Process for protecting the surface of a substrate of intermetallic alloy with a titanium aluminide base against corrosion
AssigneeONERA (Office National d'Etudes et de Recherches Aerospatiales)
InventorsMarie-Pierre Bacos, Pierre Josso
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Abstract
The method according to the invention comprises the following operations: a) prepare a substrated formed of the said intermetallic alloy; b) deposit a coating of gold on the surface to be protected of the substrate; and c) subject the substrate thus equipped with the gold coating to annealing in controlled conditions in order to bring about limited diffusion of the gold into the surface to be protected. The invention is applicable in particular to parts of gas turbines, e.g. parts of aircraft engines.
Claims17
A process for protecting a surface of a substrate of intermetallic alloy with a base of titanium aluminide against corrosion, characterised in that it comprises:
- a) preparing a substrate formed of said intermetallic alloy;
- b) depositing a coating of gold on the surface of the substrate to be protected;
- and
- c) subjecting the substrate so equipped with the gold coating to annealing in controlled conditions to bring about a controlled diffusion of the gold into the surface to be protected against corrosion wherein said surface becomes an exposed surface comprising titanium, aluminide, and gold as a ternary phase.
A process for protecting a surface of a substrate of intermetallic alloy with a base of titanium aluminide against corrosion, characterised in that it comprises:
- a) preparing a substrate formed of said intermetallic alloy;
- b) depositing a coating of gold on the surface of the substrate to be protected;
- and
- c) subjecting the substrate so equipped with the gold coating to annealing under a vacuum at a temperature of between 850° C. and 1050° C. to bring about at least a limited diffusion of the gold into the surface to be protected against corrosion, wherein said surface becomes an exposed surface comprising titanium, aluminide, and gold as a ternary phase.
Dependencies are inferred from the claim text.