Process of masking cooling holes of a gas turbine component

Details Process of masking cooling holes of a gas turbine component Process of masking cooling holes of a gas turbine component

C - Chemistry, Metallurgy

23

C

C23C 4/00 (2006.01) C23C 10/04 (2006.01) C23C 14/04 (2006.01) C23C 16/04 (2006.01)

Patent

CA 2486590

Process of masking cooling holes (4) of a gas turbine component (1) with an external surface (6), comprising a cavity (2) and a plurality of cooling holes (4) before coating the gas turbine component (1), comprising the steps of first applying a mask material (5) to the cooling holes (4) so that the cooling holes are filled at least closest to the external surface (6), whereby the mask material (5) contains a substance which fluoresces under ultraviolet light and a filler material. Then the mask material (5) within the cooling holes (4) is thickening. An inspection using ultraviolet light to locate any unwanted residual mask material (5) on the external surface (6) is carried out and unwanted residual mask material (5) is removed before the coating (8) is applied to the external surface (6) of the component (1) and the masked cooling holes (4). In the end the mask material (5a) is removed from the cooling holes (4).

L'invention concerne un procédé de masquage d'orifices de refroidissement (4) d'un composant (1) de turbine à gaz présentant une surface externe (6), comprenant une cavité (2) et une pluralité d'orifices de refroidissement (4) avant le revêtement du composant (1) de turbine à gaz, consistant à appliquer d'abord une matière de masque (5) sur les orifices de refroidissement (4) de manière qu'ils soient remplis au moins au plus près de la surface externe (6), la matière de masque (5) contenant une substance fluorescente sous l'effet de la lumière ultraviolette et une matière de remplissage. La matière de masque (5) contenue dans les orifices de refroidissement (4) s'épaissit ensuite. Un examen utilisant la lumière ultraviolette afin de localiser toute matière (5) de masque résiduelle indésirable sur la surface externe (6) a lieu et la matière de masque (5) résiduelle indésirable est retirée avant l'application du revêtement (8) sur la surface externe (6) du composant (1) et sur les orifices de refroidissement masqués (4). Finalement, la matière de masque (5a) est retirée des orifices de refroidissement (4).

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