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Charging characteristics of alumina in molten aluminum

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Abstract

The charging characteristics of alumina particles suspended in a molten aluminum was experimentally determined by measuring a potential difference between the cathode of molten aluminum and the anode of molten aluminum containing alumina particles. The potential difference could be successfully measured by means of differential potential analysis. Experimental results show that alumina carries a positive charge by providing quasi-free electrons to the molten aluminum. Thus, the electrification of alumina in the molten aluminum could be indirectly determined by measuring the potential difference hetween two electrodes. The potential differences measured were in the range of 0.010 to 0.05m V, and increaseu as the purity of the alumina improved, and also as the amount of alumina auued to the molten aluminum increased. It is also interesting to note that the potential difference was appreciably increased by doping alumina with silica. whereas it was decreased by doping alumina with lithia.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Korea University, 5-1 Anam-dong, 36-70 I, Sungbuk-ku, Seoul, Korea

    Young Hyun Paik & Jung Moon Lee

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  1. Young Hyun Paik
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  2. Jung Moon Lee
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Paik, Y.H., Lee, J.M. Charging characteristics of alumina in molten aluminum. Metals and Materials 5, 345–349 (1999). https://doi.org/10.1007/BF03187756

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  • DOI: https://doi.org/10.1007/BF03187756

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