Enhanced oxide whisker growth on peeled Al-containing stainless

Details Enhanced oxide whisker growth on peeled Al-containing stainless Enhanced oxide whisker growth on peeled Al-containing stainless

1979-11-28

1982-05-25

Shine, W. J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

148 63, 148 315, 252465, 252477R, F01N 310, C23C 1108, B01J 2104, B01J 3502

Patent

active

043316310

ABSTRACT:
In the preferred embodiment, a method is disclosed for preparing a metal foil composed of a ferritic stainless steel alloy and having a surface that is substantially covered by high aspect alumina whiskers. The preferred foil alloy comprises 15 to 25 weight percent Cr, 3 to 6 weight percent Al, 0.3 to 1.0 weight percent Y and the balance Fe. The method comprises forming the foil by a metal peeling process and treating the foil by heating in air at a temperature between about 870.degree. C. and about 930.degree. C. for a time sufficient to grow the alumina whiskers. In a particularly useful embodiment, the whisker-covered foil is coated with a noble metal-impregnated alumina layer and wound into a suitable cylindrical structure for use as a monolith-type catalytic converter for automotive exhaust gas treatment.

REFERENCES:
patent: 3920583 (1975-11-01), Pugh
patent: 3957692 (1976-05-01), Cairns et al.
patent: 3969082 (1976-07-01), Cairns et al.
patent: 4096095 (1978-06-01), Cairns
patent: 4196099 (1980-04-01), Hunter et al.
Tien et al., "Mechanism of Oxide Adherence on Fe-25Cr-4Al (Y or Sc) Alloys", Metallurgical Transactions, vol. 3, Jun. 1972, pp. 1587-1599.

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