Multilayer Ceramic Capacitor Additive Gradient Pore Elimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic electronic components face challenges in achieving high reliability due to the presence of pores in the capacitor body and varying degrees of densification, which affect moisture resistance and withstand voltage characteristics.
Innovation Solution
A multilayer ceramic electronic component design where the concentration of an additive element is higher in the margin parts than in the active region, with a concentration gradient from the surface towards the active region, enhancing the reliability and moisture resistance by adjusting the densification levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor body is densified to improve reliability, then moisture resistance improves, but manufacturing complexity increases due to need for controlled additive distribution
Solution Approach 1:
The patent applies local quality by creating different additive element concentrations in different regions of the capacitor body. The margin part has a higher concentration of additive elements compared to the active region, which locally enhances densification and moisture resistance where it is most needed without affecting the electrical performance of the active region.
Solution Approach 2:
The patent implements preliminary action by incorporating the additive elements into the green sheets before the stacking and sintering process. The additive elements are mixed with the ceramic powder in the green sheet formulation, ensuring they are distributed in the margin parts before densification occurs during sintering, thereby preventing pore formation in advance.
2Reliability
If pores are eliminated from the capacitor body to improve reliability, then moisture resistance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating different additive element concentrations in different regions of the capacitor body. The margin part has a higher concentration of additive elements compared to the active region, which locally enhances densification and moisture resistance where it is most needed without affecting the electrical performance of the active region.
Solution Approach 2:
The patent implements parameter changes by modifying the additive element concentration as a function of position within the capacitor body. By varying the concentration parameter from the active region to the margin part, the sintering behavior and densification are controlled differently in each region, eliminating pores in the margin part while maintaining proper densification in the active region.
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 approach results in improved reliability and moisture resistance of the multilayer ceramic electronic components by optimizing the densification and additive element distribution, effectively addressing the issues of pore presence and varying densification.
Implementation Method 1
a concentration gradient of the additive element from a surface of the capacitor body toward an active region
Data Source
AI summary
A multilayer ceramic electronic component includes: a capacitor body including a plurality of dielectric layers and a plurality of internal electrodes; with external electrodes disposed on the capacitor body and electrically connected to the internal electrodes, wherein the capacitor body includes an active region in which internal electrodes having different polarities from each other overlap each other to form capacitance, and a margin part defined as region except for the active region. A concentration of an additive element in the margin part is higher than the concentration of the additive element in the active region, and the margin part has a concentration gradient of the additive element from a surface of the capacitor body toward the active region.