Multilayer Ceramic Condenser Side Part Particle Size
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Solution Overview
Problem
Multilayer ceramic condensers face challenges in miniaturization and reliability due to residual stress between the multilayer main body and side parts, leading to cracks and deformation during the sintering process.
Innovation Solution
The method involves using ceramic dielectric powders with different particle diameters for the dielectric layers and side parts, with the side parts having a smaller particle diameter and higher BET specific surface area, allowing for simultaneous sintering and reducing residual stress, while maintaining the sintering temperature between 800 to 1200°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same ceramic dielectric powder is used for both the multilayer main body and side parts, then the manufacturing process is simple, but residual stress occurs during sintering leading to cracks and deformation
Solution Approach 1:
The patent applies different ceramic dielectric powders with different average particle diameters to different regions of the multilayer ceramic condenser. Specifically, the side parts use a powder with a smaller average particle diameter than the multilayer main body, creating local material property differences that enable differential sintering behavior and reduce residual stress between the main body and side parts.
2Reliability
If smaller particle diameter powder is used for side parts, then residual stress is reduced and reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the particle size parameter of the ceramic dielectric powder used in different regions. The side parts use powder with an average particle diameter of 0.5 to 2.0 μm, while the multilayer main body uses powder with an average particle diameter of 2.0 to 5.0 μm. This parameter differentiation allows controlled sintering behavior that reduces residual stress while maintaining manufacturability.
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 enhances the reliability and durability of the multilayer ceramic condenser by preventing cracks and deformation, enabling the production of high-capacity devices with improved reliability and capacitance.
Implementation Method 1
allowing for simultaneous sintering and reducing residual stress, while maintaining the sintering temperature between 800 to 1200°C
Data Source
AI summary
A multilayer ceramic condenser includes a multilayer main body, a first outer electrode, a second outer electrode, a first side part and a second side part. The multilayer main body has a first side, a second side, a third side and a fourth side. The multilayer main body includes a plurality of inner electrodes and a dielectric layer between the inner electrodes. The dielectric layer is formed by a first ceramic dielectric powder. The first side part and the second side part are formed on the second side and the fourth side of the multilayer main body, and formed by a second ceramic dielectric powder having a smaller particle diameter than the first ceramic dielectric powder. A mean grain size of the first side part or the second side part is similar to or smaller than that of the dielectric layer of the multilayer main body.