MLCC Magnesium Gradient Structure for Moisture Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reduction in dielectric layer thickness of MLCCs to improve capacity leads to compromised moisture resistance reliability due to thinner cover and margin portions.
Innovation Solution
A capacitor component design with specific magnesium content and porosity ratios in its active, cover, and margin portions, ensuring 0<A1<M1≤C1 and A1/C1≤0.60, and A2/C2≤0.003, where A1, M1, C1, A2, and C2 represent magnesium content and porosity in these regions, enhancing moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dielectric layer is thinned to improve capacity, then the capacity is improved, but the thicknesses of the cover portion and the margin portion are reduced, which reduces moisture resistance reliability
Solution Approach 1:
The patent applies different magnesium oxide content ranges to different portions of the capacitor component. The active portion contains 0.01-5 mol% MgO, the cover portion contains 0.1-10 mol% MgO, and the margin portion contains 0.05-8 mol% MgO. This local differentiation allows the cover and margin portions to have enhanced moisture resistance through higher MgO content while the active portion maintains its capacitive function with lower MgO content, thus resolving the contradiction between capacity and moisture resistance reliability.
2Quantity of substance
If the dielectric layer is thinned to improve capacity, then the capacity is improved, but the thicknesses of the cover portion and the margin portion are reduced
Solution Approach 1:
The patent changes the chemical composition parameter by introducing magnesium oxide with specific content ranges in different portions. The cover portion has 0.1-10 mol% MgO and the margin portion has 0.05-8 mol% MgO, which are higher than the active portion's 0.01-5 mol%. This parameter change enhances the moisture resistance and effective thickness of protective portions without requiring increased physical thickness, thereby resolving the contradiction between capacity improvement through thinning and maintaining adequate cover/margin portion dimensions.
Data Source
AI summary
A capacitor component includes a body including a dielectric layer and first and second internal electrode layers, and external electrodes disposed on the body and connected to the first and second internal electrode layers, respectively. The body includes an active portion in which the first and second internal electrode layers are alternately disposed with the dielectric layer interposed therebetween, a cover portion disposed on an upper portion and a lower portion of the active portion, and a side margin portion disposed on both sides of the active portion opposing each other. When a content of magnesium (Mg) included in the active portion is A1, a content of magnesium (Mg) included in the cover portion is C1, and a content of magnesium (Mg) included in the margin portion is M1, 0<A1<M1≤C1 and A1/C1≤0.60 are satisfied.