Ceramic Electrode Layout for Suppressing Surface Migration
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Solution Overview
Problem
Conventional ceramic components with alkali metal on the entire outer surface experience surface migration issues.
Innovation Solution
Differentially distribute the concentration of alkali metal and alkaline earth metals in the vicinity of external electrodes, with higher concentrations near side surface electrodes compared to end surface electrodes, enhancing migration suppressing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkali metal is disposed on the entire outer surface of the ceramic body, then electrical resistance is increased, but surface migration occurs
Solution Approach 1:
The patent applies local quality by creating different alkali metal concentrations in different regions of the ceramic body. Specifically, the alkali metal concentration is made higher in the vicinity of external electrodes compared to other regions. This localized differentiation suppresses surface migration near the electrodes while maintaining the electrical resistance benefits of alkali metal presence throughout the body.
Solution Approach 2:
The patent changes the concentration parameter of alkali metal distribution within the ceramic body. By adjusting the alkali metal concentration to be higher near external electrodes and lower in other regions, the patent optimizes both the electrical resistance and migration suppression properties. This parameter differentiation resolves the contradiction between maintaining high resistance and preventing surface migration.
2Reliability
If alkali metal concentration is increased to suppress migration, then sealing properties improve, but plating flow may occur
Solution Approach 1:
The patent applies local quality by concentrating alkali metal in specific regions (vicinity of external electrodes) rather than uniformly distributing it throughout the entire ceramic body. This localized high concentration improves sealing properties where needed, while the lower concentration in other regions prevents plating flow during manufacturing processes.
Solution Approach 2:
The patent changes the spatial distribution parameter of alkali metal concentration. By creating a non-uniform concentration profile with higher values near external electrodes and lower values elsewhere, the patent achieves improved sealing properties in critical areas while avoiding the harmful plating flow effect that would result from uniform high concentration throughout the body.
Data Source
AI summary
A ceramic component includes a ceramic body, internal electrodes inside the ceramic body, a first external electrode disposed on a first end surface of the ceramic body and extending from the first end surface to cover a part of a first side surface of the ceramic body, a second external electrode disposed on a second end surface of the ceramic body and extending from the second end surface to cover a part of the first side surface, and a third external electrode disposed on the first side surface of the ceramic body and extending from the first side surface to cover parts of first and second main surfaces of the ceramic body. The ceramic body contains particular element that is at least one of alkali metal and alkaline earth metal. In a surface layer of the first side surface of the ceramic body, a first total concentration of the particular element in a vicinity of the first external electrode and in a vicinity of the second external electrode is different from a second total concentration of the particular element in a vicinity the third external electrode.