METHOD OF SIMULTANEOUSLY APPLYING THREE DIFFERENT DIFFUSION ALUMINIDE COATINGS TO A SINGLE PART

摘要

A method of simultaneously applying three different diffusion aluminide coatings to a metal part with an external surface and internal passageways includes first placing the part in an enclosed retort. Areas of the part are then coated with aluminum containing slurry for a first diffusion aluminide coating. Interior walls of the retort are then coated with a vapor source slurry for a second vapor phase aluminide coating on the surface of the part. Areas on the surface of the part not requiring coating are coated with masking materials. A closed chamber inside the retort containing source material for a third vapor phase diffusion aluminide coating for the internal passageways is then attached to the internal passageways. The retort is then placed in a furnace under a protective atmosphere and subjected to a diffusion heat treat to coat the external surfaces and internal passageways with the three different aluminide coatings.

主权项

1. A method of simultaneous application of three different diffusion aluminide coatings to a metal part with an external surface and internal passageways, the method comprising:
placing the part in a retort; applying an aluminum containing source slurry for a first diffusion aluminide coating to a first area of the external surface of the part; coating the interior walls of the retort with a vapor phase coating source slurry for a second vapor phase diffusion aluminide coating on a second surface of the part; masking areas not requiring diffusion aluminide coating with masking material; and attaching a closed chamber inside the retort containing source material for a third vapor phase diffusion aluminide coating to the internal passageways of the part.