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US 4,303,693 AGranted
Method of applying a ceramic coating to a metal workpiece
AssigneeROLLS-ROYCE plc
InventorRonald W. Driver
Life of this patent
Estimating the term…
Abstract
A method of applying a ceramic coating to a metallic workpiece is proposed in which the workpiece is heated in a range of 500.degree. C. to 950.degree. C. and the coating directly plasma sprayed thereon in an atmosphere of air before the workpiece has formed any considerable oxide skin thereon. In this way the use of the conventional bond coat is avoided, while the amount of tensile stress on the ceramic at working temperature is reduced by the pre-stressing effect thus induced.
Claims8
A method of applying a ceramic coating to a metallic workpiece comprising the steps of:
- heating the metallic workpiece to a temperature in a range of 500.degree. C. to 950.degree. C. with at most a thin and strongly adherent coat of metallic oxide forming on the workpiece;
- and then before a further oxide coating forms on the heated workpiece, immediately plasma spraying the ceramic coating on to the heated workpiece in an atmosphere of air.
Dependencies are inferred from the claim text.