MLCC Interfacial Fe-Oxide Structure Against Hydrogen and Moisture
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Solution Overview
Problem
Hydrogen ions generated during the formation of Ni and Sn plating layers permeate into the internal electrodes and dielectric layers of multilayer ceramic capacitors, leading to insulation resistance deterioration and short defects, while external moisture permeates through glass erosion, reducing reliability.
Innovation Solution
Incorporating interfacial layers containing Fe oxide on the internal electrodes connected to the external electrodes to prevent hydrogen and moisture permeation, maintaining insulation resistance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Ni and Sn plating layers are formed on external electrodes for electrical connection and bonding, then electrical connectivity and bonding strength are improved, but hydrogen ions are generated that permeate into internal electrodes and dielectric layers causing insulation resistance deterioration and short defects
Solution Approach 1:
A glass layer is introduced as an intermediary substance between the external electrode and the internal electrode/dielectric layer. This glass layer acts as a barrier that prevents hydrogen ions generated during plating from permeating into the internal electrodes and dielectric layers, while still allowing the external electrode to maintain electrical connection and bonding with the body.
Solution Approach 2:
The external electrode structure is designed as a composite material system consisting of multiple layers: the plating layer (Ni and Sn) for electrical connection and bonding, and the glass layer for hydrogen barrier protection. This composite structure combines the advantages of different materials to achieve both strong bonding and high reliability.
2Strength
If glass is included in external electrode for bonding force with body, then bonding strength is improved, but glass has low corrosion resistance to plating solution causing erosion and moisture permeation paths
Solution Approach 1:
The external electrode is designed as a composite structure where the glass layer provides bonding force with the body while the plating layer (Ni and Sn) provides corrosion resistance to the plating solution. This composite material approach allows each layer to perform its optimal function without compromising the other.
Solution Approach 2:
The glass layer serves multiple functions: it provides bonding force between the external electrode and the body, acts as a hydrogen barrier, and when combined with the plating layer, achieves corrosion resistance. The plating layer simultaneously provides electrical conductivity, bonding strength, and protection against plating solution corrosion.
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 interfacial layers effectively block hydrogen and moisture, enhancing the reliability of multilayer ceramic capacitors by preventing deterioration and short defects.
Implementation Method 1
these hydrogen ions permeate into the internal electrodes and the dielectric layer, so that there was a problem in that insulation resistance is deteriorated or short defects occur
Implementation Method 2
external moisture permeates into the body through a moisture resistance path caused by the erosion of the glass, so that there was a problem in that reliability of the multilayer ceramic capacitor lowered
Data Source
AI summary
A multilayer electronic component is provided, the multilayer electronic component, including: a body including a dielectric layer and internal electrodes alternately disposed with the dielectric layer interposed therebetween in a first direction, the body having first and second surfaces opposing each other in the first direction, third and fourth surfaces connected to the first and second surfaces and opposing each other in a second direction, fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other in a third direction; and an external electrode disposed on the third and fourth surfaces of the body and connected to the internal electrodes. At least one of the internal electrodes includes an interfacial layer disposed on at least a portion of a region connected to the external electrode, and the interfacial layer includes an oxide containing Fe.