Abstract
Particles and inclusions are commonly removed from molten aluminium with the use of Ceramic Foam Filters (CFF). The mechanical properties of CFFs are of great importance not only during transportation, storage, and mounting, ut also in view of securing the integrity of the filters during operation. Data on the compression strength of CFFs at room temperature are available in the literature, but this is not the case for their performance under operating conditions. The main aim of the present study has therefore been to develop an experimental procedure enabling compression testing of CFFs submerged in molten aluminium at operating temperature, i.e. when exposed to actual casthouse conditions. The effect of temperature and holding time was investigated with tests performed at room temperature, at operating temperature with varying duration of filter sample preheating and submerged in molten aluminium. The developed procedure for the measurement of the compression strength for samples submerged in aluminium showed realistic and reproducible data in comparison with previous studies and testing at room temperature. The filter tested was a commercial 30 ppi Al2O3-based CFF, which as expected revealed a significant decrease in compression strength for the filter samples submerged in aluminium. The weakened structure of the ceramic foam is believed to be due to a reaction occurring between the CFF and the molten aluminium. Additionally, the exposed filter samples also exhibited a less brittle behaviour compared to the unexposed samples, indicating that even a softening of the ceramic structure had taken place.
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References
K. Schwartzwalder, H. Somers, A. V. Somers, Method of Making Porous Ceramic Articles, US 3,090,094, 1963.
R. Fritzsch, M.W. Kennedy, J.A. Bakken, R.E. Aune, Electromagnetic Priming of Ceramic Foam Filters (CFF) for Liquid Aluminum Filtration, Light Met. (2013) 973–979. https://doi.org/10.1002/0781118663189.ch165.
M.F. Ashby, Mechanical Properties of Cellular Solids., Metall. Trans. A, Phys. Metall. Mater. Sci. 14 A (1983) 1755–1769. https://doi.org/10.1007/BF02645546.
S. Meille, M. Lombardi, J. Chevalier, L. Montanaro, Mechanical Properties of Porous Ceramics in Compression: On the Transition Between Elastic, Brittle, and Cellular Behavior, J. Eur. Ceram. Soc. 32 (2012) 3959–3967. https://doi.org/10.1016/j.jeurceramsoc.2012.05.006.
C.Q. Dam, R. Brezny, D.J. Green, Compressive Behavior and Deformation-Mode Map of an Open Cell Alumina, J. Mater. Res. 5 (1990) 163–171. https://doi.org/10.1557/JMR.1990.0163.
C. Voigt, J. Storm, M. Abendroth, C.G. Aneziris, M. Kuna, J. Hubálková, The Influence of the Measurement Parameters on the Crushing Strength of Reticulated Ceramic Foams, J. Mater. Res. 28 (2013) 2288–2299.
F.A.C. Oliveira, S. Dias, M.F. Vaz, J.C. Fernandes, Behaviour of Open-Cell Cordierite Foams under Compression, J. Eur. Ceram. Soc. 26 (2006) 179–186. https://doi.org/10.1016/j.jeurceramsoc.2004.10.008.
R. Brezny, D.J. Green, Uniaxial Strength Behavior of Brittle Cellular Materials, J. Am. Ceram. Soc. 76 (1993) 2185–2192. https://doi.org/10.1111/j.1151-2916.1993.tb07753.x.
J. Hubálková, C. Voigt, A. Schmidt, K. Moritz, C.G. Aneziris, Comparative Phenomenological Study of Fracture Behavior of Ceramic and Glass Foams under Compressive Stress Using In Situ X-Ray Microtomography, Adv. Eng. Mater. 19 (2017) 1–9. https://doi.org/10.1002/adem.201700286.
L.J. Gibson, M.F. Ashby, Cellular Solids: Structure and Properties, 2nd ed., Cambridge University Press, Cambridge, UK, 1997.
K.C. Goretta, R. Brezny, C.Q. Dam, D.J. Green, A.R. De Arellano-Lopéz, A. Dominguez-Rodriguez, High Temperature Mechanical Behavior of Porous Open-Cell Al2O3, Mater. Sci. Eng. A. 124 (1990) 151–158. https://doi.org/10.1016/0921-5093(90)90145-S.
W. Acchar, F.B.M. Souza, E.G. Ramalho, W.L. Torquato, Mechanical Characterization of Cellular Ceramics, Mater. Sci. Eng. A. 513–514 (2009) 340–343. https://doi.org/10.1016/j.msea.2009.02.012.
R. Brezny, D.J. Green, Fracture Behavior of Open-Cell Ceramics, J. Am. Ceram. Soc. 72 (1989) 1145–1152.
R. Brezny, D.J. Green, C.Q. Dam, Evaluation of Strut Strength in Open‐Cell Ceramics, J. Am. Ceram. Soc. 72 (1989) 885–889. https://doi.org/10.1111/j.1151-2916.1989.tb06239.x.
R. Brezny, D.J. Green, The Effect of Cell Size on the Mechanical Behavior of Cellular Materials, Acta Metall. Mater. 38 (1990) 2517–2526. https://doi.org/10.1016/0956-7151(90)90263-G.
G. Heness, N. Booth, B. Ben-Nissan, Does Size Matter? - The Effect of Volume on the Compressive Strength of Open Cell Brittle Ceramics, Adv. Mater. Res. 41–42 (2008) 221–226. https://doi.org/10.4028/www.scientific.net/amr.41-42.221.
M.W. Kennedy, S. Akhtar, J.A. Bakken, R.E. Aune, Electromagnetically Modified Filtration of Aluminum Melts Part I: Electromagnetic Theory and 30 PPI Ceramic Foam Filter Experimental Results, Metall. Mater. Trans. B. (2013) 1–15. https://doi.org/10.1007/s11663-013-9798-8.
M.W. Kennedy, S. Akhtar, R. Fritzsch, J.A. Bakken, R.E. Aune, Apparatus and Method for Priming a Molten Metal Filter, US9605332B2, 2013.
G. Chai, L. Baeckerud, L. Arnberg, Study of Dendrite Coherency in Al-Si Alloys During Equiaxed Dendritic Solidification, Zeitschrift Fuer Met. 86 (1995) 54–59.
A. Bergin, C. Voigt, R. Fritzsch, S. Akhtar, L. Arnberg, C.G. Aneziris, R.E. Aune, Experimental Study on the Chemical Stability of Phosphate Bonded Al2O3-based Ceramic Foam Filters (CFFs), Submitt. to Metall. Mater. Trans. B. October (2020).
Acknowledgements
The authors would like to thank the Research Council of Norway (NFR project nr: 284090) and the German Research Foundation (DFG) for supporting these investigations as part of the Collaborative Research Centre 920 “Multi-Functional Filters for Metal Melt Filtration—A Contribution towards Zero Defect Materials” (Project-ID 169148856) subprojects A02. Furthermore, the authors would also like to acknowledge the support of Norsk Hydro ASA and the Department of Materials Science and Engineering at the Norwegian University of Science and Technology. Special thanks are given to Dr. Claudia Voigt for valuable discussions, and Kristoffer Smedal Olsen and Sara Linnea Larsson Grayston for working on this topic in their bachelor’s thesis. Appreciation is also sent to Pyrotek Sivex for supplying the CFFs.
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Bergin, A., Fritzsch, R., Akhtar, S., Arnberg, L., Aune, R.E. (2021). Compression Testing of Ceramic Foam Filters (CFFs) Submerged in Aluminium at Operating Temperature. In: Perander, L. (eds) Light Metals 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65396-5_104
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