Multilayer Ceramic Capacitor Electrodes for Stronger Fired Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The bonding performance between internal electrodes and external electrodes in electronic components, such as multilayer ceramic capacitors, is deteriorated when the same kind of metal is used for both internal and external electrodes during the firing process.
Innovation Solution
The electronic component includes a multilayer body with dielectric layers containing at least one of Ca, Zr, or Ti, internal electrode layers made of Cu, and external electrode layers comprising a sintered electrode layer with dielectric particles of Ca, Zr, or Ti in a Ni-based metal, along with a Cu-plated, Ni-plated, or Sn-plated layer on the outer side of the sintered electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same kind of metal (Cu) is used for both internal electrodes and external electrodes, then the manufacturing process is simplified, but the bonding performance between internal electrodes and external electrodes during firing is deteriorated
Solution Approach 1:
The external electrode is designed with different material properties in different regions: the sintered electrode layer contains dielectric particles (Ca, Zr, or Ti) embedded in a Ni-based metal matrix, creating local compositional variation that optimizes bonding with Cu internal electrodes while maintaining electrical conductivity and structural integrity
Solution Approach 2:
The external electrode uses a composite structure consisting of Ni-based metal combined with dielectric particles (Ca, Zr, or Ti), creating a material that exhibits both metallic conductivity and ceramic-like bonding characteristics, thereby achieving favorable bonding performance with Cu internal electrodes during firing
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 configuration enhances the bonding performance between internal and external electrodes, ensuring the reliability and stability of the electronic component.
Implementation Method 1
the external electrode layers each include a sintered electrode layer in which dielectric particles including at least one of Ca, Zr, or Ti are included in a metal including Ni
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrode layers laminated alternately on each other, and external electrode layers on both end surfaces of the multilayer body in a length direction orthogonal or substantially orthogonal to a lamination direction, and each connected to the internal electrode layers. The dielectric layers each include at least one of Ca, Zr, or Ti, the internal electrode layers each include Cu, and the external electrode layers each include a sintered electrode layer in which dielectric particles including at least one of Ca, Zr, or Ti are included in a metal including Ni, and at least one of a Cu-plated layer, a Ni-plated layer, and a Sn-plated layer on an outer side of the sintered electrode layer.