Multilayer Ceramic Component Structure to Prevent Thin-Body Cracks

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Solution Overview

Problem

Multilayer ceramic electronic components with reduced thickness face challenges in maintaining mechanical strength, leading to cracks and flaws, and existing manufacturing methods like barrel polishing can further damage the components.

Innovation Solution

A multilayer ceramic electronic component design featuring internal electrode layers exposed at end surfaces with auxiliary electrode layers and via conductors within the ceramic layers, increasing the proportion of metal hardness and reducing the need for barrel polishing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the thickness of the multilayer ceramic electronic component is reduced, then the size and thickness of the component are decreased, but the mechanical strength decreases leading to cracks and flaws

Engineering Contradiction:

ImprovethicknessVSAvoidmechanical strength

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The patent uses a composite structure combining ceramic layers with metal internal electrodes and auxiliary electrodes. The auxiliary electrodes (first and second auxiliary electrode layers) are embedded within the ceramic layers to provide mechanical reinforcement. This composite approach allows the component to maintain high mechanical strength even when the overall thickness is reduced, preventing cracks and flaws that would normally occur in thin ceramic structures.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local reinforcement by strategically placing auxiliary electrodes at specific locations within the ceramic layers. The first auxiliary electrode layer is positioned near the first internal electrode layer, and the second auxiliary electrode layer is positioned near the second internal electrode layer. This localized placement of metal electrodes provides targeted mechanical support where needed most, allowing the thin ceramic structure to maintain strength without adding overall thickness.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If barrel polishing is performed to expose internal electrodes, then the internal electrodes are exposed to end surfaces, but the multilayer body is damaged causing cracks and flaws

Engineering Contradiction:

Improveelectrode exposureVSAvoidmechanical strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent incorporates the auxiliary electrode layers during the initial lamination process, before the multilayer body is formed and before any polishing operations. The first auxiliary electrode layer is laminated together with the first internal electrode layer, and the second auxiliary electrode layer is laminated together with the second internal electrode layer. This preliminary placement ensures that the reinforcement structure is already in place to prevent damage during subsequent barrel polishing operations, eliminating the need for post-formation reinforcement.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The auxiliary electrode layers act as a cushioning or protective structure within the ceramic layers. These metal layers provide a buffer that absorbs and distributes stress during the barrel polishing process, preventing the ceramic from cracking or flaking. The auxiliary electrodes are positioned to provide this protective effect before any damaging forces are applied during manufacturing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS12462977B2Multilayer ceramic electronic component including via conductors not exposed to principal surfaces

Publication Date: 2025.11.04 MURATA MFG CO LTD

AI summary

In a multilayer ceramic electronic component, a first auxiliary electrode layer spaced away from a second internal electrode layer and exposed to a first end surface is on a same plane as a ceramic layer on which the second internal electrode layer is located, a second auxiliary electrode layer spaced away from a first internal electrode layer and exposed to a second end surface is on a same plane as the ceramic layer on which the first internal electrode layer is located, a first via conductor is at a central portion in a width direction of the first internal electrode layer and the first auxiliary electrode layer and exposed to the first end surface, and a second via conductor is at a central portion in a width direction of the second internal electrode layer and the second auxiliary electrode layer and exposed to the second end surface.