Metallic article having a protective coating and a method of applying a protective coating to a metallic article
AssigneeROLLS-ROYCE plc
InventorDavid Bettridge
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Abstract
A metallic turbine blade (10) has a protective coating (22) applied to the shank (16) and the root (18) of the turbine blade (10). The protective coating (22) comprises a chromized coating (24) diffused into the surface of the metallic article (10) and a glass coating (26) on the chromized coating (24). The glass coating (26) comprises a silicate glass, preferably having a chromium oxide filler. The glass coating (26) preferably comprises a boron titanate silicate glass having a chromium oxide filler. The protective coating (22) provides oxidation and sulphidation resistance for the shank (16) and root (18) of the turbine blade (10).
Claims9
A metallic article having a protective coating on the metallic article, the protective coating comprising a chromised coating on the metallic article and a glass coating on the chromised coating, the glass coating comprising a silicate glass having a chromium oxide filler.
A metallic article having a protective coating on the metallic article, the metallic article comprising a turbine blade, the turbine blade having a root, a shank, a platform and an aerofoil, the aerofoil having internal cooling passages and an external surface, a first protective coating on at least one of the root, the shank and the internal cooling passages of the aerofoil, a second protective coating, different from said first protective coating, on at least one of the platform and the external surface of the aerofoil, the first protective coating comprising a chromium coating diffused into the metallic article and a glass coating on the chromium coating, the glass coating comprising a silicate glass having a chromium oxide filler.
Dependencies are inferred from the claim text.