Multilayer Ceramic Capacitor Surface Roughness for Warpage and Moisture Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high reliability and strength properties, particularly in withstanding external impacts and maintaining moisture resistance and warpage strength, as existing dual-layer electrode structures are insufficient for modern electronic devices with high power and miniaturization demands.
Innovation Solution
A multilayer electronic component design featuring a dielectric layer with alternately layered internal electrodes, where the surface roughness of the electrode layers is greater than that of the conductive resin layers, enhancing the cohesion force and preventing peeling or oxidation, thus improving moisture resistance and warpage strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual layer structure including an electrode layer and a conductive resin layer is used, then reliability and strength properties are improved, but cohesion force between the body and electrode layer is insufficient
Solution Approach 1:
The patent changes the surface roughness parameter of the dielectric layer to resolve the contradiction. Specifically, the dielectric layer is designed with a first surface roughness (R1) in a range of 0.5 μm to 3.0 μm, which is greater than the second surface roughness (R2) of the capacitance forming portion surface (0.1 μm to 0.5 μm). This parameter change in surface roughness enhances the mechanical interlocking between the electrode layer and the dielectric layer, thereby improving cohesion force while maintaining reliability.
Solution Approach 2:
The patent employs a composite structure where the dielectric layer and the electrode layer form an integrated composite material system. The dielectric layer serves multiple functions: it provides electrical insulation, mechanical support, and enhanced adhesion through its controlled surface roughness. This composite approach allows the structure to simultaneously achieve high reliability and strong cohesion force between layers.
2Volume of moving object
If the capacitor is miniaturized for high power applications, then device size is reduced, but warpage strength properties deteriorate
Solution Approach 1:
The patent controls the surface roughness parameter of the dielectric layer to compensate for the reduced structural margin in miniaturized devices. By setting the first surface roughness (R1) to 0.5 μm to 3.0 μm, the enhanced mechanical interlocking provides additional structural reinforcement that counteracts the tendency toward warpage in small-sized, high-power capacitors, thereby maintaining warpage strength properties despite miniaturization.
Solution Approach 2:
The patent introduces surface curvature through controlled roughness on the dielectric layer. This micro-scale curvature and roughness profile create a mechanically robust interface that resists warpage deformation, allowing miniaturized capacitors to maintain structural integrity and warpage strength despite their reduced overall dimensions.
3Volume of moving object
If the capacitor is miniaturized for high power applications, then device size is reduced, but moisture resistance reliability deteriorates
Solution Approach 1:
The patent modifies the surface roughness parameter of the dielectric layer to enhance moisture resistance in miniaturized capacitors. The increased surface roughness (R1 = 0.5 μm to 3.0 μm) creates a more effective barrier against moisture penetration by reducing direct contact areas and creating tortuous paths for moisture diffusion, thereby improving moisture resistance reliability despite the reduced device size.
Solution Approach 2:
The dielectric layer functions as a protective thin film structure that provides moisture barrier properties. Through controlled surface roughness, this thin film creates a more effective moisture barrier in miniaturized devices, preventing moisture ingress and maintaining reliability despite the smaller overall dimensions that would otherwise be more susceptible to environmental degradation.
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 design effectively enhances the cohesion force between the body and electrode layers, improving moisture resistance and warpage strength properties, reducing the risk of insulation degradation and shorts, while maintaining the miniaturization and high-capacity requirements of modern electronic devices.
Implementation Method 1
cohesion force between a body and an electrode layer is improved
Implementation Method 2
the dual layer structure may absorb external impacts and may prevent permeation of a plating solution, thereby improving reliability
Implementation Method 3
the dual layer structure may absorb external impacts and may prevent permeation of a plating solution, thereby improving reliability
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and first and second internal electrodes, and including first to sixth surfaces, a first external electrode including a first electrode layer extending to a portion of each of the first, second, fifth, and sixth surfaces and a first conductive resin layer, and a second external electrode including a second electrode layer extending to a portion of each of the first, second, fifth, and sixth surfaces and a second conductive resin layer. R1 and R2 satisfy R1>R2, in which R1 is defined as a surface roughness of each of the first, second, fifth, and sixth surfaces in contact with the first and second electrode layers, and R2 is defined as a surface roughness of each of the first, second, fifth, and sixth surfaces in contact with the first and second conductive resin layers.