasst von : Lv Xiaojun, Zhang Chao, Lai Yanqing, Tian Zhongliang, Jia Ming, Li Jie
Erschienen in: Light Metals 2014
Verlag: Springer International Publishing
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Man-made Al2O3-Na3AlF6 composite ledge for aluminum reduction cell was developed because of the disadvantages of traditional self-forming ledge and the composite material was prepared by pressureless liquid-phase sintering under air atmosphere. The effect of Na3AlF6 mass fraction on the relative density, compressive strength, high-temperature stability and microstructure of Al2O3-Na3AlF6 composites was investigated. The results show that with the increasing of Na3AlF6 mass fraction from 0 to 15 wt%, the relative density increases from 62.05 % to 67.19 %, the compressive strength increases from 9.74 MPa to 17.81 MPa, and the high-temperature stability of composites under 1100 °C gradually becomes worse. However, compared to traditional self-forming ledge, Al2O3-Na3AlF6 composites have more excellent high-temperature stability. Such results indicate that Al2O3-Na3AlF6 composite is a promising man-made ledge for aluminum reduction cell.