MLCC External Electrode Resin Composition Against Oxidation Defects
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) for electronic products face issues with lifting and bursting defects of external electrodes due to oxidation of the conductive resin layer, leading to decreased adhesive strength between the ceramic body and electrode layer.
Innovation Solution
The MLCCs incorporate a conductive resin layer comprising a bisphenol A-based resin and a biphenyl-based resin, with specific ratios and FT-IR analysis parameters to control the aromatic ring and alcohol peak intensities, thereby suppressing oxidation and enhancing adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive resin layer is applied to the electrode layer to improve bending strength and prevent plating solution penetration, then reliability is improved, but oxidation of the resin causes adhesive strength to decrease and lifting/bursting defects to occur
Solution Approach 1:
The patent changes the chemical composition parameters of the conductive resin layer by incorporating a specific glass component with controlled softening point and chemical composition. This parameter modification suppresses resin oxidation while maintaining adhesive strength, resolving the contradiction between reliability improvement and adhesive strength preservation
Solution Approach 2:
The patent creates a composite conductive resin layer combining conductive material, resin, and specifically formulated glass component. This composite structure provides both the protective function (improving reliability) and maintains adhesive properties, preventing the oxidation-induced strength loss while preserving the protective benefits
2Strength
If a conductive resin layer is applied to the electrode layer to absorb external impacts, then bending strength is improved, but gas by-products cause lifting and bursting defects
Solution Approach 1:
The patent modifies the thermal and chemical parameters of the conductive resin layer by adding glass with controlled softening point (600-900°C) and specific composition. This change allows the layer to absorb impacts effectively while suppressing gas by-product formation that causes lifting and bursting defects
Solution Approach 2:
The patent converts the potential harmful effect of resin oxidation and gas by-product formation into a beneficial process by controlling the glass component's decomposition behavior. The glass component manages gas evolution in a controlled manner, transforming what would be harmful gas accumulation into a controlled process that maintains structural integrity
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
This approach effectively suppresses lifting and bursting defects of external electrodes while securing excellent adhesive strength, ensuring reliable performance under stress conditions.
Implementation Method 1
since the resin of the conductive resin layer is oxidized, an adhesive strength between a ceramic body and an electrode layer may be decreased
Implementation Method 2
on a biaxial graph including a relationship curve illustrating a relationship of spectrum intensity to a wave number of the conductive resin layer obtained by FT-IR analysis
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A multilayer electronic component includes: a body and an external electrode disposed on the body, wherein the external electrode includes a conductive resin layer containing a bisphenol A-based resin and a biphenyl-based resin with a specific mixing ratio (e.g., a ratio of a content of the biphenyl-based resin with respect to a total content is 10 wt% or more and 50 wt% or less) . Such a resin mixing ratio between the bisphenol A-based resin and the biphenyl-based resin can lead to 0.337 ≤ 2*C/A ≤ 0.367 or 0.048 ≤ B/A ≤ 0.14, with an aromatic ring peak intensity (A), a carbonyl peak intensity (B), and an alcohol peak intensity (C) in a Fourier transform infrared spectroscopy (FT-IR) analysis. The multilayer electronic component showing such peak intensity characteristics can suppress oxidation of a conductive resin layer while also securing excellent adhesive strength of the conductive resin layer.