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US 4,861,618 AGranted
Thermal barrier coating system
AssigneeUnited Technologies Corporation
InventorsRaymond W. Vine, Keith D. Sheffler, Charles E. Bevan
Life of this patent
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Abstract
A thermal barrier coating system for the protection of nickel and cobalt base superalloys at elevated temperature comprises 7% yttria partially stabilized zirconia plasma sprayed in air on a plasma sprayed NiCoCrAlY bond coat which has been plasma sprayed in air.
Claims1
A method of applying a durable thermal barrier coating to a metallic substrate including the steps of
- a) providing a clean substrate surface
- b) depositing a metallic bond coat having a composition consisting of 15-40%Cr, 6-15%Al, 0-2%Hf, 0-7%Si, 0.01-1.0%Y bal essentially Ni by plasma deposition in air to a thickness of 0.005-0.015 in.
- c) depositing a ceramic coating of zirconia stabilized with 6-8wt% yttria by plasma deposition in air to a thickness of 0.010-0.015 in.
Dependencies are inferred from the claim text.