Natural graphite heat spreaders are in use in electronic cooling applications where heat flux density is low. Natural graphite is an anisotropic material, with a high thermal conductivity in the plane of the spreader combined with a much lower thermal conductivity through its thickness. This low through-thickness thermal conductivity poses a problem when attempting to cool heat sources with relatively high heat flux densities. This problem can be overcome by embedding a thermal via in the graphite material. This via is made from an isotropic material with a thermal conductivity significantly higher than the through-thickness graphite conductivity. This paper examines the thermal performance of a natural graphite heat spreader with an embedded thermal via. The work is primarily experimental although numerical models were used to guide the experiments. The thermal performance of these spreaders is compared to that of spreaders made from conventional isotropic materials. The effect of accelerated aging tests on the performance of these graphite spreaders is reviewed. Finally, two applications are examined; first cooling an ASIC module and second, cooling an FB-DIMM memory card.
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ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference
July 8–12, 2007
Vancouver, British Columbia, Canada
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
0-7918-4277-0
PROCEEDINGS PAPER
Thermal Performance of Natural Graphite Heat Spreaders With Embedded Thermal Vias Available to Purchase
Martin Smalc,
Martin Smalc
Advanced Energy Technology, Inc., Parma, OH
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Prathib Skandakumaran,
Prathib Skandakumaran
Advanced Energy Technology, Inc., Parma, OH
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Julian Norley
Julian Norley
Advanced Energy Technology, Inc., Parma, OH
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Martin Smalc
Advanced Energy Technology, Inc., Parma, OH
Prathib Skandakumaran
Advanced Energy Technology, Inc., Parma, OH
Julian Norley
Advanced Energy Technology, Inc., Parma, OH
Paper No:
IPACK2007-33215, pp. 607-617; 11 pages
Published Online:
January 8, 2010
Citation
Smalc, M, Skandakumaran, P, & Norley, J. "Thermal Performance of Natural Graphite Heat Spreaders With Embedded Thermal Vias." Proceedings of the ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASME 2007 InterPACK Conference, Volume 1. Vancouver, British Columbia, Canada. July 8–12, 2007. pp. 607-617. ASME. https://doi.org/10.1115/IPACK2007-33215
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