Multilayer Ceramic Capacitor Electrode Geometry for Cracking Prevention
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Solution Overview
Problem
Current multilayer ceramic capacitors face challenges in achieving high capacitance and reliability, particularly in miniaturized and high-frequency applications, due to limitations in electrode design and manufacturing processes that affect capacitance and lead to cracking issues during sintering.
Innovation Solution
A multilayer ceramic capacitor design with internal electrodes having specific thickness and shape ratios, and a manufacturing method involving conductive pastes with controlled ceramic additive content and particle sizes, ensuring 0.953≦a/b≦0.996, where a and b represent electrode distances, to enhance capacitance and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the internal electrode thickness is increased to improve capacitance, then the capacitance increases, but the manufacturing precision and reliability deteriorate due to cracking during sintering
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the internal electrode within the range of 0.05 μm to 0.2 μm, and controlling the a/b ratio within 0.953 to 0.996. These parameter optimizations allow the electrode to achieve sufficient capacitance while maintaining structural integrity during sintering, preventing cracking that would occur with thicker electrodes.
Solution Approach 2:
The patent introduces asymmetry by controlling the shape of the internal electrode such that the distance between electrodes measured at centers (a) and at edges (b) maintains a specific ratio. This asymmetric geometric control ensures uniform stress distribution during sintering, preventing cracking while maximizing capacitance through optimized electrode configuration.
2Reliability
If the internal electrode thickness is decreased to improve reliability, then cracking resistance improves, but the capacitance decreases
Solution Approach 1:
The patent optimizes the electrode thickness parameter within the specific range of 0.05 μm to 0.2 μm, finding the optimal balance point where capacitance is maximized without causing cracking. This parameter optimization allows thinner electrodes to achieve sufficient capacitance through improved uniformity and controlled a/b ratios, rather than simply reducing thickness.
Solution Approach 2:
The patent transitions from considering only electrode thickness to controlling the two-dimensional geometry by managing the a/b ratio. This dimensional approach allows optimization of electrode shape and distribution, enabling thinner electrodes to achieve equivalent or superior capacitance through improved geometric configuration and uniformity.
3Quantity of substance
If the a/b ratio is increased to improve capacitance distribution, then the capacitance increases, but the manufacturing precision deteriorates due to difficulty in controlling electrode shape
Solution Approach 1:
The patent establishes specific parameter ranges for the a/b ratio (0.953 to 0.996) and electrode thickness (0.05 μm to 0.2 μm) that are optimized for both capacitance and manufacturability. These parameter specifications provide clear manufacturing targets that balance capacitance performance with the practical constraints of electrode shape control during fabrication.
4Manufacturing precision
If the a/b ratio is decreased to improve manufacturing precision, then electrode shape control improves, but the capacitance decreases
Solution Approach 1:
The patent identifies the optimal parameter range where manufacturing precision and capacitance are simultaneously maximized. By setting the a/b ratio between 0.953 and 0.996 and thickness between 0.05 μm and 0.2 μm, the invention achieves the best compromise point where electrode shape is sufficiently controllable while capacitance remains high, avoiding the trade-off between precision and performance.
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 results in a multilayer ceramic capacitor with increased capacitance and improved reliability, effectively addressing the challenges of miniaturization and high-frequency performance while preventing cracking during the sintering process.
Implementation Method 1
sintering the multilayer chip to form a ceramic body including internal electrodes
Data Source
AI summary
There is provided a multilayer ceramic capacitor including: a ceramic body including dielectric layers; and a plurality of internal electrodes disposed within the ceramic body, having the dielectric layer interposed therebetween, wherein, on a cross section of the ceramic body in a width-thickness direction thereof, when a distance between an uppermost internal electrode and a lowermost internal electrode measured at centers thereof in a width direction thereof is defined as a and a distance between the uppermost internal electrode and the lowermost internal electrode measured at edges thereof in the width direction thereof is defined as b, 0.953≦a/b≦0.996 is satisfied.