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Filtration Efficiency of Functionalized Ceramic Foam Filters for Aluminum Melt Filtration

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Abstract

The influence of filter surface chemistry on the filtration efficiency of cast aluminum alloys was evaluated for four different filter coating compositions (Al2O3—alumina, MgAl2O4—spinel, 3Al2O3·2SiO2—mullite, and TiO2—rutile). The tests were conducted on a laboratory scale with a filtration pilot plant, which facilitates long-term filtration tests (40 to 76 minutes). This test set-up allows the simultaneous use of two LiMCAs (before and after the filter) for the determination of the efficiency of inclusion removal. The four tested filter surface chemistries exhibited good thermal stability and mechanical robustness after 750 kg of molten aluminum had been cast. All four filter types exhibited a mean filtration efficiency of at least 80 pct. However, differences were also observed. The highest filtration efficiencies were obtained with alumina- and spinel-coated filter surfaces (>90 pct), and the complete removal of the largest inclusions (>90 µm) was observed. The efficiency was slightly lower with mullite- and rutile-coated filter surfaces, in particular for large inclusions. These observations are discussed in relation to the properties of the filters, in particular in terms of, for example, the surface roughness.

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Acknowledgments

The authors would like to thank the German Research Foundation (DFG) for supporting these investigations in terms of the Collaborative Research Centre 920 “Multi-Functional Filters for Metal Melt Filtration—A Contribution towards Zero Defect Materials,” Subprojects A02, S03, A03, and A06. The authors also would like to acknowledge the support of G. Schmidt and J. Hubálková (S01).

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    Authors and Affiliations

    1. Institute of Ceramic, Glass and Construction Materials, Technical University Bergakademie Freiberg, Agricolastr. 17, 09599, Freiberg, Germany

      Claudia Voigt & Christos G. Aneziris

    2. Institute of Foundry Technology, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Straße 4, 09599, Freiberg, Germany

      Eva Jäckel

    3. Constellium C-Tec, 725 rue Aristide Bergès, 38341, Voreppe Cédex, France

      Fabio Taina & Pierre Le Brun

    4. Institute of Material Science, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Straße 5, 09599, Freiberg, Germany

      Tilo Zienert & Anton Salomon

    5. Department of Foundry Technology, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Straße 4, 09599, Freiberg, Germany

      Gotthard Wolf

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    1. Claudia Voigt
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    Correspondence to Claudia Voigt or Eva Jäckel.

    Additional information

    Claudia Voigt and Eva Jäckel have equally contributed.

    Manuscript submitted May 22, 2015.

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    Voigt, C., Jäckel, E., Taina, F. et al. Filtration Efficiency of Functionalized Ceramic Foam Filters for Aluminum Melt Filtration. Metall Mater Trans B 48, 497–505 (2017). https://doi.org/10.1007/s11663-016-0869-5

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    • DOI: https://doi.org/10.1007/s11663-016-0869-5

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