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The effect of melt refining upon inclusions in aluminum

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Abstract

A series of aluminum melts has been refined with respect to inclusions by use of ALCOA 469, FILD, or SNIF. The content and size distribution of inclusions in the original-and the refined melts-have been measured by use of neutron activation (oxygen content), gas chromatography (carbide content), sedimentation analysis, and dissolution of metal in hydrochloric acid and subsequent analysis of oxides by means of a Coulter Counter. All the units tested have a beneficial effect and decrease the inclusion content, but the number of analyses are too few to make general conclusions. However, for melts cleaned by use of SNIF, it was found that oxides larger than 50 μm in cross section and borides larger than 20 μm in diameter were removed, while the smaller borides were agglomerated only. The effect of FILD and ALCOA 469 upon the melt tested was removal of borides larger than 5-10 μ m and oxides larger than 15μm in diameter, respectively.

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Authors and Affiliations

  1. Årdal and Sunndal Verk a.s., P.O. Box 51, 6601, Sunndalsöra, Norway

    C. J. Simensen

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  1. C. J. Simensen
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Formerly with Central Institute for Industrial Research, Oslo, Norway

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Simensen, C.J. The effect of melt refining upon inclusions in aluminum. Metall Trans B 13, 31–34 (1982). https://doi.org/10.1007/BF02666952

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  • DOI: https://doi.org/10.1007/BF02666952

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