Ceramic Electronic Component Electrode Plating for Flexural Strength
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Solution Overview
Problem
Multilayer ceramic capacitors require enhanced flexural strength and reliability to meet the demands of small-sized, high-power electronic devices and automotive applications, with existing structures failing to consistently provide sufficient strength and solderability.
Innovation Solution
A ceramic electronic component design featuring a body with dielectric layers and internal electrodes, along with external electrodes comprising a nickel plating layer and a tin plating layer, where the nickel plating layer extends beyond the conductive resin layer, and the tin plating layer extends beyond the nickel plating layer, with specific thickness ratios to ensure adequate flexural strength and solderability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the nickel plating layer thickness is increased to improve flexural strength, then the flexural strength increases, but the manufacturing cost and plating time increase
Solution Approach 1:
The patent optimizes the nickel plating layer thickness to a specific range (0.5-7 micrometers) to achieve the necessary flexural strength while controlling manufacturing costs. This parameter optimization resolves the contradiction by finding the optimal thickness that provides sufficient strength without excessive material consumption and processing time.
Solution Approach 2:
The patent employs a multi-layer plating structure combining nickel and tin layers, where each layer serves a specific function. The nickel layer provides flexural strength and adhesion, while the tin layer provides solderability. This composite structure resolves the contradiction by distributing functions across multiple layers, allowing each layer to be optimized for its specific purpose rather than requiring a single thick layer to perform all functions.
2Strength
If the nickel plating layer thickness is increased to improve flexural strength, then the flexural strength increases, but the plating time increases
Solution Approach 1:
The patent specifies an optimal nickel plating thickness range (0.5-7 micrometers) that achieves sufficient flexural strength while minimizing plating time. By establishing this parameter range, the patent resolves the time-strength contradiction by identifying the point where additional plating time yields diminishing returns in terms of strength improvement.
Solution Approach 2:
The multi-layer plating system (nickel + tin) allows for thinner individual layers compared to a single-layer system, as each layer contributes to the overall performance. This reduces the total plating time required while maintaining or improving flexural strength characteristics.
3Reliability
If the external electrode structure is modified to extend plating layers beyond the conductive resin layer, then the flexural strength and solderability are improved, but the device complexity increases
Solution Approach 1:
The patent applies different plating layer configurations to different regions of the external electrode. The nickel and tin plating layers extend beyond the conductive resin layer specifically at the band portion that contacts the mounting board, while other areas maintain the standard structure. This localized modification resolves the contradiction by providing enhanced solderability and flexural strength only where needed, rather than complicating the entire electrode structure.
Solution Approach 2:
The patent uses a composite plating structure with nickel and tin layers serving different functions. The nickel layer provides structural integrity and adhesion to the body, while the tin layer provides solderability. This functional differentiation within the composite structure resolves the contradiction by achieving multiple performance goals (strength and solderability) through a organized multi-layer system rather than a single complex layer.
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 design achieves sufficient flexural strength of 5 mm or more and secure solderability by controlling the thickness ratios of the nickel and tin plating layers, reducing the frequency of flexural cracking and improving mounting characteristics.
Implementation Method 1
a nickel (Ni) plating layer disposed on the conductive resin layer, and a tin (Sn) plating layer disposed on the Ni plating layer
Data Source
AI summary
A ceramic electronic component includes a body including dielectric layers and a plurality of internal electrodes and an external electrode including a connection portion and a band portion. The external electrode includes an electrode layer, a conductive resin layer, a nickel plating layer, and a tin plating layer. When an electrode layer thickness, a conductive resin layer thickness, a nickel plating layer thickness, a tin plating layer thickness of the band portion are defined as t3, t4, and t5, respectively, t5 is greater than or equal to 0.5 micrometer and less than 7 micrometer, and t5/(t3+t4) satisfies 1≤t5/(t3+t4)*100<17.5 in the case in which t3+t4 is less than or equal to 100 micrometers and satisfies 0.3≤t5/(t3+t4)*100<4.38 in the case in which t3+t4 is more than 100 micrometers.