Process for the production of heat- and corrosion-resistant poro

Details Process for the production of heat- and corrosion-resistant poro Process for the production of heat- and corrosion-resistant poro

1995-06-16

1997-09-30

Silverberg, Sam

Coating processes

Coating by vapor, gas, or smoke

Metal coating

B01D 5300

Patent

active

056723873

ABSTRACT:
A process for the production of a heat- and corrosion-resistant porous metal body which is made of a metal or whose surface layer is made of a metal, in which the porous metal body can be alloyed with chromium or a combination of chromium and aluminum uniformly throughout the entire thereof by adjusting the alloy composition in the following manner, i.e., (A) heat-treating the porous metal body in a mixed gas comprising a gas, generated by heating a powdered mixture comprising chromium or its compound and NH.sub.4 Cl at 950.degree. to 1100.degree. C., and a diluent reducing gas at 800.degree. to 1100.degree. C., or (B) heat-treating the porous metal body in a mixed gas comprising a gas, generated by heating a powdered mixture comprising aluminum or its compound, chromium or its compound and NH.sub.4 X, wherein X is I, F, Cl or Br, at a weight ratio of the chromium or its compound to the aluminum or its compound of 10 to 80 in terms of Cr and Al respectively at 950.degree. to 1100.degree. C., and a diluent reducing gas at 800.degree. to 1100.degree. C.

REFERENCES:
patent: 2257668 (1941-09-01), Becker et al.
patent: 3114961 (1963-12-01), Chambers
patent: 3152007 (1964-10-01), Perrin et al.
patent: 4132816 (1979-01-01), Benden
Gas Plating, Powell, Materials and design Eng. pp. 98-101 Jan. 1960.

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