Multi-Layer Ceramic Capacitor Side Margin Porosity Design
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Solution Overview
Problem
Multi-layer ceramic capacitors face challenges in balancing impact resistance and voltage resistance, as they are prone to dielectric breakdown when exposed to high voltage due to the vulnerability of their side margins.
Innovation Solution
A multi-layer ceramic capacitor design featuring a side margin with a first area of high compactness and a second area of higher porosity, which provides both structural integrity and flexibility, ensuring impact resistance and voltage resistance by preventing breakdown and crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a part including many pores is provided to the side margin, then impact resistance is improved, but voltage resistance deteriorates due to dielectric breakdown
Solution Approach 1:
The side margin is divided into two distinct areas with different porosity characteristics: a first area with low porosity (10% or less) for voltage resistance, and a second area with higher porosity (10% or more and 25% or less) for impact resistance. This local differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The side margin structure is segmented into functionally distinct zones: the first area covering the side surface provides electrical insulation, while the second area covering the first area provides mechanical cushioning. This segmentation resolves the contradiction by assigning different structural roles to different portions of the same component.
2Quantity of substance
If the side margin dimension is reduced to increase intersectional area of internal electrodes, then capacitance is improved, but impact resistance deteriorates
Solution Approach 1:
The side margin incorporates a second area with higher porosity that provides mechanical flexibility and impact absorption, allowing the overall side margin dimension to be reduced for increased capacitance while maintaining impact resistance through the porous structure's cushioning effect.
Data Source
AI summary
A multi-layer ceramic capacitor includes a multi-layer unit and a side margin. The multi-layer unit includes ceramic layers laminated in a first direction, internal electrodes disposed between the ceramic layers, and a side surface from which the internal electrodes are exposed, the side surface being oriented in a second direction orthogonal to the first direction. The side margin covers the side surface. The side margin includes a first area having a porosity of 10% or less, a dimension of the first area in the second direction from the side surface being ¼ of a dimension of the side margin in the second direction, and a second area having a porosity of 10% or more and 25% or less and having a porosity higher than the porosity of the first area, the second area covering the first area from the second direction.