Multilayer Ceramic Capacitor Sn Zoning for Insulation and Capacitance

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Solution Overview

Problem

The existing ceramic electronic components face challenges in achieving both high insulation resistance and high electrostatic capacitance due to the diffusion of metal from internal electrode layers into the dielectric layers, leading to oxygen defects and reduced component lifetime.

Innovation Solution

The ceramic electronic component is designed with a multilayer structure where the Sn concentration in the cover layers and side margin sections is higher than in the capacity section, inhibiting the formation of solid solutions between the internal electrode metal and the dielectric ceramic, thereby improving insulation properties and maintaining high electrostatic capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Sn is added to the dielectric layer to inhibit metal diffusion and improve insulation property, then the insulation property and product life are improved, but the electrostatic capacitance decreases due to spheroidizing of internal electrode layers

Engineering Contradiction:

Improveinsulation propertyVSAvoidelectrostatic capacitance

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies local quality by creating distinct Sn concentration zones: the cover layers and side margin sections have higher Sn concentration to inhibit metal diffusion and improve insulation, while the capacity section maintains lower Sn concentration to preserve electrostatic capacitance. This spatial differentiation of material composition resolves the contradiction between insulation improvement and capacitance maintenance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The dielectric structure is segmented into functionally distinct regions: cover layers, side margin sections, and capacity sections, each with optimized Sn concentration tailored to its specific function. This segmentation allows the insulation-critical regions to have high Sn content while the capacitance-critical regions maintain low Sn content, resolving the overall contradiction.

Inventive Principle:

Principle #1Segmentation

2Duration of action of stationary object

If Sn concentration is increased in the dielectric layer to prevent solid solution formation, then the product life is extended, but the multilayer structure is disturbed leading to decreased electrostatic capacitance

Engineering Contradiction:

Improveproduct lifeVSAvoidmultilayer structure

Core Design Contradiction:

Duration of action of stationary objectVSShape

Solution Approach 1:

The patent implements local quality by restricting high Sn concentration to specific locations (cover layers and side margin sections) where structural protection is needed, while maintaining low Sn concentration in the capacity section where multilayer structure integrity is critical for capacitance. This localized approach extends product life without disturbing the overall multilayer structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The cover layers and side margin sections act as intermediary regions with high Sn concentration that serve as protective barriers, preventing metal diffusion and stabilizing the multilayer structure without requiring the entire structure to have high Sn content. This intermediary approach protects the capacitance-critical regions from degradation.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design effectively enhances the insulation resistance and extends the product life of ceramic electronic components while maintaining high electrostatic capacitance by controlling the Sn concentration in specific layers.

Implementation Method 1

Sn has effects to accelerate the sintering of the dielectric layers and accelerate the spheroidizing of the internal electrode layers

Methodology Applied

Scientific EffectSolid solution formation: Solid Solution Strengthening

Implementation Method 2

firing the ceramic multilayer structure

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentUS12211651B2Ceramic electronic component and manufacturing method of the same

Publication Date: 2025.01.28 TAIYO YUDEN KK

AI summary

A ceramic electronic component includes a multilayer structure having a substantially rectangular parallelepiped shape and including dielectric layers and internal electrode layers that are alternately stacked, the dielectric layers being mainly composed of ceramic, the internal electrode layers being formed so as to be alternately exposed to two edge faces opposite to each other of the multilayer structure, and cover layers respectively disposed on top and bottom faces of the multilayer structure in a stack direction, the cover layers being mainly composed of ceramic, wherein at least one of a Sn concentration with respect to a main component ceramic in the cover layer or a Sn concentration with respect to a main component ceramic in a side margin section is higher than a Sn concentration with respect to a main component ceramic in a capacity section.