Multilayer Ceramic Capacitor Side Margin Segmentation
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with mechanical strength, susceptibility to cracking and chipping, and poor wettability of external electrodes, particularly at the edges and side margins, which affect their performance and reliability.
Innovation Solution
The design incorporates a laminate structure with dielectric ceramic layers and internal electrode layers, featuring side margins with a bilayer or multilayer structure where the outer layer contains a higher amount of elements like Zr, Al, or Si, and a stepped portion at the edges to enhance mechanical strength and facilitate easier external electrode formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the side margin is made of a single-layer ceramic structure, then the manufacturing process is simple, but the mechanical strength is insufficient and the component is prone to cracking and chipping
Solution Approach 1:
The side margin is divided into multiple ceramic layers with different compositions and properties. The first ceramic layer has a composition similar to the dielectric ceramic layer for good bonding, while the second ceramic layer has different composition to provide enhanced mechanical strength and resistance to cracking and chipping at the lateral surface edges
Solution Approach 2:
The side margin uses a composite structure combining two different ceramic materials. The first ceramic layer uses a composition matching the dielectric layer for optimal adhesion, while the second ceramic layer uses a different composition optimized for mechanical strength and crack resistance, creating a composite structure that balances bonding and durability
2Reliability
If the joint portion uses a ceramic with large crystal grain size to reduce grain boundaries, then the bonding between laminate portion and side margin is improved, but the overall mechanical strength and hardness are reduced
Solution Approach 1:
The patent applies different ceramic compositions to different regions of the side margin. The first ceramic layer has a composition optimized for bonding to the dielectric layer, while the second ceramic layer has a different composition optimized for mechanical strength. This local differentiation allows each layer to perform its specific function optimally without compromising the other
3Ease of manufacture
If the external electrode is formed by conventional plating methods, then the electrode can be applied to the end surfaces, but the wettability at the edges and lateral surfaces is poor leading to formation difficulties
Solution Approach 1:
The side margin uses different ceramic compositions at different locations to address local bonding requirements. The first ceramic layer composition is optimized for bonding to the dielectric layer, while the second ceramic layer composition is optimized for providing a surface that improves external electrode wettability and adhesion at the lateral surfaces and edges
Data Source
AI summary
A multilayer ceramic electronic component includes a laminate, a first external electrode on a first end surface of the laminate, and a second external electrode on a second end surface of the laminate. The laminate includes a central layer portion in which each first internal electrode layer and each second internal electrode layer oppose each other with a dielectric ceramic layer therebetween, peripheral layer portions sandwiching the central layer portion in a lamination direction, and side margins sandwiching the central layer portion and the peripheral layer portions in a width direction. The side margins each include multiple ceramic layers laminated in the width direction, and the ceramic layers include an inner layer disposed closest to the laminate and an outer layer disposed farthest from the laminate.