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비정질 Ni-Ti-C합금의 원자단위 모델링과 기계적 성질 연구
천진성(Jinsung Chun),이병찬(Byeongchan Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Ni-Ti(Nitinol), known for a shape memory alloy as well as metallic glass, has properties of super elasticity and shape memory. In this study, we make the model of amorphous Ni-Ti-C system. To perform atomistic simulation for the Ni-Ti-C ternary system, modified embedded-atom method(MEAM) interatomic potential is developed based on the previously developed MEAM potentials for unary and binary systems. Elastic constants and cohesive energy for Ni-Ti-C system model is calculated using the proposed potential. Based on results from the simulation, we analyse effects of adding carbon impurities into Ni-Ti system and know that the uniaxial elastic constant increase
BaTiO₃ 기반의 적층 세라믹 캐피시터 (Multi-Layer Ceramic Capacitors)의 절연저항 열화 메커니즘과 신뢰성 분석 동향
이규탁(Ku-Tak Lee),천진성(Jinsung Chun),조욱(Wook Jo) 한국세라믹학회 2023 세라미스트 Vol.26 No.2
The demand for high performance multilayer ceramic capacitors (MLCCs) has rapidly increased keeping up with the recent trends in electronics seeking better performance per volume. It follows that thinning of dielectric layers of MLCC and atomization of powders have become two most challenging issues these days. However, it is well known that these two approaches are not free from reliability issues. In this brief review, we introduce the commonly accepted models that explain how dielectric materials fail during operation and how to evaluate the lifetime of MLCCs with a real world example.