Thermal barrier coatings

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Reexamination Certificate

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C428S472000, C428S701000, C428S702000, C416S24100B

Reexamination Certificate

active

07740948

ABSTRACT:
This disclosure addresses the issue of providing a metallic-ceramic overlay coating that potentially serves as an interface or bond coat layer to provide enhanced oxidation resistance to the underlying superalloy substrate via the formation of a diffusion barrier regime within the supporting base material. Furthermore, the metallic-ceramic coating is expected to limit the growth of a continuous thermally grown oxide (TGO) layer that has been primarily considered to be the principal cause for failure of existing TBC systems. Compositional compatibility of the metallic-ceramic with traditional yttria-stabilized zirconia (YSZ) top coats is provided to further limit debond or spallation of the coating during operational use. A metallic-ceramic architecture is disclosed wherein enhanced oxidation resistance is imparted to the surface of nickel-based superalloy or single crystal metal substrate, with simultaneous integration of the yttria stabilized zirconia (YSZ) within the metallic-ceramic overlayer.

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M. Kamaraj,Rafting in Single Crystal Nickel-Base Superalloys, An Overview, Sadhana, vol. 28. Parts 1&2, Feb./Apr. 2003, pp. 115-128.

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