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Super Heat-Radiating-Efficient Dissipators

IP.com Disclosure Number: IPCOM000036329D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Schrottke, G: AUTHOR [+2]

Abstract

Typically, heat sinks consist of aluminum or aluminum alloys. Thermal coefficients of expansion of these materials are usually significantly different from those of heat-source devices. With the current state of the art, in rigid heat-sink configurations, detrimental stresses at the interface of the heat sink and heat source result, which cause degraded performance and/or reliability.

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Super Heat-Radiating-Efficient Dissipators

Typically, heat sinks consist of aluminum or aluminum alloys. Thermal coefficients of expansion of these materials are usually significantly different from those of heat-source devices. With the current state of the art, in rigid heat-sink configurations, detrimental stresses at the interface of the heat sink and heat source result, which cause degraded performance and/or reliability.

In addition, heat-sink configurations do not maximize the potential surface area available in the allotted volume. Also, these configurations require specific orientation to the air-flow patterns and hence suffer reduced efficiency when the air-flow patterns are not optimum (i.e., machine power in standby mode where forced air is removed, machine power off, etc.). Furthermore, machine and circuit board design is hampered by the heat-sink-orientation requirement.

This article describes the use of high compliance materials with low mass-to- surface area configurations for heat sinks. These materials could take the form of shredded aluminum foil, aluminum mesh or aluminum wool in conjunction with various thermal adhesives to attach it to the heat source. Material can be chosen with high emissivity to maximize heat radiation. The orientation of the material will be random and equally efficient in all directions. In addition, the surface- emitting area can be increased dramatically per given unit volume, adding to heat-sink efficiency.

The mater...