Multilayer Ceramic Capacitor Electrodes That Resist Peeling
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Solution Overview
Problem
Multilayer ceramic electronic components with multilayer external electrodes face issues such as separation and peeling when exposed to harsh environments, leading to deterioration of electrical properties.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with internal electrodes stacked between dielectric layers and external electrodes covered with conductive layers of specific thickness (0.1 μm to 10 μm) to enhance adhesion and prevent separation, using conductive materials and binders to improve mechanical and electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electrodes have a multilayer structure to satisfy physical properties such as moisture resistance and solder bonding, then physical properties are improved, but separation and peeling occur between different external electrodes in harsh environments
Solution Approach 1:
A barrier layer is introduced as an intermediary between the base electrode and the conductive layer. This barrier layer prevents direct contact between the conductive layer and the base electrode, eliminating the galvanic couple that causes galvanic corrosion. The barrier layer has intermediate properties that prevent both moisture penetration and direct electrochemical interaction, thereby preventing separation and peeling while maintaining moisture resistance and solder bonding properties.
Solution Approach 2:
The external electrode is designed as a composite structure consisting of multiple layers: base electrode, barrier layer, and conductive layer. Each layer has specific properties that contribute to the overall performance. The barrier layer is made of a material with intermediate electrochemical properties that prevent galvanic corrosion, while the conductive layer provides electrical conductivity and solderability. This composite structure resolves the contradiction by combining materials with different properties to achieve both protection and functionality.
2Length of moving object
If external electrodes are thinned to meet miniaturization requirements, then size is reduced, but adhesion strength and resistance to separation decrease
Solution Approach 1:
The barrier layer serves as a mediator that enhances adhesion between the base electrode and the conductive layer. Even though the overall electrode thickness is reduced for miniaturization, the barrier layer provides a stable interface that prevents delamination. This intermediate layer ensures that the thin electrode structure maintains sufficient adhesion strength and resistance to separation.
Solution Approach 2:
The thickness of the barrier layer is optimized to provide sufficient adhesion and protection without adding significant overall thickness. By carefully controlling the parameters of each layer (thickness, composition, properties), the electrode achieves both miniaturization and maintained adhesion strength. The barrier layer's parameters are specifically selected to prevent separation while keeping the total electrode thickness minimal.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body having a dielectric layer, and a capacitance forming portion disposed in such a manner that first and second internal electrodes are stacked with the dielectric layer interposed therebetween, and first and second external electrodes disposed on the ceramic body, respectively, the first and second external electrodes including first and second base electrodes connected to the first and second internal electrodes, respectively, and first and second conductive layers disposed to cover the first and second base electrodes, respectively. The first and second conductive layers have a thickness in a range of 0.1 μm to 10 μm.