MLCC Margin Hardness for Voltage Withstand
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving miniaturization and high capacity while maintaining voltage withstand properties, as reducing dielectric layer thickness below 0.6 μm leads to increased insulation resistance degradation and quality issues, and existing methods for comparing voltage withstand properties are inefficient.
Innovation Solution
The capacitor component incorporates a dielectric layer with first and second internal electrodes, cover portions, and margin portions with hardness ranging from 8.5 GPa to 14 GPa, which are designed to enhance voltage withstand properties and allow for estimation without applying an electric field, by controlling the hardness of the margin portions to prevent insulation breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the dielectric layer is reduced to achieve miniaturization and high capacity, then the capacity and miniaturization are improved, but the voltage withstand properties deteriorate and insulation resistance degradation increases
Solution Approach 1:
The patent applies local quality by differentiating the hardness of different regions within the dielectric layer. Specifically, the margin portions are given a hardness of 8.5 GPa or higher, while other regions may have different hardness values. This localized hardness enhancement in critical areas (margin portions near electrodes) protects against insulation breakdown without requiring the entire dielectric layer to be thicker, thus maintaining miniaturization while improving voltage withstand properties.
2Volume of moving object
If the thickness of the dielectric layer is reduced to achieve miniaturization, then the size is reduced, but the insulation resistance degradation increases
Solution Approach 1:
The patent implements local quality control by specifying that margin portions of the dielectric layer (regions adjacent to internal electrodes) shall have a hardness of 8.5 GPa or higher. This localized hardness enhancement at critical interfaces prevents insulation resistance degradation without increasing the overall component size, allowing miniaturization while maintaining reliability.
3Reliability
If the breakdown voltage is measured by continuously increasing applied voltage to compare voltage withstand properties, then the voltage withstand properties can be compared, but the measurement process is time-consuming and inefficient
Solution Approach 1:
The patent applies preliminary action by establishing hardness values (8.5 GPa or higher for margin portions) as predictive indicators of voltage withstand properties before actual breakdown testing. By measuring hardness - a quick mechanical property - manufacturers can estimate breakdown voltage and compare voltage withstand properties without performing time-consuming continuous voltage increase tests, significantly reducing measurement time while maintaining accuracy.
Data Source
AI summary
A capacitor component includes a capacitor component includes a body including a dielectric layer and first and second internal electrodes disposed to oppose each other with the dielectric layer interposed therebetween, and first and second external electrodes disposed on the body and electrically connected to the first and second internal electrodes. The body may include a capacitance forming portion including the first and second internal electrodes, cover portions disposed on upper and lower surfaces of the capacitance forming portion, and margin portions disposed on side surfaces of the capacitance forming portion, in which the margin portions have a hardness ranging from 8.5 GPa to 14 GPa.