Corrosion-resistant metallic porous member and method of manufac

Details Corrosion-resistant metallic porous member and method of manufac Corrosion-resistant metallic porous member and method of manufac

1995-06-22

1996-12-10

Silverberg, Sam

Coating processes

Coating by vapor, gas, or smoke

Metal coating

C23C 1600

Patent

active

055828671

ABSTRACT:
In manufacturing a corrosion-resistant metallic porous member having high Cr content by diffusion process in which the material is heat-treated, a plurality of heat cycles are used to achieve uniform Cr content in the thickness direction.
Metallic porous body of Ni, Fe, Ni--Cr or Fe--Cr is buried in a powder of Al, Cr and NH.sub.4 Cl. Inert gas such as Ar and H.sub.2 is introduced and the porous body is heat treated at 800.degree.-1100.degree. C. In the heat treatment, at least two temperature-increase and temperature-decrease steps are included.

REFERENCES:
patent: 3079276 (1963-02-01), Puyear et al.
patent: 3257230 (1966-06-01), Wachtell et al.
Patent abstracts of Japan, vol. 14, No. 7 (C-673), 10 Jan. 1990 & JP-A-01 255686 (Sumitomo Electric Ind) 12 Oct. 1989.
Patent Abstracts of Japan, vol. 12, No. 318 (E-650), 29 Aug. 1988 & JP-A-63 081767 (Matsushita Electric Ind et al.) 12 Apr. 1988.
Rapp, "The Codeposition Of Elements in Diffusion Coatings By The Pack Cementation Method", Materials At High Temperatures, vol. 11, No. Jan. 4, 1993, Jordan Hill, Oxford, GB, pp. 181-184.

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