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

1996-09-11

1998-09-08

Kastler, Scott

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

427253, 55523, B01D 4600

Patent

active

058039910

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.

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patent: 5505757 (1996-04-01), Ishii
Patent Abstracts of Japan, vol. 14, No. 7 (C-673), Jan. 10, 1990 & JP-A-01 255686 (Sumitomo Electric Ind) Oct. 12, 1989.
Patent Abstracts of Japan, vol 12., No. 318 (E-650), Aug. 29, 1988 & JP-A-63 081767 (Matsushita Electric Ind et al.) Apr. 12, 1988.
Rapp, "The Codeposition of Elements in Diffusion Coatings by the Pack Cementation Method", Materials at High Temperatures, vol. 11, No. 1/4/1993, Jordan Hill, Oxford, GB, pp. 181-184.

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