Multilayer Ceramic Capacitor Electrode-End Structure for Field Relief
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Solution Overview
Problem
Existing multilayer ceramic capacitors face reliability issues due to electric field concentration at the ends of internal electrodes, which is not effectively addressed by current manufacturing methods that do not optimize the composition of dielectric laminated sheets and ceramic pastes for level difference elimination.
Innovation Solution
A multilayer ceramic capacitor design that includes a specific arrangement of dielectric ceramic layers and internal electrode layers, with a second alloy portion made of metal elements like Sn, In, Ga, Zn, Bi, Pb, Cu, Ag, Pd, Pt, Ph, Ir, Ru, Os, Fe, V, and Y between the dielectric ceramic layers and internal electrode layers to reduce electric field concentration, and a third dielectric ceramic layer with varying compositions to enhance sinterability and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the side margin is reduced to increase the area of internal electrode layers, then the capacitance is improved, but the reliability is degraded due to electric field concentration at the ends of internal electrodes
Solution Approach 1:
The patent applies local quality by introducing a second dielectric ceramic layer with different composition and properties specifically at the end portions of internal electrodes where electric field concentration occurs. This localized modification allows the side margin thickness to be reduced for higher capacitance while the specialized dielectric layer at critical locations prevents reliability degradation by suppressing electric field concentration.
Solution Approach 2:
The patent uses composite materials by combining a first dielectric ceramic layer (standard composition) with a second dielectric ceramic layer (different composition containing specific metal elements). This composite structure allows the bulk material to provide high capacitance through reduced side margins, while the second dielectric ceramic layer provides reliability enhancement by addressing electric field concentration at electrode ends.
2Ease of manufacture
If conventional ceramic paste is used for level difference elimination, then the manufacturing process is simple, but the reliability is degraded due to electric field concentration that cannot be suppressed
Solution Approach 1:
The patent applies parameter changes by modifying the composition of the second dielectric ceramic layer to include specific metal elements (Sn, In, Ga, Zn, Bi, Pb, Cu, Ag, Pd, Pt, Ph, Ir, Ru, Os, Fe, V, or Y) at controlled concentrations. This compositional parameter change enables the material to suppress electric field concentration effectively, improving reliability while maintaining manufacturing feasibility through established ceramic processing techniques.
3Quantity of substance
If the area of internal electrode layers is increased by reducing side margin thickness, then the capacitance is improved, but the electric field concentration at electrode ends is exacerbated
Solution Approach 1:
The patent introduces a second dielectric ceramic layer as an intermediary material between the internal electrode layers and the surrounding environment. This intermediary layer, with its specific composition containing metal elements, acts to distribute and reduce electric field concentration at the electrode ends, allowing the electrode area to be maximized for higher capacitance without suffering from harmful electric field concentration effects.
Data Source
AI summary
A multilayer ceramic capacitor includes a second alloy portion including one metal element provided in a greatest amount among metal elements of an internal electrode layer, and one or more metal elements among a metal group including Sn, In, Ga, Zn, Bi, Pb, Cu, Ag, Pd, Pt, Ph, Ir, Ru, Os, Fe, V, and Y is provided between a second dielectric ceramic layer and a first internal electrode layer, and between a second dielectric ceramic layer and a second internal electrode layer, respectively.