Method of preparing a metal substrate for use in a catalytic converter
AssigneeMatthey Bishop, Inc.
InventorsGregory J. Rosenberger, Louis Peters
Life of this patent
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Abstract
Metallic bodies having discontinuously contacting sheet surfaces such as convolute-wound corrugated/non-corrugated metal sheet auto catalyst supports having metal-to-metal diffusion bonds formed at the contacting surfaces are provided. The diffusion bonds formed at the contacting surfaces are provided. The diffusion bonds are produced by heating the body in a non-oxidizing atmosphere, whereby metal from one surface diffuses into the metal from an adjacent surface. Some bonds may also be formed by welding. The bond-formation step may be performed in tandem with a subsequent step of oxidizing the sheet surfaces where they are not bonded, e.g. for making them into a more effectively-adhesive substrate for the catalyst they are to bear.
Claims7
A method of preparing a metal substrate for use in a catalytic converter which comprises assembling together alternating layers of corrugated and non-corrugated sheets of metal alloy including aluminum as an alloy component so as to form an assembly wherein the layers have alternating areas of contact and non-contact;
- and heating the assembly in an oven under a hydrogen atmosphere at a pressure of from about 0.5 to 5 micro-atmospheres and a temperature in the range of about 1000.degree. C. to about 1200.degree. C. until the layers are bonded together by metal-to-metal diffusion bonding at the points where the flat and corrugated sheets are in contact.
Dependencies are inferred from the claim text.