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Method for measuring thermal contact resistance of graphite thin film materials.pdf

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Method for measuring thermal contact resistance of graphite thin film materials.pdf

Measurement 93 (2016) 202–207 Contents lists available at ScienceDirect Measurement journal homepage: /locate/measurement Method for measuring thermal contact resistance of graphite thin ?lm materials Xiaogang Li a, Renxi Luo a, Weifang Zhang a, Haitao Liao b,? a School of Reliability and Systems Engineering, Beihang University, Beijing, China b Department of Industrial Engineer, University of Arkansas, Fayetteville, AR, United States article info Article history: Received 18 October 2015 Received in revised form 20 May 2016 Accepted 5 July 2016 Available online 6 July 2016 Keywords: Thermal contact resistance Graphite thin ?lm materials Heat ?ux Interface temperature drop Scanning electron microscope abstract Thermal contact resistance (TCR) is an important parameter in thermal analysis of materials. Because of many in?uential factors, it is dif?cult to ?nd a general model or computational formula to calculate the TCR of a solid interface. In many engineering applications, TCR values are usually obtained through experiments. Unlike extensive research focusing on ordinary columnar materials, this paper aims at measuring the TCR values of graphite thin ?lm materials. The technical challenge is that it is not convenient to embed thermocouples into such materials. To overcome this challenge, a steady-state method using a copper heat ?ux meter is developed, which provides a useful tool for indirect TCR measurement. In our experiments, the TCR values of the graphite thin ?lm materials are successfully measured under different temperature and pressure levels. The results provide a valuable guideline for the use of this type of material in high-temperature, high-pressure applications. ó 2016 Elsevier Ltd. All rights reserved. 1. Introduction Thermal contact resistance (TCR) is used to characterize heat transfer across an interface. Its reciprocal is called thermal contact conductance (TCC). It is an important parameter in thermal analyses of structural components used in a