Multilayer Ceramic Capacitor Composition for 200°C Reliability
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Solution Overview
Problem
Existing multi-layered ceramic capacitors face challenges in maintaining high reliability and capacity, particularly in high-temperature environments, due to the reduction in electrostatic capacity and dielectric breakdown voltage when exposed to temperatures above 150°C, which limits their use in vehicles and infotainment systems.
Innovation Solution
A dielectric ceramic composition is developed using (Ba1-xCax)TiO3 as the main component, with specific accessory components like Y, Mg, Ba or Zr, Mn, Ni, W, V, Fe, and Si, to stabilize high-temperature capacity and improve dielectric breakdown voltage by controlling the thickness ratio of the dielectric layer to internal electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-layered ceramic capacitors are used, then they can be mounted on printed circuit boards and serve to charge or discharge electricity, but their electrostatic capacity and dielectric breakdown voltage reduce when exposed to temperatures above 150°C
Solution Approach 1:
The patent modifies the dielectric ceramic composition by adjusting the ratio of barium titanate to calcium titanate and adding specific accessory components (Y, Mg, Ba, Zr, Mn, Ni, W, V, Fe, Si) with controlled content ranges. This changes the material parameters to maintain stable electrostatic capacity and dielectric breakdown voltage at temperatures up to 200°C, directly resolving the temperature stability issue while improving high-temperature reliability
Solution Approach 2:
The patent creates a composite dielectric material system combining multiple metal oxides (BaTiO3, CaTiO3, and accessory components) with specific compositional ratios. This composite structure leverages the synergistic effects of different materials to achieve both high electrostatic capacity and thermal stability, preventing capacity reduction at elevated temperatures
2Quantity of substance
If the dielectric layer thickness is reduced to increase capacity density, then miniaturization is achieved, but dielectric breakdown voltage decreases
Solution Approach 1:
The patent optimizes the dielectric layer thickness and internal electrode thickness ratio, along with modifying the dielectric ceramic composition. This dual approach allows reduction of dielectric layer thickness to increase capacity density while the enhanced material composition compensates for the reduced thickness, maintaining adequate dielectric breakdown voltage through improved material properties rather than relying solely on geometric dimensions
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 solution ensures stable high-temperature capacity and dielectric breakdown voltage, enabling reliable operation up to 200°C, thereby meeting the demands of electronic control systems in vehicles and infotainment systems.
Implementation Method 1
the dielectric layer comprises a dielectric ceramic composition containing: a base material represented by (Ba1-xCax)TiO3
Implementation Method 2
improve dielectric breakdown voltage by controlling the thickness ratio of the dielectric layer to internal electrodes
Data Source
AI summary
A multi-layered ceramic electronic component includes a ceramic body including a dielectric layer, and a plurality of first and second internal electrodes opposing each other with the dielectric layer interposed therebetween; and first and second external electrodes arranged outside of the ceramic body and electrically connected to the first and second internal electrodes, wherein the dielectric layer comprises a dielectric ceramic composition containing: a base material represented by (Ba1-xCax)TiO3 (0<x≤0.09) as a main component, Y as a first accessory component, Mg as a second accessory component, Ba or Zr, or a mixture thereof, as a third accessory component, Mn, Ni, W, V, or Fe, or mixtures thereof, as a fourth accessory component, and Si as a fifth accessory component.