A Graphite Foams Based Vapor Chamber for Chip Heat Spreading

[+] Author and Article Information
Minhua Lu, Larry Mok

 IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY 10598

R. J. Bezama

 IBM Microelectronics Division, Route 52, Hopewell Junction, NY 12533

J. Electron. Packag 128(4), 427-431 (Nov 15, 2005) (5 pages) doi:10.1115/1.2351908 History: Received September 30, 2005; Revised November 15, 2005

A vapor chamber using high thermal conductivity and permeability graphite foam as a wick has been designed, built, and tested. With ethanol as the working fluid, the vapor chamber has been demonstrated at a heat flux of 80Wcm2. The effects of the capillary limit, the boiling limit, and the thermal resistance in restricting the overall performance of a vapor chamber have been analyzed. Because of the high thermal conductivity of the graphite foams, the modeling results show that the performance of a vapor chamber using a graphite foam is about twice that of one using a copper wick structure. Furthermore, if water is used as the working fluid instead of ethanol, the performance of the vapor chamber will be increased further. Graphite foam vapor chambers with water as the working fluid can be made by treating the graphite foam with an oxygen plasma to improve the wetting of the graphite by the water.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 2

Schematics of the (a) vapor chamber and (b) a picture of finished vapor chamber

Grahic Jump Location
Figure 3

Illustration of the vapor chamber test configuration

Grahic Jump Location
Figure 1

Pressure drop for a 1mm thick POCO graphite foam as a function of fluid velocity

Grahic Jump Location
Figure 4

Thermal resistance of vapor chambers containing different amount of ethanol versus input power

Grahic Jump Location
Figure 5

Capillary limit dependency on working fluid thermal properties versus temperature

Grahic Jump Location
Figure 6

Boiling limit dependency on fluid thermal properties versus temperature

Grahic Jump Location
Figure 7

SEM image of a typical graphite foam (courtesy of J. Klett of Oak Ridge National Lab)



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In