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http://dx.doi.org/10.4191/KCERS.2009.46.2.211

Investigation and Analysis of Cracks in Multi-layer Ceramic Capacitor  

Lee, Chul-Seung (LCR division, Samsung Electro-Mechanics)
Kang, Byung-Sung (LCR division, Samsung Electro-Mechanics)
Hur, Kang-Heon (LCR division, Samsung Electro-Mechanics)
Park, Jin-Woo (Corporate R&D Institute, Samsung Electro-Mechanics)
Publication Information
Journal of the Korean Ceramic Society / v.46, no.2, 2009 , pp. 211-218 More about this Journal
Abstract
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.
Keywords
Crack; Residual stress; Piezo-electric; FEM; Stress intensity factor;
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