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 minimises 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.
Claims20
An erosion protection coating for a turbine blade, the coating comprising platinum and chromium and having a single gamma phase outer zone.
An erosion protection coating for a turbine blade, the coating comprising platinum and chromium and having a single gamma phase outer zone, wherein the single gamma phase outer zone comprises between 8 and 30 wt % chromium and up to 9 wt % aluminium.
A method of providing a coating on a nickel turbine blade comprising the steps of applying to the blade a coating of platinum, and heat treating to provide a platinum enriched outer layer with a thickness between 5 microns and 30 microns, and diffusing chromium into the platinum to form a single gamma phase outer zone.
Dependencies are inferred from the claim text.