| abstract |
A PROCESS FOR FORMING DIFFUSION ALUMINIDE COATINGS ON AN UNCOATED SURFACE OF A SUBSTRATE, WITHOUT INTERDIFFUSING A SUFFICIENT AMOUNT OF ALUMINUM INTO A COATING LAYER TO ADVERSELY AFFECT THE COATING GROWTH POTENTIAL AND MECHANICAL PROPERTIES OF SAID COATING LAYER. A METAL SUBSTRATE IS PROVIDED COMPRISING AN EXTERNAL SURFACE AND AN INTERNAL PASSAGE THEREIN DEFINED BY AN INTERNAL SURFACE, AT LEAST A PORTION OF THE EXTERNAL SURFACE OF THE SUBSTRATE BEING COATED WITH A COATING LAYER SELECTED FROM THE GROUP CONSISTING OF -NIAI-BASE, MCRAIX, A LINE-OF-SIGHT DIFFUSION ALUMINIDE, A NON-LINE-OF-SIGHT DIFFUSION ALUMINIDE, A PACK DIFFUSION ALUMINIDE, AND A SLURRY DIFFUSION ALUMINIDE ON SAID SUBSTRATE. THE METAL SUBSTRATE IS SUBJECTED TO AN ALUMINUM VAPOR PHASE DEPOSITION PROCESS. |