Multi-Layer Ceramic Capacitor Grain Boundary Control
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Solution Overview
Problem
The miniaturization of multilayer ceramic capacitors leads to accelerated dielectric breakdown and reliability issues due to insufficient research on dielectric composition and microstructure control, particularly at the grain boundary, which affects insulation resistance and capacitance.
Innovation Solution
A multilayer ceramic capacitor design with a dielectric layer comprising dielectric grains and a grain boundary with a controlled Si/Ni ratio of 1 to 6 and a thickness of 0.7 to 1.5 nm, and a Ni/Ti ratio of 0.1 or less, to enhance insulation resistance and prevent dielectric grain deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric layer thickness is reduced to achieve miniaturization and high capacitance, then the capacitor size is reduced and capacitance increases, but dielectric breakdown is accelerated and reliability deteriorates
Solution Approach 1:
The patent applies local quality by creating a dual-structure dielectric layer with different regions having distinct functions: a first dielectric layer region with higher breakdown voltage for reliability, and a second dielectric layer region for high capacitance. This local differentiation allows the thin overall structure to maintain high reliability in critical areas while achieving miniaturization and high capacitance overall.
Solution Approach 2:
The patent uses composite materials by combining different dielectric materials or compositions in the first and second dielectric layer regions. The first region uses materials optimized for breakdown voltage resistance, while the second region uses materials optimized for capacitance, creating a composite structure that simultaneously achieves miniaturization, high capacitance, and high reliability.
2Volume of moving object
If the dielectric layer thickness is reduced to achieve miniaturization, then the capacitor size is reduced, but insulation resistance of the grain boundary decreases and reliability deteriorates
Solution Approach 1:
The patent applies local quality by specifically optimizing the grain boundary regions within the dielectric layer. By controlling the composition and structure of the dielectric materials in the first and second layer regions, the patent enhances grain boundary insulation resistance locally, preventing deterioration even when the overall dielectric layer thickness is reduced for miniaturization.
Data Source
AI summary
A multilayer ceramic capacitor includes a ceramic body having a dielectric layer disposed between two internal electrodes. The dielectric layer includes a plurality of dielectric grains. A grain boundary between at least two dielectric grains of the plurality of dielectric grains has a ratio Si/Ni of a weight of Si to a weight of Ni in the grain boundary that is at least 1 and 6 or less.