Multilayer Ceramic Component Interface with Nd-Graded Adhesion
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Solution Overview
Problem
Existing multilayer ceramic electronic components face issues with adhesion strength between ceramic layers and electrodes, leading to potential deformation and structural reliability concerns due to intensive interdiffusion during firing.
Innovation Solution
Incorporating a Nd uneven distribution portion in the ceramic layer at the interface with the electrode, where Nd is unevenly distributed, to enhance adhesion strength without relying on material interdiffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a component common to the ceramic layer is added to the internal electrode to reduce interdiffusion difference, then adhesion between different types of ceramics is improved, but adhesion strength between the ceramics and the internal electrode decreases
Solution Approach 1:
The patent applies local quality by creating a Nd uneven distribution portion specifically at the interface between the ceramic layer and electrode, rather than uniformly distributing Nd throughout the ceramic layer. This localized concentration of Nd at the interface region enhances adhesion strength between the ceramic layer and electrode while maintaining the overall ceramic structure integrity, thereby resolving the contradiction between improving ceramic-to-ceramic adhesion and maintaining electrode-to-ceramic adhesion strength.
2Ease of manufacture
If ceramic layers and internal electrode are simultaneously fired, then manufacturing process is simplified, but intensive interdiffusion occurs at portions with no internal electrode causing deformation
Solution Approach 1:
The patent applies preliminary anti-action by adding MnO to the ceramic layer composition before firing. MnO acts as a diffusion inhibitor that prevents intensive interdiffusion between ceramic layers during the simultaneous firing process. This preliminary addition of diffusion-controlling material allows the ceramic layers and internal electrode to be fired together (maintaining manufacturing simplicity) while preventing the deformation that would otherwise occur at portions with no internal electrode (maintaining manufacturing precision).
Data Source
AI summary
A multilayer ceramic electronic component that includes: a ceramic layer that contains a Ba—Nd—Ti oxide, forsterite, barium borosilicate glass, and MnO; and an electrode in contact with the ceramic layer, wherein the ceramic layer includes a Nd uneven distribution portion where Nd is unevenly distributed at an interface where the ceramic layer is in contact with the electrode.