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Thermally Conductive Aluminum Treatment

IP.com Disclosure Number: IPCOM000036807D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Covino, CD: AUTHOR [+2]

Abstract

Disclosed is a hard-coat anodize process that achieves a thin anodic film with enhanced thermal conductivity, excellent electrical resistance, even distribution over extreme complex geometric shapes, and is free of significant porosity.

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Thermally Conductive Aluminum Treatment

Disclosed is a hard-coat anodize process that achieves a thin anodic film with enhanced thermal conductivity, excellent electrical resistance, even distribution over extreme complex geometric shapes, and is free of significant porosity.

The basic solution consists of a sulfuric acid bath (18%-20%) by volume that has added to it carbon dioxide and compressed air to produce a steady carbon radical that converts the aluminum surface to a fine grain size aluminum oxide. Anodized film is produced at very low voltage (17.5 volts).

Thermal conductivity is enhanced in several ways using this process. 1. Micro porosity is non-existing, allowing the designer to use a very thin film and still meet

the electrical resistance requirements. 2. This oxide film has the unique ability to penetrate the parent metal two-thirds of the

overall thickness, leaving one-third growth. This

allows the designer to use extremely close

mechanical dimensions to maintain maximum thermal

efficiency between component parts. 3. Extreme uniformity of film on complex geometric shapes allows maximum thermal efficiency due to a

very precise mechanical fit.

Special processing equipment including micro-processing controls have been developed to control this unique process. The purest available chemicals and water having a purity of not less than 5 megohms are used to avoid contamination by absorbing metallics, inorganics, or micro-organisms. Specially designed alum...