Process for joining, coating or repairing parts made of intermetallic material

摘要

A process for joining two parts of which at least one is made of an intermetallic material comprises: mixing elemental powders to form an intermetallic compound of the same type as that of the intermetallic part or parts; compacting and forming an intermediate part from the said compound at a temperature below that of the reaction sintering temperature of the compound; placing the intermediate part in position between the two parts to be joined; subjecting the assembly of parts to a first thermal cycle so as to effect a reaction sintering of the intermediate part and a consolidation of the assembly; and, subjecting the assembly to a second thermal cycle at a temperature above 0.8 of the fusion temperature of said intermetallic compound so as to effect a diffusion treatment and mechanical consolidation of the assembly. The process may also be adapted to form a coating or a repair of a part using an intermetallic material.