The effect of segregants on the oxidation of the bond layer FeCrAl

摘要

The performance of thermal barrier coatings is determined predominantly by the behavior of the 1 μm thick oxide scale, formed beneath the zirconia layer. Several factors may affect the cracking behavior of that interface. These factors include the composition of the alloy substrate and the coatings as well as thermal stresses. Studies by advanced transmission electron microscopy (TEM) techniques reveal the microstructure, composition and bonding at the interfaces and regions close to interfaces in that area. The results will be reported and discussed using different models which are required for an explanation of the failure behavior. Segregation to the interface between the bond coat and the oxide scale and formation of stresses in the scale are expected to play a major role.