Development of highly high thermal conductivity phase change film for improve temperature stability of integrated circuits

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K14905
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Baba Masaaki 長岡技術科学大学, 工学研究科, 助教 (10826176)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 相変化材料 / 熱マネジメント

Outline of Final Research Achievements

This study focuses on a passive thermal management using vanadium dioxide (VO2). The passive thermal management using a phase change material (PCM) can absorb the heat of electronic devices by the large latent heat of the PCM and reduce the maximum temperature and temperature fluctuation of the electronic circuits. VO2 is a promising solid-solid PCM with a reversible phase transition at 68℃, and has a large volumetric latent heat. In addition, since VO2 is a solid-solid phase transition material, it can be dispersed in a resin to form a sheet, which is suitable for attaching to electronic circuits. In this study, the temperature leveling performance of VO2 was evaluated by a simulation and its validity was verified by experiments using a VO2 sintered body. Furthermore, a heat storage sheet composed of VO2 powder dispersed in a resin was prepared and its performance was evaluated.

Free Research Field

伝熱工学

Academic Significance and Societal Importance of the Research Achievements

小型化可能な熱マネジメント素子として，相転移材料(PCM)が挙げられる．PCMは相転移により吸熱/発熱反応をする材料であり，さまざまな蓄熱アプリケーションに用いられている．本研究では，固―固相転移材料(SS PCM)に着目する．SS PCMは液相に相転移しないため，液漏れの恐れがなくデバイス化が容易である．二酸化バナジウム(VO2)はSS PCMであり，室温付近で可逆的な金属―絶縁体相転移をする．しかし，VO2を熱マネジメント素子として使用したときの放熱特性は明らかとなっていない．