Ni-BaTiO3 MLCCs에 대한 복합 가속 열화 시험 및 고장 분석
Multiple accelerated degradation test and failure analysis for Ni-BaTiO3 MLCCs
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초록
BaTiO3 입자 크기가 MLCCs의 절연 특성 및 MLCCs 특성 열화에 미치는 영향을 알아보기 위해 서로 다른 입 자를 사용하여 제작한 MLCCs의 가속열화시험을 150 ℃, 75 V 조건에서 실시하였다. 실험에 사용된 MLCCs는 각각 0.525 μm, 0.555 μm, 0.580 μm의 입자 크기를 가지는 BaTiO3와 Ni계 전극을 사용하여 상용화된 공정을 통해 제조되었다. 제조된 MLCCs에 대해 정상 유무 확인을 위해 X5R조건 하에서 TCC(Temperature Coefficient of Capacitance) 측정을 통해 유전 변 화율에 대해 알아보았다. 세 가지 입자 크기에 따른 절연저항의 거동을 알아보기 위해 BDV(Breakdown Voltage)를 실시하 였고, 가속열화시험 후 입자의 크기에 따른 MLCCs 열화의 정도와 원인을 알아보기 위해 XPS(X-ray photoelectron spectroscopy) 를 통해 고장분석을 하였다. BaTiO3의 입자 크기가 작을수록 절연파괴저항 및 절연저항 열화에 우수한 특성을 나타내었고, XPS 분석 결과 확인된 NiO peak과 BaTiO3 peak 감소를 통해 MLCCs 열화원인이 유전체의 산소 환원과 환원된 산소와 전 극간 반응임을 알 수 있었다.
Abstract
The accelerated life time test of the MLCCs with different BaTiO3 particle sizes were conducted at 150℃, 75 V condition and the effect of BaTiO3 particle size on the breakdown voltage and degradation characteristics of MLCCs was investigated. The MLCCs were prepared by using the BaTiO3 particles having the size of 0.525 μm, 0.555 μm, 0.580 μm and Ni-electrode, respectively. The MLCCs which have the particle size of 0.525 μm, 0.555 μm, and 0.580 μm, respectively were confirmed to meet the standard requirements of X5R (change capacitance within ± 15 % at −55~85℃) by TCC (Temperature Coefficient of Capacitance). The effect of the BaTiO3 particle size on the insulation resistance behavior of MLCCs was confirmed by BDV (Breakdown Voltage) measurements and the cause and degree of degradation of MLCCs were characterized by XPS analysis after the accelerated life test. The MLCCs with 0.525 μm-BaTiO3 showed better insulation resistance and BDV characteristics compare to other MLCCS and XPS analysis revealed that the MLCCs degradation is caused by the NiO peak and BaTiO3 peak decrease
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