Multilayer Ceramic Device Electrode Integrity
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Solution Overview
Problem
Multilayer ceramic electronic devices face reliability issues when dielectric layers are thinned, as thermal shrinkage differences can lead to spheroidization and disconnection of internal electrode layers, and existing techniques fail to prevent a decrease in reliability.
Innovation Solution
Incorporating a high content ratio of ceramic particles (2-15% by cross-sectional area) in the internal electrode layers, with a dielectric layer thickness of 0.5 μm or less, to reduce thickness variation and enhance coverage, thereby preventing composition deviations and maintaining original properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric layers are thinned to achieve downsizing and thinning of electronic equipment, then the device size is reduced, but the reliability decreases due to spheroidization and disconnection of internal electrode layers
Solution Approach 1:
Ceramic particles are introduced as intermediary substances within the internal electrode layers to act as spacers that prevent metal particle aggregation and maintain electrode layer integrity during thermal processing, thereby preventing spheroidization and disconnection while allowing thin dielectric layers
Solution Approach 2:
The invention changes the physical and chemical parameters of the internal electrode layers by incorporating ceramic particles with specific properties (size ratio relative to metal particles, thermal expansion coefficient matching), which modifies the thermal behavior and structural stability of the electrode layers during sintering of thin dielectric layers
2Reliability
If ceramic particles are contained in internal electrode layers to prevent spheroidization, then electrode layer integrity is improved, but the amount of ceramic particles discharged to dielectric layers increases causing composition deviation
Solution Approach 1:
The invention precisely controls parameters of ceramic particles including size (0.01-0.5 μm, preferably 0.03-0.1 μm), content ratio (2-15% by cross-sectional area), and thermal expansion coefficient (within ±5×10^-6/K of the dielectric layer) to optimize the balance between maintaining electrode integrity and minimizing particle discharge to dielectric layers
Solution Approach 2:
The ceramic particles are selectively distributed within the internal electrode layers at controlled concentrations, creating local structural reinforcement zones that prevent spheroidization while maintaining overall compositional stability of the dielectric layers through optimized particle placement and concentration
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
This approach improves high-temperature accelerated lifetime and reliability by maintaining a high coverage factor of internal electrode layers, reducing dielectric layer thickness variation, and preventing ceramic particle reaction with the dielectric material, thus ensuring enhanced reliability and performance.
Implementation Method 1
thermal shrinkage difference between the dielectric layers and the internal electrode layers following to sintering
Implementation Method 2
the ceramic particles are prevented from reacting with a dielectric material constituting the dielectric layers. This prevents a composition deviation caused by change in crystal structure of the dielectric layers
Data Source
AI summary
A multilayer ceramic electronic device includes a laminated body having alternately laminated internal electrode layers and dielectric layers. The dielectric layer has a thickness of 0.5 μm or less. The internal electrode layers contain ceramic particles. A content ratio of the ceramic particles contained in the internal electrode layer is 2 to 15% by representation of cross sectional area.