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Residual Properties of Carbon‐Bonded Alumina Foam Filter Coated with Carbon‐Containing Calcium Aluminate after Contact with Steel Melt

Carbon‐bonded alumina (Al2O3‐C) foam filters with a carbon‐containing calcium dialuminate/hexaluminate coating are immersed into steel melt under argon atmosphere. To determine the residual thermomechanical properties of the filter materials, compression tests are conducted after the immersion tests at 1100 and 1500 °C under argon atmosphere using a high‐temperature testing machine. Even after the thermoshock, the materials exhibit brittle and ductile behavior at 1100 and 1500 °C, respectively, with considerable compression strengths. The open porosity and carbon content of the materials do not change significantly after contact with liquid steel. Furthermore, microstructural analysis is performed by scanning electron microscopy, and elemental distribution is examined by energy dispersive X‐ray spectrometry. These clearly show the coating layer as well as some steel droplets. Overall, this study gives the evidence that even after contact with steel melt at ≈1650 °C for 10 s, the thermomechanical behavior, open porosity, pore size distribution, and carbon content of the filter materials are not significantly influenced.