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FEM을 통한 전장용 MLCC Array 모듈 형태에 따른 솔더 접합부의 열기계적 신뢰성 비교
장정기(Jeongki Jang),오철민(Chulmin Oh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, the thermal-mechanical fatigue reliability of solder joints in automotive MLCC (Multilayer ceramic capacitors) array were compared by using FEM. An energy-based fatigue model and Anand viscoplasticity model was used to predict the life of solder. Three terminal design and two materials were considered. As a result of the analysis, the life of solder joints depended on the design of the terminal. The proposed design No. 1 showed the best fatigue life. The material change in the terminals was significantly affected of solder life. Using invar showed a better fatigue life than using copper. Based on these results, we were able to present a method for comparing the thermal-mechanical fatigue reliability of automotive MLCC array solder joints in harsh environments.
Fe-Si 전기강판 폐스크랩을 이용한 3원계 Fe-9.8Si-6.0Al 합금의 연자성 특성
홍원식,양형우,박지연,오철민,이우성,김승겸,한상조,심금택,김휘준,Hong, Won Sik,Yang, Hyoung Woo,Park, Ji-Yeon,Oh, Chulmin,Lee, Woo Sung,Kim, Seung Gyeom,Han, Sang Jo,Shim, Geum Taek,Kim, Hwi-Jun 한국마이크로전자및패키징학회 2017 마이크로전자 및 패키징학회지 Vol.24 No.1
Fe-9.8Si-6.0Al mother alloy was manufactured using by Fe-3.5Si recycled scrap and Si powder. And then, soft magnetic alloy powder of $D_{50}$ size and sphere type were prepared by gas atomization process. To obtain the soft magnetic powder of a high aspect ratio, in the first, we conducted the ball milling process for 8 hours. And heat treatment was performed under $650^{\circ}C$, 2 hours and $N_2$ atmosphere condition for reducing the residual stress of the powder. Based on these process, we made around $50{\mu}m$ diameter Fe-9.8Si-6.0Al powder, which morphology and shape was a similar to the commercial Fe-Si-Al powder. Finally, the soft magnetic sheets were prepared by tape casting process using by those powders. The permeability of the tape casting sheet was measured, and we confirmed the possibility of reusing to the soft magnetic materials of Fe-Si electric sheet scrap.