FAILURE MECHANISMS ASSOCIATED WITH THE THERMALLY GROWN OXIDE IN PLASMA-SPRAYED THERMAL BARRIER COATINGS

摘要

The microstructure and durability of a thermal barrier coating(TBC)produced by the thermal spray method have been characterized. Upon exposure, the bond coat chemistry and microstructure change by inter-diffusion with the substrate and upon thickening of the thermally grown oxide(TGO). A wedge impression test, in conjunction with observations by scanning electron microscopy, has been used to probe the failure mechanisms.