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Functionalization of carbon-bonded alumina filters through the application of active oxide coatings for steel melt filtration

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Abstract

Carbon-bonded alumina filters for steel melt filtration are increasingly used by industries. Their potential regarding the material characteristics and the filtration efficiency appears, however, not used in full measure up to now. In the course of the present work, a new approach, due to the application of active oxide coatings, whose chemical phase equates to that of the nonmetallic oxidic inclusions in the steel melt, was created. The main emphasis consists of the generation of cold-applied, active alumina, spinel, and mullite coatings. Coatings have been developed due to the variation of sintering temperatures and a thermal pretreatment, which lead to increasing cold crushing strength. A basic understanding regarding the adhesion and the interface between the oxide coating and the carbon-bonded filter substrate has been created. Therefore, the essential factor is traceable back to thermal-related mechanisms.

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Acknowledgments

The authors would like to thank the German Research Foundation (DFG) for supporting these investigations through the Collaborative Research Centre 920 “Multi-Functional Filters for Metal Melt Filtration—A Contribution towards Zero Defect Materials”, Subproject A01, Mrs. Jana Hubálková for the CT measurements, and Mr. Gert Schmidt for the SEM images.

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  1. Glass and Construction Materials, Technical University of Freiberg, Institute of Ceramic, 09596, Freiberg, Germany

    Marcus Emmel & Christos G. Aneziris

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  1. Marcus Emmel
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  2. Christos G. Aneziris
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Correspondence to Marcus Emmel.

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Emmel, M., Aneziris, C.G. Functionalization of carbon-bonded alumina filters through the application of active oxide coatings for steel melt filtration. Journal of Materials Research 28, 2234–2242 (2013). https://doi.org/10.1557/jmr.2013.56

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