Method of protecting metal parts of turbomachines having holes and cavities by aluminizing the parts

摘要

At least one gaseous precursor of the deposit to be made comprising an aluminum compound is brought by means of a carrier gas into contact with the surfaces of the part which is placed inside an enclosure. The carrier gas is selected from helium and argon and the pressure inside the enclosure is selected in such a manner that the mean free path of the carrier gas molecules is at least twice as long as that of argon molecules under atmospheric pressure. The method is suitable in particular for aluminizing gas turbine blades that have internal holes and cavities.