MLCC Internal Electrode Carbon Paste for High-Temperature Reliability
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving miniaturization, high capacity, and high reliability due to limitations in internal electrode properties and high-temperature load performance.
Innovation Solution
The use of a conductive paste including a carbon material, such as carbon black, in the internal electrodes and on the interfacial surfaces between the dielectric layers and internal electrodes, which improves electrical properties and high-temperature load reliability by preventing coarse grain formation and maintaining uniformity of the dielectric composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive paste without carbon material is used in internal electrodes, then manufacturing process is simpler, but electrical properties and high-temperature load reliability are insufficient
Solution Approach 1:
The conductive paste is formulated as a composite material containing carbon particles (1-10 μm), metal particles (0.1-1 μm), and glass particles (1-10 μm). This composite structure provides both electrical conductivity and mechanical properties, enabling the internal electrode to maintain reliability under high-temperature loads while achieving miniaturization and high capacity
2Volume of moving object
If internal electrode thickness is reduced for miniaturization, then component size is reduced, but electrical conductivity and reliability deteriorate
Solution Approach 1:
The multi-component conductive paste creates a synergistic effect where carbon particles provide conductivity, metal particles enhance structural integrity, and glass particles fill voids. This composite structure maintains excellent electrical properties even in thinned internal electrodes, enabling miniaturization without sacrificing reliability
Solution Approach 2:
The conductive paste is applied with controlled particle size distribution and concentration optimization in the internal electrode regions. This local optimization ensures sufficient conductivity in thinned electrodes while maintaining overall component miniaturization
3Reliability
If sintering temperature is increased to improve electrode connectivity, then electrical properties improve, but coarse grain formation occurs in dielectric layers
Solution Approach 1:
The conductive paste formulation with specific particle size ranges (carbon: 1-10 μm, metal: 0.1-1 μm, glass: 1-10 μm) and optimized composition ratios enables effective electrode connectivity at controlled sintering temperatures. The glass particles act as flux to promote bonding without requiring excessive temperature that would cause dielectric grain coarsening
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 connectivity and smoothness of internal electrodes, improves electrical properties, and ensures excellent high-temperature load reliability, facilitating miniaturization and high capacity in ceramic electronic components.
Implementation Method 1
the carbon material may be be disposed in the internal electrode and/or on an interfacial surface between a dielectric layer and the internal electrode after sintering
Data Source
AI summary
A ceramic electronic component includes a body including a dielectric layer and an internal electrode; and an external electrode disposed on the body, wherein a first carbon material is disposed in the internal electrode. The first carbon material includes carbon black, which has conductivity, a substantially spherical shape, and a particle diameter of 0.05 μm or less.