| 다층세라믹 콘덴서에서 생성된 크랙의 관찰과 분석 |
| 이철승, 강병성, 허강헌, 박진우1 |
삼성전기 LCR 사업부
1삼성전기 중앙연구소 |
| Investigation and Analysis of Cracks in Multi-layer Ceramic Capacitor |
| Chul-Seung Lee, Byung-Sung Kang, Kang-Heon Hur, Jin-Woo Park1 |
LCR division, Samsung Electro-Mechanics
1Corporate R&D Institute, Samsung Electro-Mechanics |
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| ABSTRACT |
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For the Y5V characteristic MLCC which is very prone to crack, it is important to to find out the basic cause of the crack. After finding out the crack origin, the materials and processes should be developed to remove the crack. The microstructures of the cracks were investigated using the fractographic method for the various types of cracks such as an exterior crack, a cyclic thermal shock crack, and an piezo-electric crack. It was found out that the crack origin was the pore at the end of the Ni inner electrode after bake-out. Even though the three dimensional crack shapes were different, the crack origins were seemed to be similar. The exterior crack could grow from the origin with the aids of residual and applied stress. FEM (finite element method) analysis was used to calculate the stress distribution of residual and applied stress. And the concept of fracture mechanics was applied for the explanation of the crack initiation and propagation from the stresses concentration. |
| Key words:
Crack, Residual stress, Piezo-electric, FEM, Stress intensity factor |
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