Patent ID: 7378134

Claim:
A method of forming a combustion gas corrosion-resistant film, comprising: preparing film-forming fine powders of mean particle diameter of 0.1-5 μm, said fine powders are of at least one selected from (I) Al, Cr, Si, (II) Re, W, Ta, Mo, Mb, (III) Y, La, Ce, (IV) Pt, Rh, Ir, Ru, (V) Al 2 O 3 , SiC, (VI) NiAl intermetallic compound; preparing a target member capable of being heated by an electric current heating process, said target member made of a heat resistant material selected from the group of Ni, Co, Fe, Pt, Ir, Rh, and conductive ceramics; placing a container containing said fine powders and said target member in a controlled atmosphere; floating said fine powders; heating said target member by the electric current heating process so as to generate vapor of said fine powders by the heating to have the vapor hit a surface of said target member and diffuse into said target member from said surface thereby forming a diffusion film layer, and so as to have said floated fine powders to attach onto said surface thereby forming a fine-powder film layer on said diffusion film layer, wherein said diffusion film layer and said fine-powder film layer forms a dual-film layer structure.