Multilayer Ceramic Capacitor Electrode Structure for Corrosion Reliability
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Solution Overview
Problem
Existing multilayer ceramic capacitors lack reliability in terms of resistance to corrosives and electrical connection reliability, with existing technologies not adequately addressing these factors.
Innovation Solution
A multilayer ceramic capacitor design featuring a multilayer body with inner and outer electrodes, where the outer electrode includes an inner base electrode and an outer base electrode made of different metals, with a plating layer, and a glass content gradient, enhancing the electrical connection and resistance to corrosives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-base-electrode structure is used, then the device complexity is reduced, but the reliability regarding both electrical connection and resistance to corrosives deteriorates
Solution Approach 1:
The outer electrode is divided into two distinct base electrodes (inner base electrode and outer base electrode) with different glass contents and metal compositions. This segmentation allows each layer to perform specialized functions: the inner base electrode provides electrical connection with lower glass content, while the outer base electrode provides corrosion resistance with higher glass content, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
Different regions of the outer electrode are assigned different material properties. The inner base electrode has lower glass content optimized for electrical conductivity and connection, while the outer base electrode has higher glass content optimized for corrosion resistance. This local differentiation of material quality enables simultaneous optimization of both electrical connection reliability and corrosion resistance without requiring a completely complex multi-component structure.
2Reliability
If different metals are used in inner and outer base electrodes, then the resistance to corrosives is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention changes the material parameters (glass content and metal composition) of the inner and outer base electrodes to optimize performance. The inner base electrode uses metals such as Ni, Pd, or Pt with lower glass content, while the outer base electrode uses metals such as Cu, Ag, or Au with higher glass content. These parameter changes improve corrosion resistance while the parameters are controlled within specific ranges to manage manufacturing precision requirements.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body and an outer electrode. The outer electrode includes an inner base electrode, an outer base electrode, and a plating layer.The inner base electrode is on at least one of a first end surface and a second end surface and includes glass and conductive metal. The outer base electrode is on the inner base electrode and includes glass and conductive metal. The outer base electrode includes, as a main metal, a metal different from a main metal of the inner base electrode. The plating layer is provided on the outer base electrode. The inner base electrode has a glass content less than a glass content of the outer base electrode.