Multilayer Ceramic Capacitor Surface Roughness Optimization
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high flexural strength and reliability, particularly in miniaturized and integrated electronic components, where internal and external structures need improvement to withstand physical and chemical stress.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with dielectric layers and internal electrodes, where external electrodes are electrically connected to internal electrodes through conductive resin layers, and the surface roughness ratio (Ra*100/BW) is optimized to ≤1.0, enhancing interfacial adhesion and flexural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the multilayer ceramic capacitor is miniaturized to meet downsizing requirements, then the mounting integration is improved, but the flexural strength and reliability deteriorate
Solution Approach 1:
The patent applies local quality by creating a roughened surface layer specifically at the interface between the ceramic body and external electrodes. This localized surface treatment (through etching or coating) increases surface area and adhesion strength only where needed for electrode bonding, while the bulk ceramic material maintains its structural integrity and flexural strength even in miniaturized components.
Solution Approach 2:
The patent employs composite materials by combining the ceramic body with a roughened surface layer that has different properties from the bulk material. This surface layer, created through etching or coating processes, forms a composite structure that enhances interfacial adhesion between the ceramic and external electrodes, thereby improving reliability without requiring increased component size.
2Strength
If the surface roughness is increased to improve adhesion, then the interfacial bonding strength is improved, but the manufacturing precision deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the surface roughness within a specific quantitative range (Ra: 0.1-3.0 μm, with optimal range of 0.3-1.5 μm). This parameter optimization ensures sufficient adhesion enhancement while maintaining manufacturing feasibility. The roughness parameter is carefully balanced to provide adequate bonding surface area without creating excessive variability that would compromise manufacturing precision.
Solution Approach 2:
The patent introduces an intermediary roughened surface layer that mediates between the smooth ceramic body and the external electrodes. This intermediate layer, created through controlled etching or coating, provides a textured surface that enhances adhesion without requiring direct modification of the electrode materials or ceramic bulk, thereby isolating the manufacturing complexity to a manageable surface treatment process.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body including dielectric layers and a plurality of internal electrodes disposed to face each other with each of the dielectric layers interposed therebetween, and external electrodes disposed on external surfaces of the ceramic body and electrically connected to the internal electrodes, respectively. The external electrodes include electrode layers electrically connected to the internal electrodes and conductive resin layers disposed on the electrode layers, and the conductive layers are disposed to extend first and second surfaces of the ceramic body. When a distance from an outer edge of one of the first or second external electrodes disposed on a first or second surface to an inner edge thereof is defined as BW and surface roughness of the ceramic body is defined as Ra, a ratio of 100 times the surface roughness Ra to the distance BW (Ra*100/BW) satisfies (Ra*100/BW)≤1.0.