Multilayer Capacitor Mo Gradient for Moisture-Resistant Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high capacitance and reliability due to moisture ingress through gaps between internal electrodes and cover portions, leading to burnt defects and reduced reliability, especially when side margin portions are thinned for increased capacitance.
Innovation Solution
Incorporating molybdenum (Mo) in the active, cover, and side margin portions with varying Mo content gradients to enhance moisture resistance and corrosion resistance, improving the Schottky barrier and hydrogen adsorption, thereby improving the reliability of the multilayer electronic component without significant changes to the design or sintering conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the side margin portion thickness is reduced to increase capacitance per unit volume, then the capacitance is improved, but the reliability deteriorates due to decreased thickness of the side margin portion
Solution Approach 1:
The patent applies local quality by creating a Mo content gradient within the side margin portion, where the Mo content varies from the outer surface toward the inner region. This gradient structure provides enhanced corrosion resistance at the Mo-rich outer surface while maintaining the thinned geometry for high capacitance, thus resolving the contradiction between increased capacitance and maintained reliability.
2Reliability
If moisture resistance is improved by adding Mo to the side margin portion, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs parameter changes by controlling the Mo content distribution through composition parameters rather than structural redesign. By adjusting the Mo content gradient in the side margin portion, the patent achieves improved moisture resistance while maintaining compatibility with existing manufacturing processes, thus avoiding significant increases in manufacturing complexity.
3Quantity of substance
If the effective volume fraction of electrodes is increased for miniaturization, then the capacitance is improved, but the moisture resistance deteriorates due to larger gaps between internal electrodes and cover portion
Solution Approach 1:
The patent applies local quality by concentrating Mo enrichment specifically in the side margin portion and interfacial regions where moisture ingress is most likely to occur. This localized approach provides enhanced corrosion resistance at critical interfaces without requiring uniform Mo distribution throughout the entire component, thus maintaining high capacitance while improving moisture resistance.
Solution Approach 2:
The Mo-containing side margin portion acts as an intermediary barrier between the internal electrodes and the external environment. This intermediate layer with gradient Mo content provides a protective interface that prevents direct moisture contact with the electrode-dielectric interfaces, thus resolving the contradiction between increased effective volume fraction and improved moisture resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The Mo content gradient in the multilayer electronic component effectively enhances moisture resistance and corrosion resistance, reducing defects and improving the reliability and lifespan of the component under high-temperature and high-humidity conditions.
Implementation Method 1
improving the Schottky barrier and hydrogen adsorption
Implementation Method 2
improving the Schottky barrier and hydrogen adsorption
Data Source
AI summary
A multilayer electronic component includes a body including a plurality of dielectric layers, a side margin portion disposed on the body, and external electrodes disposed on the body. The body includes an active portion having internal electrodes alternately arranged with the dielectric layer interposed therebetween in the first direction and a cover portion disposed on both end surfaces of the active portion in a first direction, the active portion. The cover portion, and the side margin portion include molybdenum (Mo). A Mo content in an interfacial portion, a region of the active portion, adjacent to one of the cover portion or the side margin portion, is higher than a Mo content in a central portion of the active portion. A Mo content in the one of the cover portion and the side margin portion is higher than the Mo content in the interfacial portion.