Multilayer Ceramic Capacitor Electrode Coverage for Delamination Control
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Solution Overview
Problem
Series-structured multilayer ceramic capacitors face issues with reduced capacitance due to increased intrinsic stress from the difference in shrinkage between dielectric and internal electrode layers, leading to interface delamination.
Innovation Solution
A multilayer ceramic capacitor design with a first and second internal electrode layer extending to external electrodes and an intermediate electrode layer not connected to these electrodes, featuring increased coverage of the intermediate electrode layer to reduce stress and prevent delamination while maintaining capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of stacked internal electrode layers and dielectric layers is increased to maintain capacitance, then voltage resistance is improved, but intrinsic stress increases leading to interface delamination
Solution Approach 1:
The patent applies local quality by making the intermediate electrode layer have different coverage characteristics compared to other internal electrode layers. Specifically, the intermediate electrode layer has extended portions that reach the end surfaces of the dielectric layers, while other internal electrode layers have reduced coverage. This localized structural differentiation allows the intermediate layer to anchor and reduce stress concentration at critical interfaces, preventing delamination while maintaining the series-connected capacitance structure for high voltage resistance.
2Strength
If the number of stacked internal electrode layers and dielectric layers is increased to maintain capacitance, then voltage resistance is improved, but capacitance is reduced
Solution Approach 1:
The patent employs parameter changes by modifying the coverage parameter of the intermediate electrode layer. The intermediate electrode layer is designed with extended portions that increase its coverage area compared to other internal electrode layers. This parameter adjustment allows the intermediate layer to provide mechanical anchoring without significantly increasing the overall layer count, thereby maintaining capacitance while achieving the stress-reduction effect needed for high voltage resistance.
Data Source
AI summary
In a multilayer ceramic capacitor, a plurality of internal electrode layers include a first internal electrode layer, a second internal electrode layer, and an intermediate electrode layer. A coverage of the intermediate electrode layer is higher than a coverage of the first internal electrode layer and the second internal electrode layer.