Abstract
In order to explore the influence of nano-sized materials on steel filtration, carbon-bonded alumina filters are coated with multi-walled carbon nanotubes and alumina nanosheets. The samples are tested for different times in contact with a steel melt containing endogenous inclusions at 1650 °C. Investigations of the filters after the test reveal the typical layer buildup described in the literature. After 60 s fine endogenous inclusions are found on the top layer. By means of a special automatic SEM, steel samples after the tests are thoroughly analyzed. The population of detected inclusions is classified in terms of size and chemistry. Nano-coated filters show excellent filtration efficiency for 10 s immersion time. Longer times result in worse performance and generation of new silicate inclusions.
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