Erosion resistant coating
AssigneeROLLS-ROYCE plc
InventorAndrew Jonathan Leggett
Life of this patent
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Abstract
A platinum plus chromium coating applied to the roots and firtrees of turbine blades where the inclusion of chromium creates a single phase outer zone which minimizes diffusion paths for sulphur which can preferentially diffuse down phase boundaries and enables a chromium rich outer oxide scale to form on top of the coating.
Claims12
An erosion protection coating on a shank and a root of a gas turbine engine turbine blade that is (i) mounted in a root slot of a turbine disc and (ii) comprises an aerofoil, a platform, the shank, and the root, the coating having a single gamma phase outer zone that comprises:
- between 25 to 60 wt % platinum;
- 8 and 20 wt % chromium;
- and
- up to 7.5 wt % aluminium.
An erosion protection coating on a gas turbine engine turbine blade that is mounted in a root slot of a turbine disc, the coating comprising:
- platinum;
- and
- a single gamma phase outer zone
- that comprises between 8 and 30 wt % chromium and up to 7.5 wt % aluminium.
A method of providing a coating on a gas turbine engine nickel turbine blade, the method comprising:
- applying to the blade a coating of platinum,
- heat treating the blade to provide a platinum-enriched outer layer with a thickness between 5 microns and 30 microns,
- diffusing chromium into the platinum to form a single gamma phase outer zone comprising up to 7.5 wt % aluminium, and
- mounting the blade into a root slot of a turbine disc.
Dependencies are inferred from the claim text.