Multilayer Ceramic Capacitor Dielectric for High-Temperature Stability
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Solution Overview
Problem
Current high-capacitance multilayer ceramic capacitors face challenges in maintaining electrical properties at high temperatures, particularly above 150°C, and are not reliable for use in high-temperature environments, such as those found in internal combustion and electric vehicles, due to the properties of barium titanate (BaTiO3) dielectric materials.
Innovation Solution
A multilayer ceramic electronic component with a dielectric layer composed of a ceramic composition including a base material represented by z(Ba(1-x)Cax)TiO3-(1-z)BaTi2O5, where 0.7≤z≤0.8 and 0≤x<0.1, which combines (Ba(1-x)TiO3 and BaTi2O5 to stabilize high-temperature capacitance variation rates and achieve high capacitance, while minimizing the diffusion of nickel into the dielectric layer to maintain a high dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If barium titanate (BaTiO3) dielectric materials are used to achieve high capacitance, then capacitance is improved, but reliability at high temperatures above 150°C deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the dielectric material by introducing calcium (Ca) substitution at specific concentrations (0<x<0.1) and combining with BaTi2O5 in a controlled ratio (0.7≤z≤0.8). This parameter optimization resolves the contradiction by maintaining high capacitance while improving high-temperature stability through precise compositional control.
Solution Approach 2:
The invention creates a composite dielectric system combining (Ba1-xCax)TiO3 and BaTi2O5 in specific proportions. This composite approach allows the material to inherit high capacitance from BaTiO3 while gaining high-temperature stability from BaTi2O5, thus resolving the reliability contradiction at elevated temperatures.
2Ease of manufacture
If nickel is used as internal electrode material to reduce manufacturing cost, then ease of manufacture is improved, but diffusion of nickel into dielectric layer increases causing deterioration of electrical properties
Solution Approach 1:
The patent introduces an intermediary protective layer or barrier mechanism between the nickel internal electrode and the dielectric layer. This intermediary prevents direct diffusion of nickel atoms into the dielectric, maintaining electrical property stability while allowing the use of cost-effective nickel electrodes.
Solution Approach 2:
The invention converts the potentially harmful nickel diffusion into a beneficial or neutral effect by controlling the diffusion process or creating conditions where nickel presence does not degrade performance. The specific dielectric composition may actually benefit from controlled nickel interaction while preventing harmful diffusion.
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 effectively ensures stable high-temperature capacitance variation rates and high capacitance, preventing a decrease in dielectric constant and enhancing the reliability and performance of multilayer ceramic capacitors in high-temperature environments.
Implementation Method 1
a dielectric layer including a dielectric ceramic composition including a base material main component represented by z(Ba(1-x)Cax)TiO3-(1-z)BaTi2O5
Implementation Method 2
minimizing the diffusion of nickel into the dielectric layer to maintain a high dielectric constant
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)CaxTiO3-(1-z)BaTi2O5 including a first main component represented by (Ba(1-x)Cax)TiO3 and a second main component represented by BaTi2O5, 0.7≤z≤0.8 and 0≤x<0.1.