Dielectric Ceramic Composition for High Voltage MLCCs
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Solution Overview
Problem
Multilayer ceramic capacitors used at high voltage face decreased specific permittivity and insulation resistance under high electric field intensity, affecting their capacity and reliability, with existing dielectric ceramic compositions not adequately addressing these issues.
Innovation Solution
A dielectric ceramic composition comprising a perovskite type compound with specific ratios of rare earth oxides, magnesium oxides, and transition metal oxides, along with a sintering agent, to enhance insulation resistance and high-temperature accelerated lifetime, maintaining good specific permittivity and improving IR characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric field intensity becomes higher to achieve high voltage operation, then the capacitor can be used for high power applications, but the specific permittivity and insulation resistance decrease
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric ceramic by incorporating specific ratios of rare earth oxides (8-20 mol%), MgO (3-15 mol%), and transition metal oxides (0.6-2.0 mol%) into the BaTiO3-based perovskite structure. This compositional parameter adjustment maintains high insulation resistance even under high electric field intensity, enabling the capacitor to operate reliably at high voltages without the performance degradation typically observed in conventional materials.
2Power
If the electric field intensity becomes higher to achieve high voltage operation, then the capacitor can be used for high power applications, but the specific permittivity decreases
Solution Approach 1:
The patent creates a composite dielectric material system based on BaTiO3 perovskite structure, integrating multiple oxide components (rare earth oxides, MgO, transition metal oxides) in specific proportions. This composite approach synergistically combines the high permittivity of BaTiO3 with the stabilizing effects of dopants, maintaining excellent specific permittivity even under high electric field conditions where conventional single-component materials would fail.
3Ease of manufacture
If conventional dielectric ceramic compositions are used to simplify material selection, then the manufacturing process is easier, but the IR characteristic and high temperature accelerated lifetime are insufficient
Solution Approach 1:
The patent specifies precise compositional parameters: rare earth oxides (8-20 mol%), MgO (3-15 mol%), transition metal oxides (0.6-2.0 mol%), and controls the ratio R/(M+N) between 1.0-3.0. These parameter specifications, while detailed, provide clear manufacturing guidelines that balance the complexity of material selection with the need for superior IR characteristics and high temperature accelerated lifetime, achieving reliability that conventional compositions cannot provide.
4Ease of manufacture
If conventional dielectric ceramic compositions are used to simplify material selection, then the manufacturing process is easier, but the high temperature accelerated lifetime is insufficient
Solution Approach 1:
The patent develops a composite dielectric ceramic system incorporating rare earth oxides, MgO, and transition metal oxides within the BaTiO3 perovskite structure. This multi-component composite material provides enhanced thermal stability and resistance to degradation mechanisms at high temperatures, significantly extending the high temperature accelerated lifetime compared to conventional single-phase dielectrics, while maintaining manufacturability through defined compositional ranges.
Data Source
AI summary
The object of the present invention is to provide the dielectric ceramic composition having good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition according to the present invention comprises a main component comprising a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, said “m”, “x”, “y” and “z” all show a mol ratio, and each satisfies 0.94≤m≤1.1, 0≤x≤0.2, 0≤y≤0.2, 0.06≤z<0.2),a first sub component comprising oxides of a rare earth element R (note that, R is any one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu),a second sub component comprising oxides of Mg,a third sub component comprising oxides at least one element M selected from the group consisting of Mn, Cr, Co and Fe,a fourth sub component as a sintering agent,a ratio of the first sub component in terms of oxides (RO3/2) is 8 to 20 mol, a ratio of the second sub component in terms of oxides (MgO) is 3 to 15 mol, a ratio of the third sub component in terms of oxides (MO) is 0.6 to 2.0 mol, with respect to 100 mol of said main component; andwhen a content of the first sub component is R mol, a content of the second sub component is M mol, and a content of the third sub component is N mol with respect to 100 mol of said main component, then 1.0≤R/(M+N)<2.4 is satisfied.