Coated gas turbine engine compressor components
AssigneeUnited Technologies Corporation
InventorsDinesh K. Gupta, Melvin Freling
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Abstract
Coated gas turbine engine hardware is described. The hardware comprises a titanium alloy substrate having a coating thereon consisting essentially of titanium nitride wherein the ratio of nitrogen to titanium is greater than one. Such coatings have a residual compressive stress state which aids in minimizing the fatigue debit which would otherwise result from the use of a hard coating on a titanium substrate. Coatings are applied by the use of a vacuum arc deposition process.
Claims5
An erosion resistant coated titanium article having fatigue properties essentially equal to a similar uncoated titanium article which comprises:
- a titanium article having residual compressive surface stresses;
- a titanium nitride surface coating on said article having residual compressive surface stresses in excess of the preexisting titanium residual compressive surface stress.
Dependencies are inferred from the claim text.