Journal of Smart Processing
Online ISSN : 2187-1337
Print ISSN : 2186-702X
ISSN-L : 2186-702X
Cross-Sectional Observation of Aluminum/Thermal Conductive Grease/Copper under Pressure
Yasuhiro TAKATANIYoriko MATSUOKAKousuke KITAZUMIMegumi SASAKIHiromitsu TANAKA
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2023 Volume 12 Issue 6 Pages 345-349

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Abstract
 To study the relationship between struct ure and thermal conductivity of thermal conductive grease, it is essential to evaluate the structure under pressure, which is the actual use environment. However, evaluating the cross-sectional shape under pressure is difficult as grease is in a semi-fluid state. In this study, a novel method of preparing and observing a cross-section of thermal conductive grease under pressure has been developed using a focused ion beam-scanning electron microscope. An aluminum foil/ grease/copper plate was pressurized with a vise, and the sample including the vise was immersed in liquid nitrogen to freeze and fix the structure. Results indicated that the thickness of grease and the distribution of thermal conductive particles in the grease could be quantitatively evaluated by this method. We found that the packing ratio of thermal conductive parti cles in the grease under pressure remained consistently high, similar to the level before pressurization.
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© 2023 Smart Processing Society for Materials, Environment & Energy
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