Thermal barrier coating system and methods

Details Thermal barrier coating system and methods Thermal barrier coating system and methods

1996-02-07

1998-10-20

Zirker, Daniel

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428632, 428633, 428937, B32B 1500, B32B 1520

Patent

active

058244239

ABSTRACT:
Disclosed is an improved bond coat of a thermal barrier coating system useful for enhancing adhesion of a ceramic topcoat to a superalloy substrate. The bond coat includes about 13 to 30 weight percent aluminum, between trace and about 3 weight percent of a reactive element selected from the group consisting of yttrium, zirconium, lanthanum, and scandium, and mixtures thereof, and balance selected from the group consisting of nickel, cobalt, iron and mixtures thereof, wherein said bond coat is further characterized by absence of added chromium. A preferred method includes plasma spraying a prealloyed powder of the bond coat composition on the substrate followed by alumina formation and ceramic topcoat deposition. Uses include thermal barrier coating systems on gas turbine engine hot section components such as turbine blade and vane airfoils, combustors, and exhaust nozzles.

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