Multilayer Ceramic Capacitor Electrode Thickness Control
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high capacitance while maintaining moisture resistance reliability, as the thin thickness of dielectric and internal electrode layers can lead to increased vulnerability to moisture and plating solution penetration, affecting reliability.
Innovation Solution
The solution involves controlling the thickness of electrode layers and plating layers in specific regions of the multilayer ceramic component, with central region thicknesses between 5 μm and 30 μm, outermost internal electrode region thicknesses between 5 μm and 15 μm, and corner portion thicknesses between 0.1 μm and 10 μm, to enhance moisture resistance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness of dielectric and internal electrode layers is reduced to achieve miniaturization and high capacitance, then the capacitance per unit volume increases, but the moisture resistance reliability deteriorates due to increased vulnerability to moisture and plating solution penetration
Solution Approach 1:
The patent applies different electrode layer thicknesses to different regions of the ceramic body: a first thickness (5-30 μm) for the central region, a second thickness (5-15 μm) for the outermost internal electrode region, and a third thickness (0.1-10 μm) for corner portions. This local differentiation allows the central region to provide high capacitance while the outer regions provide enhanced moisture protection, resolving the contradiction between miniaturization and reliability.
2Reliability
If the thickness of the electrode layer is increased to improve moisture resistance, then the reliability improves, but the capacitance per unit volume decreases
Solution Approach 1:
The patent strategically assigns thicker electrode layers (5-30 μm) to the central region where high capacitance is needed, while using thinner layers (0.1-10 μm) at corner portions where moisture protection is prioritized. This localized quality distribution optimizes both capacitance and reliability without requiring uniform thickness increases throughout the entire component.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body including a dielectric layer and a plurality of internal electrodes disposed to oppose each other with the dielectric layer interposed therebetween, and an external electrode formed outside the ceramic body. The external electrode includes an electrode layer, and a thickness T1 of the electrode layer corresponding to a central region of the ceramic body in a thickness direction is 5 μm or more and 30 μm or less, a thickness T2 of the electrode layer corresponding to a region in which an outermost internal electrode is located is 5 μm or more and 15 μm or less, and a thickness T3 of the electrode layer corresponding to a corner portion of the ceramic body is 0.1 μm or more and 10 μm or less.