Resistance to Molten Superalloy at 1550 °C for Molybdenum Metal Core with a Silica/Silicide Coating

This work designs a silica (SiO2) layer on molybdenum metal core to provide new insights the corrosion resistance of silica/silicide coating in Ni-based superalloy. The substrate coated with MoSi2 by pack cementation was pre-oxidized fabricate cristobalite scale surface and preoxidation specimens were chosen examine corrosion-resistant property using DSM11 superalloy at 1550 °C. In order prepare layer, microstructure evolution 40- µm different oxidation parameters (temperature time) investigated. After casting test, results showed that silicide dissolved molten However, matrix found be protected as well accompanied partially destroyed core/superalloy interfaces. Furthermore, reason for destruction analyzed. failure mechanism proposed during cast process.