Multilayer Ceramic Capacitor Electrodes for Crack and Moisture Control
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Solution Overview
Problem
Multilayer ceramic capacitors are prone to cracking when subjected to bending or flexing stress, as stress is transmitted through external electrodes, leading to potential exposure and deterioration of the capacitor body due to moisture infiltration.
Innovation Solution
The design incorporates external electrodes with a base electrode layer, a first plated layer, a second plated layer, and an adhesive force mitigation layer between them, allowing the second plated layer to be in contact with the first plated layer, which mitigates adhesion force and separates under stress, reducing crack formation while maintaining moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive force mitigation film is disposed between the baked metal film and plated metal film to reduce crack formation, then the plated metal film can separate from the baked metal film under stress preventing crack propagation, but the baked metal film becomes exposed to outside air leading to moisture infiltration and deterioration
Solution Approach 1:
The patent introduces a third plated metal film as an intermediary layer between the baked metal film and the existing plated metal film. This intermediary plated layer serves as a protective barrier that prevents moisture infiltration while still allowing the outer plated metal film to separate from the baked metal film under stress, thus resolving the contradiction between crack resistance and moisture protection
Solution Approach 2:
The patent segments the plated metal film structure into multiple layers: the original plated metal film on the outside, a newly added plated metal film in the middle, and the baked metal film at the base. This segmentation allows different layers to perform different functions - the outer plated layer provides crack resistance through separation, while the middle plated layer provides moisture protection
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body, and external electrodes respectively provided on the two end surfaces of the multilayer body. The external electrodes each include a base electrode layer, a first plated layer on top of the base electrode layer, a second plated layer on top of the first plated layer, and an adhesive force mitigation layer located between the first plated layer and the second plated layer while allowing the second plated layer to be in contact with the first plated layer.