Abstract
A new type of thermal barrier coating (TBC) based on metal-glass composite (MGC) has been recently presented. Beside the availability of conventional manufacturing routes of the coating, e.g. by vacuum plasma spraying (VPS) or slip casting, there are two main advantages of the new TBC: The thermal expansion coefficient can be easily adjusted to the substrate by changing the metal to glass ratio of the composite and the severe oxidation of the bondcoat layer can be reduced due to the gastightness of the glassy phase. Nevertheless, oxidation of the metal phases cannot be fully suppressed up to now. Concepts for a multilayer system and an improved oxidation resistance of a MGC based on suitable heat treatments and on alternative glass compositions have been developed. Results from isothermal oxidation experiments and from thermal cycling in burner rig facilities will be discussed.
