Dielectric Ceramic Composition for Wide Temperature Capacitors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multilayer ceramic capacitors exhibit insufficient temperature characteristics within the range of 25° C. to 85° C., which is not adequate for broader temperature applications.
Innovation Solution
A ceramic electronic component comprising a laminate with dielectric layers and internal electrodes, where the dielectric layers contain a specific composition of Ba, Si, Al, Ti, Fe, Mn, Sr, and Mg, providing excellent temperature characteristics over a wide temperature range of −55° C. to 125° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional dielectric ceramic composition is used, then manufacturing is simple, but temperature characteristics are insufficient outside 25°C to 85°C range
Solution Approach 1:
The patent modifies the chemical composition parameters of the dielectric ceramic by specifying precise weight ratios of Ba (20-40 parts), Si (48-75 parts), Al (5-20 parts), and secondary elements (Mn: 1-10 parts, Sr: 1-35 parts, Mg: 0.1-6 parts, Ti/Fe: 1-35 parts). This parameter optimization enables the capacitor to maintain stable capacitance across an expanded temperature range of -55°C to 125°C while preserving manufacturing feasibility through conventional sintering processes.
Solution Approach 2:
The invention employs a composite dielectric ceramic system combining multiple oxides (BaO, SiO2, Al2O3, MnO, SrO, MgO, TiO2/Fe2O3) in specific proportions. This composite material approach creates synergistic effects where the primary Ba-Si-Al system provides base dielectric properties while secondary elements adjust temperature coefficients and stabilize the crystal structure across wide temperature variations, achieving both improved temperature characteristics and broad applicability.
2Stability of the object's composition
If dielectric layer composition is optimized for wide temperature range, then temperature stability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes optimized composition ranges with Ba at 20-40 parts, Si at 48-75 parts, and Al at 5-20 parts, where Si serves as the dominant component (48-75 parts) providing structural stability. This parameter configuration achieves temperature stability across -55°C to 125°C while maintaining reasonable manufacturing precision, as the broad Si range accommodates normal compositional variations without compromising performance.
Solution Approach 2:
The invention differentiates the functional roles of various elements within the composition: Ba, Si, and Al form the primary dielectric matrix providing base stability, while Mn, Sr, Mg, and Ti/Fe serve as secondary modifiers in smaller amounts (1-35 parts each) that fine-tune temperature coefficients and stabilize specific crystal phases. This local quality differentiation allows each component to contribute optimally to temperature stability without requiring ultra-precise control of all elements simultaneously.
Data Source
AI summary
A ceramic electronic component or a dielectric ceramic composition having a first element group and a second element group. The first element group consists of Ba, Si, and Al, and contains in 100 parts by weight of the first element group, 20 to 40 parts by weight of BaO, 48 to 75 parts by weight of SiO2, and 5 to 20 parts by weight of Al2O3. The second element group consists of at least one of Ti and Fe, Mn, Sr, and Mg, and contains, with respect to 100 parts by weight of the first element group, 1 to 10 parts by weight of MnO, 1 to 35 parts by weight of SrO, 0.1 to 6 parts by weight of MgO, and 1 to 35 parts by weight of TiO2 and/or Fe2O3.