C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/25, 172/8, 1
C21D 8/02 (2006.01) B01J 37/02 (2006.01) B21C 37/02 (2006.01) B23P 17/00 (2006.01)
Patent
CA 1136524
Abstract of the Disclosure 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° C and about 930° 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.
357029
Chapman Lloyd R.
Vigor Charles W.
Watton John F.
General Motors Corporation
Gowling Lafleur Henderson Llp
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