MLCC Side Margin Composition for Step Difference Reliability
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Solution Overview
Problem
The challenge of miniaturization and high capacitance in multilayer ceramic capacitors is hindered by step differences in internal electrodes, which degrade high-temperature reliability and withstand voltage properties.
Innovation Solution
A multilayer electronic component design incorporating side margin portions with controlled Sn content (0.1-4.0 mol%) and Ba/Ti ratio (1.040-1.070) and dielectric grain sizes (100-290 nm) to stabilize the structure and enhance mechanical and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of layers is increased to achieve miniaturization and high capacitance, then the capacitance increases, but step difference is formed in the width direction of the internal electrode
Solution Approach 1:
The patent applies local quality by forming a side margin portion with different material composition (specific Sn content of 0.1-4.0 mol%) and different dielectric grain size (100-290 nm) at the side regions of the capacitor body, while the central regions maintain the standard composition. This localized modification addresses the step difference problem specifically at the edges where it occurs most severely, without changing the overall structure of the multi-layer capacitor.
Solution Approach 2:
The patent changes physical and chemical parameters of the side margin portion, specifically controlling Sn content (0.1-4.0 mol%), Ba/Ti ratio (1.040-1.070), and dielectric grain size (100-290 nm). These parameter changes modify the material properties at the side regions to reduce step difference and improve high-temperature reliability and withstand voltage properties.
2Quantity of substance
If the thickness of the internal electrode and dielectric layer is decreased to achieve miniaturization, then the capacitance increases, but the mechanical strength decreases
Solution Approach 1:
The side margin portion with optimized material composition and fine dielectric grains (100-290 nm) provides localized structural reinforcement at the edges of the capacitor body. This local quality enhancement compensates for the reduced mechanical strength caused by thinner internal electrodes and dielectric layers in the central regions.
Solution Approach 2:
The patent creates a composite structure where the side margin portion has different material composition (with Sn content of 0.1-4.0 mol% and specific Ba/Ti ratio) compared to the central regions. This composite approach allows the side regions to provide enhanced mechanical support while the central regions maintain high capacitance density.
3Quantity of substance
If the number of layers is increased to achieve high capacitance, then the capacitance increases, but high-temperature reliability degrades
Solution Approach 1:
The side margin portion with controlled Sn content (0.1-4.0 mol%) and fine dielectric grains (100-290 nm) provides localized high-temperature stability at the edges of the capacitor body. This local quality enhancement prevents degradation at critical edge regions where high-temperature reliability is most vulnerable in multi-layer structures.
Solution Approach 2:
The patent changes the chemical composition parameters (Sn content, Ba/Ti ratio) and microstructural parameters (dielectric grain size) of the side margin portion to optimize high-temperature reliability. These parameter changes create a more stable material structure at the sides that can withstand high-temperature conditions better than conventional uniform compositions.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and internal electrodes alternately disposed with the dielectric layer in a first direction; external electrodes disposed on the body; and side margin portions disposed on the body, wherein an average content of Sn included in the side margin portion is 0.1 mol % or more and 4.0 mol % or less, wherein a Ba/Ti ratio of the side margin portion is greater than 1.040 and less than 1.070, and wherein an average size of a plurality of dielectric grains included in the side margin portion satisfies 100 nm or more and 290 nm or less.