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New carbon‐bonded filters with coatings based on calcium aluminates are developed. The samples are tested for 10 s in contact with a steel melt containing endogenous inclusions at 1650 °C, in order to explore the behavior and impact of these materials on the filtration process. Investigation of the filters after the test is carried out by optical and scanning electron microscopy. In addition, steel samples are analyzed with a special automatic SEM. The population of the detected inclusions is classified in terms of size and chemistry. Both compositions deliver excellent filtration results.

Dissolution and recovery of Mn-Al compacts with and without a chloride flux was studied by analysing the Mn content of the specimens taken from the melt after the addition of the compact. In the second set of experiments the compacts were heated in a resistance furnace while a thermocouple was in close contact with them and the temperature was recorded. Thermal gravimetric analysis was also carried out to study the oxidation rates of the powder mixtures. The results showed that the intermetallic forming reactions, in the fluxed compacts starts at significantly lower temperatures in comparison with non-fluxed compact. It is concluded that at first the flux removes the oxide layer out of the surfaces of powder particles and leaves behind active surfaces. Afterwards, the exothermic reactions of forming Mn-Al intermetallics start at solid/ solid interfaces at low temperatures, below the melting point of Al.

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