MLCC Base Electrode Porosity Structure for Crack Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with crack resistance due to external force applications, which can lead to structural failures.
Innovation Solution
The design incorporates a multilayer ceramic electronic component with a base electrode layer that includes both metal and non-metal portions, where the non-metal portions have an average area of about 10 μm² or more and a circularity of 0.4 or less, and a proportion of 8.2% or more, providing stress relief and enhancing crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base electrode layer is provided on the end surface of the multilayer body to prevent moisture entry and provide electrical connection, then reliability is improved, but crack resistance deteriorates when external force is applied
Solution Approach 1:
The base electrode layer is designed with non-uniform composition, containing both metal portions and non-metal portions with different mechanical properties. The metal portions provide electrical conductivity and moisture barrier functions, while the non-metal portions provide flexibility and stress absorption, allowing different regions of the same layer to serve different functions and resolve the contradiction between reliability and crack resistance
Solution Approach 2:
The base electrode layer is constructed as a composite material system combining metal and non-metal components. This composite structure leverages the advantages of both materials: the metal provides electrical connectivity and corrosion resistance, while the non-metal provides mechanical flexibility and crack resistance, enabling the layer to simultaneously achieve moisture prevention and external force resistance
2Reliability
If the base electrode layer is made entirely of metal to ensure electrical connection, then electrical conductivity is improved, but crack resistance deteriorates under external force
Solution Approach 1:
The base electrode layer is designed with non-uniform composition, containing both metal portions and non-metal portions with different mechanical properties. The metal portions provide electrical conductivity and moisture barrier functions, while the non-metal portions provide flexibility and stress absorption, allowing different regions of the same layer to serve different functions and resolve the contradiction between reliability and crack resistance
Solution Approach 2:
The base electrode layer is constructed as a composite material system combining metal and non-metal components. This composite structure leverages the advantages of both materials: the metal provides electrical connectivity and corrosion resistance, while the non-metal provides mechanical flexibility and crack resistance, enabling the layer to simultaneously achieve moisture prevention and external force resistance
3Strength
If the base electrode layer is made entirely of non-metal to improve crack resistance, then crack resistance is improved, but electrical conductivity deteriorates
Solution Approach 1:
The base electrode layer is designed with non-uniform composition, containing both metal portions and non-metal portions with different mechanical properties. The metal portions provide electrical conductivity and moisture barrier functions, while the non-metal portions provide flexibility and stress absorption, allowing different regions of the same layer to serve different functions and resolve the contradiction between reliability and crack resistance
Solution Approach 2:
The base electrode layer is constructed as a composite material system combining metal and non-metal components. This composite structure leverages the advantages of both materials: the metal provides electrical connectivity and corrosion resistance, while the non-metal provides mechanical flexibility and crack resistance, enabling the layer to simultaneously achieve moisture prevention and external force resistance
Data Source
AI summary
A ceramic capacitor includes a multilayer body, and first and second external electrodes including first and second based electrode layers. The first and second external electrodes are spaced from each other and provided on end surfaces of the multilayer body in a length direction. The first and second base electrode layers each include a metal portion and non-metal portions in the metal portion. In a cross sectional view perpendicular or substantially perpendicular to a width direction, an average area of the non-metal portions in a first population of the non-metal portions, each having a circularity of about 0.4 or less, is about 10 μm2 or more, and a proportion of the plurality of non-metal portions in each of the first and second base electrode layers is about 8.2% or more.