Method of repairing an aluminide coating on an article

Abstract

A method of locally repairing an aluminide coating (50) on a gas turbine engine nozzle guide vane (26) or a turbine blade (30,30B) comprises removing a damaged portion of the aluminide coating (50) from a portion (53) of the surface of the article. Any oxidised layer (54) is removed from the portion (53) of the surface of the article. Stoichiometric amounts of nickel and aluminium are placed on the portion (53) of the surface of the article using at least one foil (57). The stoichiometric amounts of nickel and aluminium are heat treated to form an aluminide patch coating (50B) on the portion (53) of the surface of the article and to bond the aluminide patch coating (50B) to the portion (53) of the surface of the article and to the aluminide coating (50) surrounding the aluminide patch coating (50B). The advantage is that the aluminide coating (50) surrounding the aluminide patch coating (50B) is not over aluminised.

Dependencies are inferred from the claim text.