Laminated Ceramic Capacitor Moisture Resistance
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Solution Overview
Problem
Laminated ceramic capacitors with calcium zirconate-based dielectric ceramics suffer from degraded moisture resistance when the layer thickness is reduced, particularly in high temperature and high humidity conditions.
Innovation Solution
A laminated ceramic capacitor composition including a calcium zirconate-based perovskite-type compound with specific molar ratios of Mn, Sr, and Si, along with internal Cu electrodes, which improves moisture resistance by promoting stable sintering and crystallization, thereby enhancing durability under high temperature and humidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric ceramic layer thickness is reduced to achieve miniaturization, then the size of the laminated ceramic capacitor is reduced, but the moisture resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric ceramic by specifying precise molar ratios of Mn (0.01-0.10), Sr (0.10-5.00), and Si (0.10-10.00) relative to Zr, along with maintaining Ca/Zr molar ratio between 0.95-1.05. These parameter changes optimize the ceramic's moisture resistance while allowing reduced layer thickness
Solution Approach 2:
The patent creates a composite dielectric ceramic material combining calcium zirconate base with multiple dopants (Mn, Sr, Si) that work synergistically. This composite structure provides both the electrical performance needed for thin layers and enhanced moisture resistance through the combined effects of the dopants on grain boundary properties
2Volume of moving object
If the dielectric ceramic layer thickness is reduced to achieve miniaturization, then the size of the laminated ceramic capacitor is reduced, but the production quality deteriorates
Solution Approach 1:
The patent optimizes composition parameters including Ca/Zr molar ratio (0.95-1.05), Mn content (0.01-0.10), Sr content (0.10-5.00), and Si content (0.10-10.00) to ensure stable sintering behavior in thin layers, enabling precise manufacturing despite reduced thickness
Solution Approach 2:
The patent introduces Si as an intermediary element that mediates between the dopants (Mn, Sr) and the calcium zirconate matrix. Si forms a network structure that stabilizes the ceramic during sintering and controls grain growth, ensuring manufacturing precision in thin layers
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 capacitor exhibits improved moisture resistance and lifetime characteristics in load tests under high temperature and high humidity conditions, with favorable performance in terms of porosity and insulation resistance.
Implementation Method 1
The laminated body has a composition including a calcium zirconate based perovskite-type compound as a main constituent, and further including Mn, Sr, and Si... promotes stable sintering and crystallization
Implementation Method 2
The laminated body has a composition including a calcium zirconate based perovskite-type compound as a main constituent, and further including Mn, Sr, and Si... promotes stable sintering and crystallization
Implementation Method 3
a laminated body which includes dielectric ceramic layers including crystal grains and crystal grain boundaries, and includes internal electrode layers
Data Source
AI summary
A laminated ceramic capacitor that includes a laminated body including dielectric ceramic layers having crystal grains and crystal grain boundaries, and including internal electrode layers. An external electrode is formed on a surface of the laminated body, and is electrically connected to the internal electrode layers exposed at the surface of the laminated body. The laminated body has a composition including a calcium zirconate based perovskite-type compound as a main constituent, and further including Mn, Sr, and Si. When the laminated body is dissolved, the Si contained therein is 0.1 parts by mol or more and 10 parts by mol or less with respect to 100 parts by mol of Zr, and the molar ratio of Mn to Sr is 0.3 or more and 3.2 or less.