Formation of Interface Layers between Corundum‐Based Refractory Ceramics with Carbon Additions and Molten 42CrMo4 Steel

The formation of reaction layers between corundum‐based (Al 2 O 3 + C) filter materials covered with functional Al C coatings having different carbon contents and molten steel 42CrMo4 is investigated at the temperature 1600 °C. Within first 60 s, an amorphous layer formed interface original surface steel. This consists mainly Fe small, varying amounts Si. After a longer contact time (120 s), nanocrystalline phases, which are identified as iron‐based oxides, within this interlayer. 5 min, replaced by dense corundum layer, on thin platelets attached. its transformation to corundum, effect content in coating nucleation growth discussed. experiments carried out spark plasma sintering device avoid liquid metal convection immersion tests casting simulator obtain relevant information about filtering process.