MLCC Electrode-End Silica Segregation Against Short Circuits
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Solution Overview
Problem
Multilayer ceramic capacitors often experience short circuiting between internal electrode layers due to surface contact issues, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating a segregation of silica (Si) at the ends of internal electrode layers, where the average particle size of dielectric particles is smaller than in the central portion, to prevent moisture penetration and reduce short circuiting, while maintaining high capacitance through controlled dielectric ceramic layer thickness and particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of laminated dielectric ceramic layers is increased and the thickness is reduced to achieve high capacitance, then the capacitance increases, but the risk of short circuiting between internal electrode layers increases
Solution Approach 1:
The patent applies local quality by creating a segregation of Si in the dielectric ceramic layer specifically at the vicinity of the end of the internal electrode layer in the width direction. This localized modification of particle size and composition addresses the short circuiting problem at critical locations without compromising the overall capacitance achieved through multiple thin layers.
Solution Approach 2:
The patent changes the parameter of dielectric particle size distribution within the dielectric ceramic layer. By making the average particle size smaller at the end regions compared to the central portion, the patent optimizes both the insulation properties (preventing short circuits) and the capacitance characteristics through controlled parameter variation.
2Reliability
If the average particle size of dielectric particles is increased to improve dielectric properties, then the dielectric constant improves, but the capacitance per unit thickness decreases
Solution Approach 1:
The patent implements local quality by differentiating the average particle size of dielectric particles between different regions of the dielectric ceramic layer. The central portion has larger particles for optimal dielectric properties, while the end regions have smaller particles to prevent short circuiting, thus achieving both goals simultaneously.
Solution Approach 2:
The patent segments the dielectric ceramic layer into regions with different particle size characteristics. This segmentation allows different parts of the same layer to serve different functions: the central region optimizes for dielectric constant while the end regions optimize for electrical insulation and short circuit prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces or prevents short circuiting, ensuring high reliability and achieving high capacitance by controlling particle size and distribution, thereby enhancing the overall performance of multilayer ceramic capacitors.
Implementation Method 1
the multilayer body includes a segregation mainly including Si in a vicinity of an end of the internal electrode layer in the width direction
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including the dielectric ceramic layers and the internal electrode layers which are laminated, and external electrodes connected to the internal electrode layers. The multilayer body includes segregation including Si as a main component in a vicinity of an end of the internal electrode layer in a width direction. An average particle size of the dielectric particles in the vicinity of the end of the internal electrode layer in the width direction in the dielectric ceramic layer is smaller than an average particle size of a dielectric particles in a central portion of the internal electrode layer in the width direction in the dielectric ceramic layer.