MLCC Electrode Segregation Layout for High-Temperature Reliability
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Solution Overview
Problem
Multilayer ceramic capacitors experience a decrease in high-temperature load reliability due to thinning of dielectric layers near the boundary with the outer layer portion, which is exacerbated by the segregation of metal components.
Innovation Solution
Incorporating a segregated region of magnesium or manganese in the internal electrode layer, with a specific ratio of the segregated region to the existing region of about 50% to 75% in the length direction, to prevent dielectric layer thinning and enhance high-temperature load reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the multilayer ceramic capacitor is manufactured with conventional dielectric layers and internal electrode layers, then the manufacturing process is simple and cost-effective, but the dielectric layers are partially thinned due to metal segregation, causing decreased high-temperature load reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the internal electrode layer by incorporating specific metal elements (Ni, Co, Mn, Zn) in controlled amounts. This compositional parameter change prevents metal segregation during sintering, thereby maintaining uniform dielectric layer thickness and improving high-temperature load reliability without complicating the manufacturing process
Solution Approach 2:
The patent creates a composite internal electrode layer material by combining multiple metal elements (Ni, Co, Mn, Zn) with the base metal material. This composite structure prevents segregation by creating a more stable solid solution, which in turn prevents dielectric layer thinning and improves reliability while maintaining manufacturing simplicity
2Quantity of substance
If the dielectric layers are made thinner to increase capacitance density, then the capacitor size is reduced and capacitance is increased, but the high-temperature load reliability decreases due to increased susceptibility to metal segregation and breakdown
Solution Approach 1:
The patent modifies the internal electrode layer composition parameters to prevent metal segregation. This allows the use of thinner dielectric layers without the risk of thinning-induced reliability issues, as the controlled composition stabilizes the interface between the electrode and dielectric layers, enabling high capacitance density with maintained reliability
Data Source
AI summary
In a multilayer ceramic capacitor, when an internal electrode layer closest to one of outer layer portions is defined as an outermost internal electrode layer, the outermost internal electrode layer includes an internal electrode existing region and an internal electrode dividing region. The internal electrode dividing region includes a segregated region of magnesium or manganese, and a ratio B/A of a distance B in a length direction of the segregated region of magnesium or manganese relative to a distance A in the length direction of the internal electrode existing region is about 50% or more and about 75% or less.