Dielectric Ceramic Composition for Moisture-Resistant Laminated Capacitors
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Solution Overview
Problem
Dielectric ceramic laminated capacitors using nonreducible materials experience reduced insulation resistance over time, especially under high-humidity conditions, leading to reliability issues.
Innovation Solution
A dielectric ceramic composition comprising (CaSr)(TiZr)O3 with specific amounts of SiO2, MnO, and Al2O3 is used, where Al2O3 is present in amounts between 0.01 and 0.079 parts by mol, to enhance moisture resistance and reduce degradation of insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If dielectric layer thickness is decreased to improve capacitor miniaturization, then device size is reduced, but insulation resistance decreases and reliability deteriorates
Solution Approach 1:
The patent changes the compositional parameters of the dielectric ceramic to achieve superior electrical properties. By optimizing the Al2O3 content (0.003-0.03 mass%) and adding SiO2 (0.1-5 mass%) and MnO (0.1-5 mass%), the ceramic achieves higher insulation resistance per unit thickness, allowing thinner dielectric layers to maintain adequate insulation performance for miniaturized capacitors.
Data Source
AI summary
A dielectric ceramic composition enabling one to obtain a laminated capacitor which hardly causes degradation of insulation resistance with time under high-humidity even in using a base metal such as Ni as an internal electrode, contains as a main constituent, a constituent represented by (CaxSr1-x)(TiyZr1-y)O3 in which x and y are 0≦x≦1 and 0≦y≦0.50, and, as accessory constituents, at least 0.5 parts by mol and at most 15 parts by mol of SiO2, at least 0.1 parts by mol and at most 10 parts by mol of MnO, and at least 0.01 parts by mol and at most 0.079 parts by mol of Al2O3, with respect to 100 parts by mol of the main constituent.