Dielectric Composition Ge Oxide Voltage Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors used in automotive applications face challenges with high temperature accelerated lifetime and voltage resistance, particularly when exposed to AC voltage over long periods, and existing dielectric compositions either lack sufficient permittivity or suffer from insulation resistance degradation.
Innovation Solution
A dielectric composition with a main component expressed by the chemical formula (A6-xBxCx+2D8-xO30) and incorporating specific oxides such as Ge, V, Mn, Mg, and other elements, which forms a tungsten-bronze type crystal structure, enhancing voltage resistance and specific resistivity while maintaining high temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric ceramic composition with perovskite structure and tungsten-bronze structure is used to achieve sufficient permittivity and stable capacitance temperature characteristic, then the specific resistivity is improved at high temperature, but the high temperature accelerated lifetime becomes insufficient when AC voltage is applied continuously
Solution Approach 1:
The patent changes the chemical composition parameters by introducing Ge oxide as a first sub component (2.5-20 mol%) and V oxide as a second sub component (0.1-5 mol%) in the dielectric ceramic composition with formula (A6-xBxCx+2D8-xO30), which modifies the material properties to achieve both high specific resistivity and long accelerated lifetime under AC voltage at high temperature
Solution Approach 2:
The patent creates a composite dielectric material system combining the main component (A6-xBxCx+2D8-xO30 with tungsten-bronze structure) and multiple sub components (Ge oxide, V oxide, and other oxides), where the synergistic interaction between components provides both high specific resistivity and excellent high temperature accelerated lifetime
2Reliability
If various sub components are included to improve insulation property at room temperature, then the insulation property is improved, but the high temperature accelerated lifetime at high temperature range becomes insufficient
Solution Approach 1:
The patent applies local quality by introducing specific sub components (Ge oxide and V oxide) in controlled amounts to target specific performance aspects: Ge oxide primarily enhances specific resistivity while V oxide contributes to both insulation property and high temperature stability, creating localized functional improvements within the composite material
3Duration of action of stationary object
If barium titanate based material with sub components like Ge is used to achieve high temperature accelerated lifetime, then the high temperature accelerated lifetime is improved, but the specific permittivity becomes low at temperature higher than 150°C
Solution Approach 1:
The patent merges the advantages of different material systems by combining the perovskite-based main component (A6-xBxCx+2D8-xO30) with Ge oxide and V oxide sub components, integrating the high temperature stability of perovskite with the permittivity enhancement from Ge and the stability improvement from V, achieving both high specific permittivity and long accelerated lifetime
Data Source
AI summary
A dielectric composition comprising a main component expressed by a chemical formula of (A6-xBxCx+2D8-xO30, 0≤x≤5), wherein said “A” component is at least one element selected form the group consisting of Ba, Ca, and Sr, said “B” component is at least one element selected from the group consisting of Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, said “C” component is at least one element selected from the group consisting of Ti, and Zr, said “D” component is at least one element selected from the group consisting of Nb, and Ta, and said dielectric composition comprises 2.50 mol or more and 20.00 mol or less of an oxide of Ge as a first sub component with respect to 100 mol of said main component.