Thermal barrier coating system
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsStephan Stecura, Curt H. Leibert
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Abstract
A coating system which contains a bond coating and a thermal barrier coating is applied to metal surfaces such as turbine blades and which provides both low thermal conductivity and improved adherence when exposed to high temperature gases or liquids. The bond coating contains NiCrAlY and the thermal barrier coating contains a reflective oxide. The reflective oxides ZrO.sub.2 --Y.sub.2 O.sub.3 and ZrO.sub.2 --MgO have demonstrated significant utility in high temperature turbine applications.
Claims8
A coated article of manufacture having a thermal barrier coating system comprising
- a substrate selected from the group consisting of nickel-base alloys and cobalt-base alloys,
- a bond coating consisting essentially of NiCrAlY covering said substrate, and
- a thermal barrier coating consisting essentially of zirconia stabilized with another oxide.
A method of coating surfaces of nickel-base and cobalt-base alloys comprising:
- a. coating said surfaces with a bond coating consisting essentially of NiCrAlY;
- and
- coating the coated surfaces formed in step (a) with a thermal barrier coating consisting essentially of an oxide stabilized zirconia.
Dependencies are inferred from the claim text.