Multilayer Ceramic Capacitor Electrodes for Thin-Layer Coverage
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving high capacitance due to reduced coverage of thin-layer inner electrodes, which is exacerbated by the temperature disparity between the sintering of conductive metal particles and ceramic dielectric layers during manufacturing.
Innovation Solution
Incorporating AgTiO3, EuTiO3, or NaTiO3 into the inner electrodes, which have an ilmenite crystal structure, to improve coverage and maintain high capacitance even when formed as thin layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of inner electrodes is reduced to increase capacitance, then the capacitance increases, but the coverage of inner electrodes decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the conductive paste by incorporating specific ceramic materials (BaTiO3, SrTiO3, Pb(Zr,Ti)O3) with controlled particle sizes and ratios. This modifies the sintering behavior of the metal particles, enabling them to maintain high coverage even when the inner electrode layer thickness is reduced to 1 μm or less.
Solution Approach 2:
The patent creates a composite conductive paste material combining conductive metal particles (silver, copper) with specific ceramic particles (BaTiO3, SrTiO3, Pb(Zr,Ti)O3). This composite structure allows the metal particles to be supported by the ceramic matrix during sintering, preventing coverage reduction while maintaining thin layer thickness for high capacitance.
2Manufacturing precision
If the sintering temperature of metal particles is increased to improve coverage, then the coverage increases, but the temperature difference between metal sintering and ceramic sintering decreases
Solution Approach 1:
The patent modifies the sintering temperature parameter of the conductive paste by incorporating ceramic materials with specific thermal properties. BaTiO3, SrTiO3, and Pb(Zr,Ti)O3 have higher sintering temperatures than the metal particles, which raises the overall sintering temperature of the conductive paste, thereby improving metal particle coverage while controlling the temperature differential.
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 use of AgTiO3, EuTiO3, or NaTiO3 in the inner electrodes ensures high coverage and increased capacitance by moderating the sintering process, allowing the inner electrodes to maintain integrity and performance.
Implementation Method 1
the sintering temperature of conductive metal particles included in conductive paste films that are to be the inner electrodes is lower than the sintering temperature of the ceramic that forms the dielectric layers, which means that the metal particles included in the inner electrodes are sintered first
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers made of ceramic and stacked together, and inner electrodes arranged along multiple interfaces between the dielectric layers, with each inner electrode extending along a respective interface. The inner electrodes include silver as a conductive material and also include at least one of AgTiO3, EuTiO3, or NaTiO3.