Ceramic Electronic Component External Electrodes Tin Plating
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Solution Overview
Problem
The reliability of ceramic electronic components is compromised by the permeation of plating solutions and hydrogen gas generation during nickel plating, which can lead to reduced performance and increased manufacturing complexity.
Innovation Solution
A ceramic electronic component with external electrodes formed using a conductive resin containing metal powders like tin, which eliminates the need for nickel plating, ensuring direct tin plating and preventing alloy formation issues, while metal layers enhance electrical connectivity and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nickel plating layers are formed through electroplating to prevent copper diffusion and increase heat resistance, then the external electrodes gain improved protection and thermal performance, but plating solution permeates into the electronic component and hydrogen gas is generated, decreasing reliability
Solution Approach 1:
The patent extracts and removes the nickel plating layer from the external electrode structure, eliminating the source of plating solution permeation and hydrogen gas generation while maintaining the essential functionality of the external electrode through direct tin plating on the copper substrate
Solution Approach 2:
The patent introduces a tin plating layer as an intermediary that directly contacts the copper external electrode, eliminating the need for nickel as an intermediate layer and thereby preventing plating solution permeation and hydrogen generation while still providing the necessary barrier and thermal performance
2Ease of manufacture
If nickel plating layers are formed to prevent copper diffusion to tin plating layers, then the external electrodes maintain structural integrity, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent extracts the nickel plating layer from the manufacturing process, reducing the number of plating steps from two (copper to nickel, then nickel to tin) to one (copper to tin), thereby simplifying the manufacturing process and reducing complexity
Solution Approach 2:
The patent changes the plating parameters by directly plating tin on copper instead of requiring nickel as an intermediate layer, modifying the plating process to use different chemical compositions and conditions that enable direct tin deposition on copper without the intermediate nickel step
3Productivity
If tin plating layers are directly formed on external electrodes without nickel plating, then manufacturing time and costs are reduced, but copper diffusion to tin plating layers may occur, compromising performance
Solution Approach 1:
The patent changes the plating parameters by optimizing the tin plating process to deposit tin directly on copper with controlled thickness and adhesion properties, using specific chemical compositions and deposition conditions that prevent copper diffusion while maintaining manufacturing efficiency
Solution Approach 2:
The patent creates a composite structure where tin plating layer directly bonds to copper external electrode, forming a metallurgical bond that prevents diffusion while maintaining structural integrity, utilizing the complementary properties of both materials in a direct contact configuration
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
This approach improves the reliability and durability of ceramic electronic components by preventing plating solution permeation, reducing manufacturing time and costs, and enhancing solderability and electrical connectivity without compromising performance.
Implementation Method 1
external electrodes disposed on outer surfaces of the ceramic body and electrically connected to the internal electrodes; The external electrodes may comprise a conductive resin. The conductive resin may contain a metal powder comprising at least one selected from the group consisting of nickel (Ni), aluminum (Al), copper (Cu), gold (Au), silver (Ag), tin (Sn), palladium (Pd), platinum (Pt), and an alloy thereof
Implementation Method 2
the nickel plating layers are formed through electroplating. In this case, a plating solution may permeate into the electronic component, or hydrogen gas may be generated when the plating is performed
Data Source
AI summary
A ceramic electronic component includes a ceramic body; internal electrodes disposed in the ceramic body; external electrodes disposed on outer surfaces of the ceramic body and electrically connected to the internal electrodes; and tin plating layers disposed on the external electrodes.