Multilayer Ceramic Component Double-Layer External Electrode
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Solution Overview
Problem
Conventional multilayer ceramic electronic components face challenges in achieving balanced properties such as adhesiveness, copper wettability, acid resistance, and capacity contactability due to the high-temperature characteristics of glass materials, which hinder the effective formation of external electrodes with desired functions.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with dielectric layers and external electrodes composed of a first glass layer with a high barium-zinc content and a second glass layer with a high silicon content, where the second glass layer provides enhanced acid resistance and the first glass layer ensures copper wettability, forming a double-layer external electrode structure to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single type of glass is used in external electrode paste, then manufacturing is simplified, but it cannot satisfy all requirements simultaneously
Solution Approach 1:
Instead of using a single glass type throughout, the glass component is segmented into multiple types arranged in separate layers. Each layer contains a specific glass type optimized for its particular function, allowing the overall electrode to meet multiple performance requirements simultaneously while maintaining a relatively simple manufacturing process of applying multiple coats.
2Reliability
If two or three types of glass are mixed in a single layer, then multiple functions can be achieved, but it is difficult to locate each glass at the desired position
Solution Approach 1:
Multiple glass types are separated into distinct layers rather than being mixed in a single layer. This segmentation eliminates the positioning problem by giving each glass type its own dedicated space, ensuring that each glass material is located at the desired position automatically through the layering structure.
Solution Approach 2:
The solution transitions from a two-dimensional mixing approach (mixing multiple glass types in a single layer) to a three-dimensional layering approach (stacking single-type glass layers vertically). This dimensional change resolves the positioning issue by using the vertical dimension to separate and locate different glass types at their desired positions.
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 double-layer external electrode structure enhances copper wettability, prevents plating solution permeation, and improves the reliability of the multilayer ceramic electronic component by maintaining chip reliability and moisture resistance.
Implementation Method 1
a first glass contains barium-zinc (Ba—Zn)... the first glass layer ensures copper wettability
Implementation Method 2
the second glass layer provides enhanced acid resistance... prevents plating solution permeation
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body including a dielectric layer, first and second internal electrodes disposed to face each other with the dielectric layer interposed therebetween in the ceramic body, and first and second external electrodes disposed on external surfaces of the ceramic body and electrically connected to the first and second electrodes. At least one of the first and second external electrodes includes a first electrode layer including a first glass and a second electrode layer disposed on the first electrode layer and including a second glass. The first glass contains a larger amount of barium-zinc (Ba—Zn) than the second glass, and the second glass contains a larger amount of silicon (Si) than the first glass.