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Korean Journal of Metals and Materials > Volume 55(7); 2017 > Article
Korean Journal of Metals and Materials 2017;55(7): 523-528. doi: https://doi.org/10.3365/KJMM.2017.55.7.523
2층금속 클래드메탈의 두께방향으로 섬광법 적용 열전도도 측정과 예측모델 연구
김종구1, 주재훈1, 김동용1, 박성혁2, 조영래1
1부산대학교 재료공학과
2경북대학교 신소재공학부
Thermal Conductivity of Double-Layer Clad Metals along the Thickness Direction Using Light Flash Analysis and Estimation Models
Jong-Gu Kim1, Jae-Hoon Ju1, Dong-Yong Kim1, Sung Hyuk Park2, Young-Rae Cho1
1Division of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
2School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Correspondence  Young-Rae Cho ,Tel: +82-51-510-2389, Email: yescho@pusan.ac.kr
Received: 1 December 2016;  Accepted: 15 February 2017.  Published online: 4 July 2017.
ABSTRACT
Heat transfer plays a critical role in the fabrication of high efficiency electronic devices. Double-layer clad metals consisting of stainless steel (STS) and aluminum (Al) alloy were fabricated by the roll bonding process, and their thermal conductivity was calculated using measurements of density, specific heat, and thermal diffusivity obtained by light flash analysis. The microstructure at the interface between the STS and Al plates was characterized by scanning electron microscopy. The results revealed a big difference in thermal conductivity along the thickness direction compared to the value obtained from the series model. The difference was due to the interface characteristics of the double-layer samples. In particular, the measured thermal conductivity was 6~10% smaller than the arithmetic average (mean value) of the parallel and series models. From this study, it can be concluded that the thermal conductivity of the double-layer clad metals approaches the mean value obtained with parallel and series models when the interface is narrow and pure.
Keywords: thermal conductivity, double-layer, series model, interface effect, clad metal, heat transfer
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