Multilayer Ceramic Capacitor Electrode Cutaways to Prevent Cover Cracks
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Solution Overview
Problem
Multilayer ceramic capacitors often experience cracks between the active region and the cover due to delamination caused by decreased bonding strength, which worsens during sintering, leading to defects in the capacitor.
Innovation Solution
The design includes cutaway portions and holes in internal electrodes adjacent to the cover, filled with dielectric material, to enhance bonding strength between the cover and the active region, preventing cracks during sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover and internal electrode are bonded together, then bonding strength is improved, but delamination occurs during sintering causing cracks
Solution Approach 1:
The internal electrode is designed with a cutaway portion at the specific location where it contacts the cover, creating a localized structural modification. This cutaway portion allows the dielectric material to extend into the electrode, forming a interlocking structure that locally enhances bonding strength at the cover-electrode interface without affecting the overall electrode structure or performance
Solution Approach 2:
The internal electrode structure combines conductive material with dielectric material in a composite configuration. The cutaway portion is filled with dielectric material, creating a composite structure where the conductive electrode and dielectric filler work together to provide both electrical function and enhanced mechanical bonding to the cover
Data Source
AI summary
Provided are a multilayer ceramic capacitor and a board having the same, the multilayer ceramic capacitor including: a capacitor body including an active region, which includes a plurality of dielectric layers and a plurality of internal electrodes alternately disposed with respective dielectric layers interposed therebetween, and covers formed on and under the active region, respectively. The multilayer ceramic capacitor further includes external electrodes disposed on the capacitor body so as to be connected to the internal electrodes. Among the internal electrodes, an internal electrode disposed adjacently to one of the covers has at least one cutaway portion within a portion of the internal electrode connected to the external electrode, and the cutaway portion is (at least partially) filled with a dielectric material.