Measurement of in-plane thermal conductivity of glued graphite film based on thermal imaging

Dexin HOU; Yue CHEN; Shuliang YE

doi:10.11949/0438-1157.20190493

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Measurement of in-plane thermal conductivity of glued graphite film based on thermal imaging

Thermodynamics | 更新时间：2020-06-24

- Measurement of in-plane thermal conductivity of glued graphite film based on thermal imaging
- CIESC Journal Vol. 70, Issue S2, Pages: 76-84(2019)
- 作者机构：
  
  中国计量大学工业与商贸计量技术研究所，浙江杭州 310018
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190493
  CLC： TB 941
- Received：09 May 2019，
  
  Revised：2019-07-11，
  
  Published：05 September 2019
- 稿件说明：
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侯德鑫, 陈玥, 叶树亮. 基于热成像的背胶石墨膜面向热导率测试方法[J]. 化工学报, 2019, 70(S2): 76-84

HOU Dexin, CHEN Yue, YE Shuliang. Measurement of in-plane thermal conductivity of glued graphite film based on thermal imaging[J]. CIESC Journal, 2019, 70(S2): 76-84
侯德鑫, 陈玥, 叶树亮. 基于热成像的背胶石墨膜面向热导率测试方法[J]. 化工学报, 2019, 70(S2): 76-84 DOI： 10.11949/0438-1157.20190493.

HOU Dexin, CHEN Yue, YE Shuliang. Measurement of in-plane thermal conductivity of glued graphite film based on thermal imaging[J]. CIESC Journal, 2019, 70(S2): 76-84 DOI： 10.11949/0438-1157.20190493.

摘要

导热石墨膜广泛用于电子设备中的发热器件散热，面向热导率是反映其传热性能的关键参数，但目前行业中一般只提供裸材数据，无法对背胶石墨膜进行测试，给石墨膜用户的热设计和产品质量管理带来不便。提出一种基于热成像的背胶石墨膜面向热导率稳态测试方法，样品直接黏附于平整台面测试，通过温度梯度环路积分消除热流不均匀的影响，通过热损失标定减小表面换热和旁路传热带来的测试误差。基于多种规格石墨膜产品和具有参考数据的金属薄片进行实验，结果证明了方法的有效性。背胶石墨膜测试数据和裸材参数的比较表明二者有很大偏差，表明石墨膜产品标称参数和实际参数可能有较大偏差，应用中需直接测试背胶石墨膜参数。

Abstract

Graphite film is widely used in heat dissipation of heat-generating devices in electronic equipment. In-plane thermal conductivity is the key parameter which describes the heat transfer performance. However

currently only the graphite bare material data is provided in the industry

and the glued graphite film cannot be tested. It brings great inconvenience to thermal design and product quality management. In this paper

a thermal imaging-based steady-state test method for the thermal conductivity of glued graphite film is proposed. The sample is directly adhered to the flat surface which is heated by electric heating film. The temperature gradient is integrated along a loop to eliminate the influence of non-uniform thermal flow

and the thermal loss on the surface and bypass are reduced by calibration. Experiments based on a variety of glued graphite film products and metal sheets with reference data verified the validity of the method. The comparison between the test data of the glued graphite film and the bare graphite material parameters showed that great difference may exist

indicating that the nominal performance and actual performance of the graphite film product may be significantly different

and that test on glued graphite film rather than bare material is necessary.

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references

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