Abstract
Understanding the reactions that take place at the interface between ceramic foam filters and metal melts allows to develop better filtration solutions and improve the purity of cast metal products. In particular, the mechanism of interaction between carbon-bonded alumina and steel melts is not well understood yet. In this contribution, the thin secondary layer generated on a carbon-bonded alumina filter during immersion in a steel melt was carefully prepared by focused ion beam and analyzed by scanning electron microscopy combined with energy-dispersive X-ray spectroscopy and electron diffraction. The results showed a concentration gradient of Al and O through the thickness of the layer, suggesting a diffusion mechanism from the filter to the liquid phase during the immersion. Despite the variable composition of this layer, only the crystal structure typical of corundum was detected.
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