Multilayer Ceramic Capacitor Silicon Gradient for Moisture Resistance
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Solution Overview
Problem
There is a demand for multilayer ceramic capacitors with improved moisture resistance reliability, particularly at the boundaries between different lamination configurations.
Innovation Solution
The multilayer ceramic capacitor design includes specific silicon concentration gradients in the ceramic dielectrics, with varying silicon content in the outer and side margin portions relative to the inner layer portions, enhancing moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the capacitor uses portions with different lamination configurations (inner electrode layers and dielectric layers only), then the device complexity is reduced and manufacturing is simplified, but the moisture resistance reliability at the boundaries deteriorates
Solution Approach 1:
The patent applies local quality by making the dielectric layers have different silicon concentrations in different regions: the first dielectric layers have a first silicon concentration while the second dielectric layers have a second silicon concentration that is higher than the first. This local compositional variation enhances moisture resistance at the boundaries between different lamination configurations without requiring complex structural changes throughout the entire device.
Solution Approach 2:
The patent changes the chemical composition parameter of the dielectric layers by varying the silicon concentration. The first dielectric layers contain silicon at a first concentration, while the second dielectric layers contain silicon at a higher second concentration. This parameter change improves moisture resistance reliability at the boundaries between different lamination portions while maintaining the simplified lamination structure.
2Reliability
If the silicon concentration in dielectric layers is increased to improve moisture resistance, then the manufacturing precision and material uniformity may deteriorate
Solution Approach 1:
The patent segments the dielectric layers into two distinct types: first dielectric layers with a first silicon concentration and second dielectric layers with a second silicon concentration. This segmentation allows precise control over silicon distribution, enabling improved moisture resistance at boundaries while maintaining manufacturing precision through controlled, discrete compositional variations rather than continuous gradients that would be difficult to control.
Solution Approach 2:
The patent applies local quality by concentrating the higher silicon content specifically in the second dielectric layers at the boundaries between different lamination configurations, while the first dielectric layers maintain a lower silicon concentration. This localized compositional optimization improves moisture resistance where it is most needed without requiring uniform high silicon content throughout the entire device, thereby maintaining manufacturing precision.
Data Source
AI summary
A multilayer ceramic capacitor has a difference between a first silicon concentration at an outer layer position and a first silicon concentration at a side margin position is greater than or equal to about 0.2 mol % and less than or equal to about 2.5 mol %, and a first silicon concentration at an origin is greater than or equal to the first silicon concentration at the outer layer position and less than or equal to the first silicon concentration at the side margin position, or the first silicon concentration at the origin is less than or equal to the first silicon concentration at the outer layer position and greater than or equal to the first silicon concentration at the side margin position.