Multilayer Ceramic Capacitor Conductive Resin Layer Plating Defects
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with interface separation and plating defects due to the infiltration of plating solutions and external impacts, which affect their reliability and performance.
Innovation Solution
A conductive resin layer with a specific weight ratio of metal to carbon, containing metal particles partially exposed on its surface, is applied between the electrode and plating layers to enhance plating properties and coupling strength, preventing interface separation and plating defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive resin layer is applied between the electrode layer and plating layer to absorb external impacts and prevent plating solution infiltration, then reliability is improved, but interface separation and non-plating defects occur
Solution Approach 1:
The conductive resin layer is designed with non-uniform metal particle distribution, where the surface portion has a higher metal content than the internal portion. This local quality variation ensures that the surface provides adequate conductivity for plating while the interior maintains bonding strength, preventing both interface separation and non-plating defects simultaneously.
Solution Approach 2:
The patent controls the weight ratio of metal to carbon in the surface portion (A) and internal portion (B) of the conductive resin layer, with A > B. By adjusting this parameter distribution, the patent optimizes both the plating properties at the surface and the bonding strength in the interior, resolving the contradiction between preventing plating defects and avoiding interface separation.
2Volume of moving object
If external electrode thickness is reduced to achieve miniaturization, then device size is decreased, but plating defects and interface separation become more frequent
Solution Approach 1:
The conductive resin layer incorporates metal particles with specific size ranges (0.1-10 μm) and controls their distribution density, creating local quality variations that enhance plating uniformity. This allows miniaturization of the external electrode while maintaining adequate conductivity and preventing plating defects through optimized local metal particle concentration.
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
The solution improves plating properties and reduces the incidence of interface separation and plating defects, ensuring higher reliability and uniform plating layers, even in small-sized ceramic components.
Implementation Method 1
a plating layer disposed on the conductive resin layer
Implementation Method 2
a resin composition containing a conductive material is applied between an electrode layer of the external electrode and a plating layer to absorb external impacts
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body including internal electrodes and dielectric layers, and an electrode layer disposed on at least one surface of the ceramic body and electrically connected to the internal electrodes. A conductive resin layer containing metal particles and a base resin is disposed on the electrode layer. When a weight ratio of metal to carbon in a surface portion of the conductive resin layer is defined as A, and a weight ratio of metal to carbon in an internal portion of the conductive resin layer is defined as B, A is greater than B.