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Graphite-Laminated Fins for Improved Heatsink Performance

IP.com Disclosure Number: IPCOM000236985D
Publication Date: 2014-May-23
Document File: 3 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a low-cost method to improve the heat transfer properties of traditional heat sinks by using highly conductive graphite sheet material laminated to aluminum or copper fins.

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Graphite-Laminated Fins for Improved Heatsink Performance

The most common method for cooling electronics components is to apply a combination of a heat sink and fan. This has been accomplished in many different ways. The least expensive (and least effective) heat sinks are typically aluminum extrusions; heat sinks that are more effective may have closely spaced, soldered interlocking fins. In general, the higher the performance requirement, the higher the cost of the cooling method is.

Often, the limiting factor for heat removal is the conductivity of the material used. This is commonly referred to as "spreading resistance". Some methods have been devised to overcome this, primarily heat pipe technology. These highly conductive tubes integrate into the assembly and greatly improve the heat transfer characteristics; however, this solution also adds complexity, cost, and increased air flow resistance.

The novel contribution is a low-cost method to improve the heat transfer properties of traditional heat sinks by using highly conductive graphite sheet material laminated to aluminum or copper fins. It extends the use of less expensive, traditional heat sinks into areas where, normally, expensive material and/or heat pipe technology is required.

Figure 1: Sheet metal laminated to fins

Graphite sheet is already marketed as a heat transfer device, but it is not used in conjunction with another conductive material.

This method is most useful when applied to closely spac...