Diamond composite heat spreader having thermal conductivity gradients and associated methods
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United States of America Patent
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Jun 10, 2008
Grant Date -
Nov 10, 2005
app pub date -
Jul 12, 2005
filing date -
Oct 11, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diamond composite heat spreader having a variable thermal conductivity gradient can improve control of heat transfer based on a specific application. A diamond-containing region of the heat spreader can contain diamond particles such that the diamond concentration and/or the diamond particle size a varied to produce a desired thermal conductivity gradient. Regions proximate to a heat source can have a higher thermal conductivity than regions further away from the heat source. Thin diamond films can also be used in conjunction with the particulate diamond in order to provide a region of maximum thermal conductivity adjacent a heat source. By providing a variable thermal conductivity gradient, more expensive materials such as diamond film and larger diamond particles can be selectively used in regions closer to a heat source, while allowing for cheaper smaller diamond particles and materials to be used farther away from the heat source where thermal conductivity can be lower without sacrificing overall performance.
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