Multi-layered Ceramic Capacitor Segmented Dielectric Layers
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining mechanical reliability and moisture resistance as the number of stacked layers increases, leading to potential delamination and cracking due to increased electrode thickness and dielectric layer elongation.
Innovation Solution
A multilayer ceramic capacitor design featuring sequentially stacked dielectric layers with internal electrodes and coupling portions to enhance bonding and mechanical strength, while also improving moisture resistance through specific electrode configurations and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of stacked layers is increased to achieve ultra-high capacity, then the capacity is improved, but the mechanical reliability deteriorates due to delamination and cracking
Solution Approach 1:
The patent divides the dielectric layer into multiple sub-layers (first dielectric layer, second dielectric layer, third dielectric layer) with different material compositions and properties. Each sub-layer is optimized for specific functions: the first sub-layer provides high permittivity for capacitance, the second sub-layer provides mechanical strength, and the third sub-layer provides flexibility. This segmentation allows the structure to accommodate thermal expansion differences and mechanical stresses without delamination or cracking, thereby maintaining high reliability while achieving ultra-high capacity through increased stacking layers.
2Quantity of substance
If the number of stacked layers is increased to achieve ultra-high capacity, then the capacity is improved, but the chip size increases
Solution Approach 1:
The patent applies local quality by using different material compositions in different regions of the dielectric layer. The first dielectric layer uses a barium titanate-based ceramic composition with high permittivity for maximum capacitance density. The second dielectric layer uses a different composition optimized for mechanical strength and thermal stability. The third dielectric layer uses yet another composition for flexibility and stress relief. This localized optimization allows each sub-layer to contribute its specific property, enabling high capacity in a compact volume by maximizing the functional efficiency of each stacked layer.
3Quantity of substance
If the electrode thickness is increased to accommodate more stacked layers, then the capacity is improved, but the mechanical strength deteriorates due to stress concentration
Solution Approach 1:
The patent employs composite materials by combining multiple dielectric sub-layers with different material properties within a single capacitor structure. The first dielectric layer uses a barium titanate-based ceramic with high permittivity. The second dielectric layer uses a composition optimized for mechanical strength and crack resistance. The third dielectric layer uses a flexible composition for stress relief. This composite structure allows the electrode thickness to be increased for higher capacity while the varied material properties of different sub-layers distribute and mitigate mechanical stresses, preventing crack propagation and maintaining overall structural strength.
Data Source
AI summary
A multilayer ceramic capacitor includes a body including a first dielectric layer on which a first internal electrode, a first coupling portion, and a second internal electrode are disposed, a second dielectric layer on which a third internal electrode, a second coupling portion, and a fourth internal electrode are disposed, and a third dielectric layer on which a fifth internal electrode or a sixth internal electrode is disposed, and first and second external electrodes connected to the first to sixth internal electrodes, and disposed on both surfaces of the body in the first direction. The first to third dielectric layers are sequentially stacked.