Multilayer Ceramic Capacitor Electrodes With XTiO3 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 disparity in sintering temperatures between conductive metal particles and ceramic dielectric layers.
Innovation Solution
Incorporating a ceramic component of XTiO3, where X is a conductive metal or alloy, into the inner electrodes to align the sintering temperatures and improve electrode coverage.
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 sintering temperature parameter by adding a ceramic material with a lower sintering temperature than the dielectric layer. This causes the inner electrode to sinter at a lower temperature first, then the dielectric layer sinters at its higher temperature, resulting in both achieving high coverage without requiring the inner electrode to be excessively thick.
Solution Approach 2:
The patent uses a composite material approach by incorporating a ceramic material into the inner electrode paste. This ceramic material has different sintering characteristics than the metal particles alone, enabling the inner electrode to maintain structural integrity and achieve high coverage at reduced thickness.
2Manufacturing precision
If the sintering temperature of conductive metal particles is increased to improve coverage, then the coverage increases, but the temperature difference with dielectric layer sintering increases
Solution Approach 1:
The patent introduces a ceramic material with intermediate sintering temperature characteristics between the metal particles and the dielectric layer. This creates a multi-stage sintering process where the ceramic material sinters first at a lower temperature, then the dielectric layer sinters at its higher temperature, achieving both high coverage and appropriate 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 inclusion of XTiO3 in the inner electrodes maintains high coverage even when the electrodes are thin, thereby enhancing the capacitance of the multilayer ceramic capacitors.
Implementation Method 1
In general, in the firing step during the manufacture of a multilayer ceramic capacitor, the temperature at which the conductive metal particles included in the conductive paste films to be the inner electrodes sinter is lower than the temperature at which the ceramic material that forms the dielectric layers sinters
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including ceramic dielectric layers stacked together and inner electrodes extending along interfaces between the dielectric layers. The inner electrodes include a conductive component including X and a ceramic component including XTiO3, where X represents a conductive metal or an alloy including a conductive metal.