Dielectric Ceramic Composition for Base Metal MLCCs
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Solution Overview
Problem
Existing dielectric ceramic compositions for multi-layer ceramic capacitors face challenges with low dielectric constant, dielectric characteristics, and insulation resistance life, particularly when fired in reducing atmospheres, which limits their temperature stability and reliability.
Innovation Solution
A dielectric ceramic composition comprising specific weight percentages of Yb2O3, MgO, CaSiO3, WO3, and MnCO3 based on (BaO)m.TiO2, allowing for superior reduction resistance, capacitance temperature characteristics, and enhanced insulation resistance, enabling the use of base metals instead of precious metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dielectric ceramic compositions are fired in reducing atmospheres to use base metals, then manufacturing cost is reduced and adaptability is improved, but dielectric characteristics and insulation resistance life deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric ceramic by incorporating specific amounts of MgO (0.1-0.5 wt%), CaO (0.1-0.5 wt%), SiO2 (1-5 wt%), and rare earth oxides (0.01-0.1 wt%). These parameter adjustments enable the ceramic to maintain stable dielectric characteristics when fired in reducing atmospheres, resolving the contradiction between metal selection flexibility and dielectric reliability
Solution Approach 2:
The patent creates a composite dielectric ceramic system combining BaTiO3 main component with multiple sub-components including MgO, CaO, SiO2, and rare earth oxides. This composite structure provides both the reduction resistance needed for base metal compatibility and the stable dielectric characteristics required for reliable capacitor operation
2Ease of manufacture
If dielectric ceramic compositions are fired in reducing atmospheres, then manufacturing cost is reduced by using base metals, but insulation resistance life deteriorates
Solution Approach 1:
The patent adjusts compositional parameters by adding specific amounts of SiO2 (1-5 wt%) and rare earth oxides (0.01-0.1 wt%) to the dielectric ceramic formula. These parameter changes enhance the formation of stable grain boundary phases that maintain insulation resistance over time, even when fired in reducing atmospheres with base metals, thus resolving the contradiction between manufacturing cost and insulation resistance life
3Device complexity
If conventional dielectric ceramic compositions are used, then manufacturing process is simple, but dielectric constant is low and dielectric characteristics are poor
Solution Approach 1:
The patent develops a composite dielectric ceramic composition with BaTiO3 as the main component and multiple sub-components including MgO, CaO, SiO2, and rare earth oxides in specific proportions. This composite material approach achieves high dielectric constant (≥3500) and excellent dielectric characteristics while maintaining a relatively simple manufacturing process, resolving the contradiction between composition complexity and dielectric reliability
Data Source
AI summary
The present invention provides a dielectric ceramic composition, which is, in addition to having superior resistance to reduction during firing, superior capacitance temperature characteristics after firing and superior dielectric characteristics, also demonstrates an enhanced lifetime for insulation resistance.The present invention is a dielectric ceramic composition comprising 0.18 to 0.5 part by weight of Yb2O3, 0.6 to 1.5 parts by weight of MgO, 0.4 to 1.5 parts by weight of CaSiO3, 0.02 to 0.2 part by weight of WO3, 0.1 to 0.4 part by weight of MnCO3 and 0.02 to 0.2 part by weight of MoO3 based on 100 parts by weight of (BaO)m.TiO2 (wherein, m is from 0.990 to 0.995).