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2019 Vol.29, Issue 7 Preview Page
Effect of Thermal Grease on Thermal Conductivity for Mild Steel and Stainless Steel by ASTM D5470

ASTM D5470 방법으로 연강과 스테인리스강의 열전도도 측정시 열그리스의 영향

Young-Wook Cho1
,
Byung-Dong Hahn2
,
Ju Ho Lee3
,
Sung Hyuk Park4
,
Ju-Hwan Baeg1
,
Young-Rae Cho1†
조 영욱1
,
한 병동2
,
이 주호3
,
박 성혁4
,
백 주환1
,
조 영래1†
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
1부산대학교 재료공학과
2재료연구소
3전자부품연구원
4경북대학교 신소재공학부
†Corresponding author E-Mail : yescho@pusan.ac.kr (Y. R. Cho, Pusan Nat’l Univ.)
July 2019. pp. 443-450
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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.

Keywords
thermal conductivity
mild steel
light flash analysis
DynTIM Tester
thermal grease
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 29
  • No :7
  • Pages :443-450
  • Received Date : 2019-04-04
  • Revised Date : 2019-07-02
  • Accepted Date : 2019-07-02
  • DOI :https://doi.org/10.3740/MRSK.2019.29.7.443
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