Laser cladding a turbine engine vane platform

B - Operations – Transporting – 23 – P

Patent

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Details

B23P 15/00 (2006.01) B23K 26/34 (2006.01) B23P 6/00 (2006.01) F01D 5/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2381490

A method of refurbishing turbine engine vanes (2) in which an alloy blend of a cobalt based superalloy and a nickel base superalloy corresponding to the base material of the turbine vane cobalt platform and the base nickel material of the replacement turbine vane airfoils is laser clad to the gaspath surfaces of the turbine vane platform. Laser cladding with the alloy blend allows the use of replacement airfoils with improved castings in the form of improved nickel based superalloys, and allows a coating to be uniformly applied to the gaspath surfaces of the vane. According to the method, the platforms (4, 6) are separated from the airfoils (8, 10) and laser clad with a blend of cobalt based superalloy and nickel based superalloy. The vane is then reassembled using the laser clad platform and at least one replacement airfoil.

La présente invention concerne un procédé permettant de reconditionner des roues d'ailettes (2) de moteur à turbine. En l'occurrence, on regarnit au laser les surfaces d'écoulement des gaz de la plate-forme à ailettes de la turbine en utilisant un mélange d'alliage d'un superalliage au cobalt et d'un superalliage au nickel correspondant au matériau de base au cobalt de la plate-forme d'ailettes de la turbine et au matériau de base du nickel des profils de remplacement des ailettes de la turbine. Le garnissage au laser avec le mélange d'alliage permet, non seulement d'utiliser des profils de remplacement d'une meilleure qualité de moulage sous la forme de superalliages au nickel améliorés, mais également d'appliquer de façon uniforme la garniture sur la surface d'écoulement des gaz de l'ailette. Le procédé consiste à dégager les plates-formes (4, 6) des profils (8, 10) et de les garnir au laser d'un mélange de superalliage au cobalt et d'un superalliage au nickel. Il ne reste plus qu'à remonter la roue d'ailettes en utilisant la plate-forme garnie au laser et au moins un profil de remplacement.

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