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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.7 pp.443-450
DOI : https://doi.org/10.3740/MRSK.2019.29.7.443

Effect of Thermal Grease on Thermal Conductivity for Mild Steel and Stainless Steel by ASTM D5470

Young-Wook Cho1,Byung-Dong Hahn2,Ju Ho Lee3,Sung Hyuk Park4,Ju-Hwan Baeg1,Young-Rae Cho1,†
1Division of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
2Functional Ceramics Department, Korea Institute of Materials Science, Gyeong-Nam 51508, Republic of Korea
3Reliability Research Center, Korea Electronics Technology Institute, Gyeonggi-do 13509, Republic of Korea
4School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Corresponding author
E-Mail : yescho@pusan.ac.kr (Y. R. Cho, Pusan Nat’l Univ.)

Abstract

Thermal management is a critical issue for the development of high-performance electronic devices. In this paper, thermal conductivity values of mild steel and stainless steel(STS) are measured by light flash analysis(LFA) and dynamic thermal interface material(DynTIM) Tester. The shapes of samples for thermal property measurement are disc type with a diameter of 12.6 mm. For samples with different thickness, the thermal diffusivity and thermal conductivity are measured by LFA. For identical samples, the thermal resistance(Rth) and thermal conductivity are measured using a DynTIM Tester. The thermal conductivity of samples with different thicknesses, measured by LFA, show similar values in a range of 5 %. However, the thermal conductivity of samples measured by DynTIM Tester show widely scattered values according to the application of thermal grease. When we use the thermal grease to remove air gaps, the thermal conductivity of samples measured by DynTIM Tester is larger than that measured by LFA. But, when we did not use thermal grease, the thermal conductivity of samples measured by DynTIM Tester is smaller than that measured by LFA. For the DynTIM Tester results, we also find that the slope of the graph of thermal resistance vs. thickness is affected by the usage of thermal grease. From this, we are able to conclude that the wide scattering of thermal conductivity for samples measured with the DynTIM Tester is caused by the change of slope in the graph of thermal resistance-thickness.

ASTM D5470 방법으로 연강과 스테인리스강의 열전도도 측정시 열그리스의 영향

조영욱1,한병동2,이주호3,박성혁4,백주환1,조영래1,†
1Division of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
2Functional Ceramics Department, Korea Institute of Materials Science, Gyeong-Nam 51508, Republic of Korea
3Reliability Research Center, Korea Electronics Technology Institute, Gyeonggi-do 13509, Republic of Korea
4School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea

초록

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