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Title: Degradation Characterization of Thermal Interface Greases: Preprint

Abstract

Thermal interface materials (TIMs) are used in power electronics packaging to minimize thermal resistance between the heat generating component and the heat sink. Thermal greases are one such class. The conformability and thin bond line thickness (BLT) of these TIMs can potentially provide low thermal resistance throughout the operation lifetime of a component. However, their performance degrades over time due to pump-out and dry-out during thermal and power cycling. The reliability performance of greases through operational cycling needs to be quantified to develop new materials with superior properties. NREL, in collaboration with DuPont, has performed thermal and reliability characterization of several commercially available thermal greases. Initial bulk and contact thermal resistance of grease samples were measured, and then the thermal degradation that occurred due to pump-out and dry-out during temperature cycling was monitored. The thermal resistances of five different grease materials were evaluated using NREL's steady-state thermal resistance tester based on the ASTM test method D5470. Greases were then applied, utilizing a 2.5 cm x 2.5 cm stencil, between invar and aluminum plates to compare the thermomechanical performance of the materials in a representative test fixture. Scanning Acoustic microscopy, thermal, and compositional analyses were performed periodically during thermal cycling frommore » -40 degrees Celcius to 125 degrees Celcius. Completion of this characterization has allowed for a comprehensive evaluation of thermal greases both for their initial bulk and contact thermal performance, as well as their degradation mechanisms under accelerated thermal cycling conditions.« less

Authors:
 [1];  [1];  [1];  [2];  [2];  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. DuPont Experimental Station
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
DuPont Experimental Station
OSTI Identifier:
1378438
Report Number(s):
NREL/CP-5400-68014
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, 30 May - 2 June 2017, Orlando, Florida
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; thermal interface materials; thermal resistance; thermal conductivity; steady-state technique; greases; silicone; non-silicone

Citation Formats

DeVoto, Douglas J, Major, Joshua, Paret, Paul P, Blackman, G. S., Wong, A., and Meth, J. S.. Degradation Characterization of Thermal Interface Greases: Preprint. United States: N. p., 2017. Web. doi:10.1109/ITHERM.2017.7992501.
DeVoto, Douglas J, Major, Joshua, Paret, Paul P, Blackman, G. S., Wong, A., & Meth, J. S.. Degradation Characterization of Thermal Interface Greases: Preprint. United States. doi:10.1109/ITHERM.2017.7992501.
DeVoto, Douglas J, Major, Joshua, Paret, Paul P, Blackman, G. S., Wong, A., and Meth, J. S.. Thu . "Degradation Characterization of Thermal Interface Greases: Preprint". United States. doi:10.1109/ITHERM.2017.7992501. https://www.osti.gov/servlets/purl/1378438.
@article{osti_1378438,
title = {Degradation Characterization of Thermal Interface Greases: Preprint},
author = {DeVoto, Douglas J and Major, Joshua and Paret, Paul P and Blackman, G. S. and Wong, A. and Meth, J. S.},
abstractNote = {Thermal interface materials (TIMs) are used in power electronics packaging to minimize thermal resistance between the heat generating component and the heat sink. Thermal greases are one such class. The conformability and thin bond line thickness (BLT) of these TIMs can potentially provide low thermal resistance throughout the operation lifetime of a component. However, their performance degrades over time due to pump-out and dry-out during thermal and power cycling. The reliability performance of greases through operational cycling needs to be quantified to develop new materials with superior properties. NREL, in collaboration with DuPont, has performed thermal and reliability characterization of several commercially available thermal greases. Initial bulk and contact thermal resistance of grease samples were measured, and then the thermal degradation that occurred due to pump-out and dry-out during temperature cycling was monitored. The thermal resistances of five different grease materials were evaluated using NREL's steady-state thermal resistance tester based on the ASTM test method D5470. Greases were then applied, utilizing a 2.5 cm x 2.5 cm stencil, between invar and aluminum plates to compare the thermomechanical performance of the materials in a representative test fixture. Scanning Acoustic microscopy, thermal, and compositional analyses were performed periodically during thermal cycling from -40 degrees Celcius to 125 degrees Celcius. Completion of this characterization has allowed for a comprehensive evaluation of thermal greases both for their initial bulk and contact thermal performance, as well as their degradation mechanisms under accelerated thermal cycling conditions.},
doi = {10.1109/ITHERM.2017.7992501},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Aug 03 00:00:00 EDT 2017},
month = {Thu Aug 03 00:00:00 EDT 2017}
}

Conference:
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