Multilayer Ceramic Capacitor Insulation Layer Prevents Plating Spread
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors face reliability issues due to degradation in insulation resistance characteristics, particularly from plating spread during the formation of external electrodes, which affects both hot and humid insulation resistance.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with stacked dielectric layers and internal electrodes, where an insulation layer covers 99% of the lateral surfaces except for external electrodes, preventing plating spread by forming conductive paste hardened layers and plating layers using silver, nickel, or tin, and ensuring the insulation layer does not cover the plating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electrodes are formed by a plating process, then electrical conductivity is improved, but plating spread occurs causing reliability deterioration
Solution Approach 1:
An insulation layer is formed on the lateral surfaces of the ceramic body before the plating process to define precise boundaries. This preliminary protective layer prevents plating material from spreading beyond the intended electrode regions, ensuring manufacturing precision while maintaining reliability.
Solution Approach 2:
The insulation layer acts as an intermediary barrier between the plating material and the ceramic body surface. It controls the deposition area of the external electrodes, preventing unwanted plating spread while allowing proper electrical connection in designated regions.
2Volume of moving object
If miniaturization and thinness are achieved, then compactness is improved, but insulation resistance characteristics deteriorate
Solution Approach 1:
The insulation layer is selectively applied to specific lateral surfaces where plating spread is a concern, rather than uniformly throughout. This localized approach maintains compact dimensions while providing targeted protection to critical areas, preserving insulation resistance characteristics.
Solution Approach 2:
The capacitor structure combines multiple materials including the ceramic dielectric, metal internal electrodes, conductive paste, and insulation layer. This composite construction allows miniaturization while maintaining adequate insulation through the protective insulation layer that prevents conductive material spread.
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 effectively enhances the reliability of multilayer ceramic components by preventing plating spread, thereby improving yield and maintaining high capacitance and insulation resistance, even under varying voltage applications.
Implementation Method 1
Each of the first and second external electrodes may include a conductive paste hardened layer connected to the lead portions, and a plating layer on the conductive paste hardened layer
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body having a stacked plurality of dielectric layers and first and second end portions and a plurality of lateral surfaces. A plurality of internal electrodes stacked in the ceramic body face each other with respective dielectric layers interposed therebetween and exposed to first and second lateral surfaces of the ceramic body opposing each other through respective lead portions thereof. At least two first external electrodes and at least two second external electrodes are provided on the first and second lateral surfaces to be connected to the respective lead portions, respectively. An insulation layer is provided on the first and second lateral surfaces of the ceramic body except for the first and second external electrodes.