Experimental and Numerical Study of Ceramic Foam Filtration

Laé, E.; Duval, Hervé; Riviere, C.; Brun, Pierre Le; Guillot, J.-B.

doi:10.1007/978-3-319-48228-6_34

Cited by 9 publications

References 5 publications

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Aluminium Filtration by Bonded Particle Filters

et al. 2019

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Non-metallic inclusions such as oxides, borides and carbides in aluminium melts are a major cause of product failure during both processing and use. To remove these inclusions, molten aluminium is usually filtered through a mechanical filter such as deep bed-filter, ceramic foam filter or Bonded Particle Filter (BPF). In this study three BPF from Pyrotek have been tested at Hydro's reference centre in Sunndalsøra. The filters had different grit sizes; 6, 10, and 14 (equivalent to 30, 50, and 70 ppi). The filters were mounted in the patent pending Drain Free filter box developed by Hycast. LiMCA was used at the upstream side of the two coarsest filter (Grit 6 and 10) and both upstream and downstream for the finest filter (Grit 14). Three samples from each of the filters have been studied in a light microscope, and inclusions have been counted using image analysis. In addition, PoDFA samples from the test with the finest filter were also analysed and discussed.

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Aluminium Filtration by Bonded Particle Filters

et al. 2019

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Ceramic Filter Materials and Filter Structures with Active and Reactive Functional Pores for the Aluminum Melt Filtration

Voigt,

Wetzig,

Hubálková

et al. 2024

Springer Series in Materials Science

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The application of ceramic foam filters is state of the art in the casting of aluminum melt. Despite their industrial use since the 1960s, the filtration mechanisms are not fully understood. The Collaborative Research Center 920 investigated the influence of the filter surface chemistry and wetting between filter and melt on the filtration efficiency. The investigated filter surfaces based on Al2O3, MgAl2O4, 3Al2O3·2SiO2and TiO2 showed differences in the filtration efficiency and the wetting behavior whereby a good correlation for inclusions smaller than 110 µm was found–the larger the contact angle the higher the filtration efficiency. The results raised the question whether the intrinsic contact angle or the different roughness of the materials caused the changes in the filtration efficiency. A filtration trial at the Hydro pilot filtration line revealed a strong influence of the filter surface roughness on the filtration efficiency. A filter coated with Nano-Al2O3, with a divergent intrinsic contact angle compared to be Al2O3 reference filter, showed no improvement of the filtration behavior indicating no influence of the intrinsic contact angle on the filtration.

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