Patent ID: 8609185

Claim:
A method of locally repairing an aluminide coating on an article comprising the steps of: a) removing a damaged portion of an aluminide coating from a portion of the article, b) removing any oxidised layer from the portion of the article, c) placing stoichiometric amounts of at least nickel and aluminium on the portion of the article, and d) heat treating the stoichiometric amounts of at least nickel and aluminium to form an aluminide patch coating on the portion of the article and to bond the aluminide patch coating to the portion of the article and to the aluminide coating adjacent to the aluminide patch coating, wherein step d) comprises locally heat treating the stoichiometric amounts of at least nickel and aluminium to form an aluminide patch coating on the portion of the article and to bond the aluminide patch coating to the portion of the article and to the aluminide coating adjacent to the aluminide patch coating and locally heat treating comprises providing an enclosure which extends over the portion of the article, the enclosure comprising nozzles directing hot gas jets onto the portion of the article to form the aluminide patch coating and to bond the aluminide patch coating to the portion of the article and to the aluminide coating adjacent to the aluminide patch coating.