MLCC Dielectric Composition for High-Temperature Capacitance Stability
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Solution Overview
Problem
Existing high-capacitance multilayer ceramic capacitors face challenges in maintaining electrical properties at high temperatures, particularly above 150°C, which limits their reliability and functionality in applications such as vehicle electronics and infotainment systems.
Innovation Solution
The development of a multilayer ceramic electronic component with a dielectric layer composed of a ceramic composition including z(Ba(1-x)Cax)TiO3-(1-z)BaTi2O5, where 0.7≤z≤0.8 and 0≤x<0.1, which stabilizes high-temperature capacitance variation rates while maintaining high capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional dielectric materials are used to achieve high capacitance, then capacitance value is improved, but high-temperature electrical properties deteriorate
Solution Approach 1:
The patent employs a composite dielectric material system comprising multiple ceramic phases including barium titanate (BaTiO3), calcium barium titanate (Ca1-xBaxTiO3), and other auxiliary oxides. This composite structure allows the material to achieve high capacitance through the ferroelectric properties of BaTiO3 while maintaining thermal stability through the complementary phases, thereby resolving the contradiction between high capacitance and high-temperature reliability
Solution Approach 2:
The patent optimizes the chemical composition parameters of the dielectric material by precisely controlling the ratios of Ba, Ca, Ti, and other elements, as well as the particle size distribution and sintering temperature parameters. These parameter changes enable the material to achieve both high capacitance and stable electrical properties at elevated temperatures up to 150°C
2Quantity of substance
If dielectric layer composition is optimized for high capacitance, then capacitance value is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the dielectric layer into multiple functional zones or phases within the composite material structure, where each phase serves a specific function (e.g., BaTiO3 for high capacitance, Ca1-xBaxTiO3 for thermal stability). This segmentation allows the complex composition to be managed through standardized manufacturing processes for each phase while achieving the desired high capacitance performance
Data Source
AI summary
A multilayer ceramic electronic component includes: a ceramic body including dielectric layers and a plurality of first and second internal electrodes disposed on the dielectric layers to face each other with each of the dielectric layers interposed therebetween; and first and second external electrodes disposed on external surfaces of the ceramic body and electrically connected to the first and second internal electrodes, wherein the dielectric layer includes a dielectric ceramic composition including a base material main component represented by z(Ba(1-x)Ca.)TiO3-(1-z)BaTi205 including a first main component represented by (Ba(1-x)Ca.)TiO3 and a second main component represented by BaTi2O5, 0.7z0.8 and 0≤x<0.1.