Multilayer Electronic Component Electrodes With Graded Glass Content
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining moisture resistance and high-temperature reliability due to external stress, which can cause cracks and deteriorate their performance, especially with reduced glass content in external electrodes leading to increased moisture penetration.
Innovation Solution
A multilayer electronic component design with specific glass content ratios in external electrodes, where the area fraction of glass in certain layers exceeds others, enhancing the bonding strength and preventing moisture penetration while allowing stress relief through peeling of lower glass content layers under external stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of glass included in external electrodes is lowered to prevent cracks under external stress, then stress resistance is improved, but moisture resistance deteriorates due to increased moisture penetration through pores
Solution Approach 1:
The patent applies different glass contents to different electrode layers: the first and second electrode layers (in contact with dielectric layers) have glass content of 5-20%, while the third and fourth electrode layers (external surfaces) have glass content of 20-40%. This local differentiation allows stress absorption at internal interfaces while maintaining moisture barrier at external surfaces
Solution Approach 2:
The external electrodes are constructed as composite structures with multiple layers having different glass contents and compositions. The gradient glass content distribution (increasing from internal to external layers) creates a composite material system that simultaneously provides stress resistance and moisture protection
2Reliability
If the content of glass included in external electrodes is increased to improve moisture resistance, then moisture resistance is improved, but stress resistance deteriorates as external electrodes cannot relieve external stress
Solution Approach 1:
Different electrode layers are assigned different glass contents tailored to their specific functions: lower glass content (5-20%) in layers requiring stress flexibility, and higher glass content (20-40%) in layers requiring moisture barrier properties
Solution Approach 2:
The external electrode is segmented into multiple layers (first, second, third, and fourth electrode layers) with progressively increasing glass content from internal to external surfaces, allowing each segment to perform its specific function independently
Data Source
AI summary
A multilayer electronic component, in which a first external electrode may include a 1-2-th electrode layer including glass, and a 1-3-th electrode layer disposed on the first and second surfaces and a second external electrode may include a 2-2-th electrode layer including glass, and a 2-3-th electrode layer disposed on the first and second surfaces. In cross sections of the first and second external electrodes in the first and second directions, when an area fraction occupied by glass in the 1-2-th electrode layer is S1-2, an area fraction occupied by glass in the 1-3-th electrode layer is S1-3, an area fraction occupied by glass in the 2-2-th electrode layer is S2-2, and an area fraction occupied by glass in the 2-3-th electrode layer is S2-3, S1-2≥15%, S1-2≥S1-3, S2-2≥15%, S2-2>S2-3 are satisfied, thereby preventing cracks and improving moisture resistance reliability.