MLCC Dielectric Composition for Low Leakage and High Reliability
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Solution Overview
Problem
Conventional multilayered ceramic capacitors using barium titanate-based dielectric materials face issues with reliability and performance, particularly in high-performance electronic components, such as those in evolving automotive electronics, due to limitations in lifespan, equivalent series resistance, leakage current, quality factor, and DC insulation resistance.
Innovation Solution
A dielectric composition comprising a barium-based compound, gadolinium oxide, manganese oxide, and magnesium carbonate, with specific molar ratios and particle size conditions, is used to enhance the reliability and performance of multilayered ceramic capacitors, including a manufacturing method that involves preparing a ceramic slurry with a binder and organic solvent, followed by sintering and electrode formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barium titanate-based dielectric material is used in conventional multilayered ceramic capacitors, then high dielectric constant and good insulation resistance are achieved at room temperature, but reliability and performance deteriorate in evolving electronic applications
Solution Approach 1:
The patent uses a composite dielectric material system consisting of barium zirconate (BaZrO3) and barium titanate (BaTiO3) in a specific molar ratio range (1:2 to 6). This composite approach combines the high dielectric constant of BaTiO3 with the stability and reliability benefits of BaZrO3, resolving the contradiction between maintaining high dielectric performance and improving reliability in modern electronic applications
2Reliability
If conventional dielectric materials and manufacturing methods are used, then manufacturing simplicity is maintained, but equivalent series resistance and leakage current performance are insufficient
Solution Approach 1:
The patent optimizes specific parameters including the molar ratio of BaZrO3 to BaTiO3 (1:2 to 6), particle size distribution (D10≤60nm, 150nm≤D50≤350nm, D90≤2000nm), and ratios of additives (Gd2O3: 2-6 mole parts, Mn3O4: 0.01-1 mole part, MgCO3: 2-6 mole parts based on 100 mole parts of barium-based compound). These parameter optimizations improve electrical performance while maintaining manufacturing feasibility
3Reliability
If existing dielectric compositions are used, then manufacturing process simplicity is maintained, but quality factor and DC insulation resistance are insufficient for high-performance applications
Solution Approach 1:
The patent introduces localized quality improvements through specific additive components: gadolinium oxide (Gd2O3) for grain boundary control and quality factor enhancement, manganese oxide (Mn3O4) for insulation resistance improvement, and magnesium carbonate (MgCO3) for microstructure optimization. Each additive targets specific local properties to achieve overall performance enhancement
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 proposed dielectric composition results in multilayered ceramic capacitors with improved lifespan reliability, low equivalent series resistance, high quality factor, and enhanced DC insulation resistance, outperforming existing capacitors in terms of temperature stability and leakage current characteristics.
Implementation Method 1
A dielectric composition for a multilayered ceramic capacitor, including a barium-based compound, gadolinium oxide (Gd2O3), manganese oxide (Mn3O4) and magnesium carbonate (MgCO3)
Implementation Method 2
the dielectric composition may include 2 to 6 mole parts of gadolinium oxide (Gd2O3), 0.01 to 1 mole part of manganese oxide (Mn3O4) powder and 2 to 6 mole parts of magnesium carbonate (MgCO3), based on 100 mole parts of a barium-based compound
Implementation Method 3
a fifth step of manufacturing a capacitor body by performing a debinding process and a sintering process on the green chip
Data Source
AI summary
A dielectric composition for a multilayered ceramic capacitor is provided, the multilayered ceramic capacitor includes the same, and a manufacturing method for the capacitor is also provided. The dielectric composition for a multilayered ceramic capacitor includes a barium-based compound, gadolinium oxide (Gd2O3), manganese oxide (Mn3O4), and magnesium carbonate (MgCO3). Accordingly, the dielectric composition is excellent in performance as well as reliability.