Method of forming aluminide diffusion coatings

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 16/12 (2006.01) C23C 10/28 (2006.01) C23C 16/00 (2006.01) C23C 16/34 (2006.01) C23C 16/455 (2006.01) C23C 28/00 (2006.01) C23C 16/40 (2006.01)

Patent

CA 2482398

Method of forming an outwardly grown aluminide diffusion coating on a superalloy substrate disposed in a coating retort including the steps of heating the substrate to a temperature of 900 to 1200 degrees C, flowing a coating gas comprising aluminum trichloride and a carrier gas through the coating retort at a flow rate of the coating gas of about 100 to about 450 standard cubic feet per hour, providing a concentration of aluminum trichloride in the retort of less than 1.4% by volume of the coating gas, and providing a total pressure of the coating gas in the coating retort of about 100 to about 450 Torr.

Méthode de formation d'un revêtement par diffusion d'aluminure avec croissance vers l'extérieur sur un superalliage placé dans une cornue pour revêtement. Cette méthode comprend les étapes suivantes : chauffage du substrat à une température de 900-1200 oC, circulation d'un gaz de revêtement contenant du trichlorure d'aluminium et un gaz vecteur dans la cornue de revêtement avec un débit d'environ 100 à 450 pieds cubes standard par heure, fournissant une concentration en trichlorure d'aluminium dans la cornue de moins de 1,4 % en volume de gaz de revêtement et une pression totale du gaz de revêtement dans la cornue d'environ 100 à environ 450 torrs.

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