Thermal Joint Resistance of Polymer-Metal Rough Interfaces

[+] Author and Article Information
M. Bahrami, M. M. Yovanovich

Department of Mechanical Engineering,  University of Waterloo, Waterloo, ON, Canada N2L 3G1

E. E. Marotta

Department of Mechanical Engineering,  Texas A&M University, College Station, Texas 77813-3123

J. Electron. Packag 128(1), 23-29 (May 11, 2005) (7 pages) doi:10.1115/1.2159005 History: Received August 21, 2004; Revised May 11, 2005

A compact analytical model is proposed for predicting thermal joint resistance of rough polymer-metal interfaces in a vacuum. The model assumes plastic deformation at microcontacts and joint temperatures less than the polymer’s glassy temperature. The joint resistance includes two components: (i) bulk resistance of the polymer, and (ii) microcontacts resistance, i.e., constriction∕spreading resistance of the microcontacts at the interface. Performing a deformation analysis, it is shown that the deformation mode of surface asperities is plastic for most polymers studied. It is observed that the thermophysical properties of the polymer control the thermal joint resistance and the metallic surface properties have a second order effect on the thermal joint resistance. A new nondimensional parameter, the ratio of microcontacts over bulk thermal resistances, is proposed as a criterion to specify the relative importance of the microcontacts thermal resistance. The present model is compared with more than 140 experimental data points collected for a selected number of polymers. The averaged rms relative difference between the model and data is approximately 12.7%.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Geometry and thermal resistance network. Conforming rough polymer-metal joint in a vacuum.

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Figure 2

Equivalent contact of conforming rough joints

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Figure 3

Comparison between present model and delrin 1. Data collected by (8).

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Figure 4

Comparison between present model and delrin 2. Data collected by (8).

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Figure 5

Comparison between present model and polyethylene. Data collected by (8).

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Figure 6

Comparison between present model and ABS. Data collected by (2).

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Figure 7

Comparison between present model and PVC. Data collected by (2).

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Figure 8

Comparison between nondimensional joint resistance predicted by present model and experimental data collected by (2,8)



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