Ferrite Ceramic Composition for Stronger High-Permeability Coil Components
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Solution Overview
Problem
Existing composite magnetic materials used in coil components, such as those containing ferrite compositions and zinc silicate, suffer from insufficient flexural strength and magnetic permeability.
Innovation Solution
A ferrite ceramic composition is formulated with specific ranges of Fe, Ni, Zn, Cu, and Si as main components, and Bi, Co, Mn, and Cr as sub-components, along with controlled crystal grain sizes and phase compositions to enhance flexural strength and magnetic permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composite magnetic material containing ferrite composition and zinc silicate is used, then specific resistance is improved, but flexural strength deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of ferrite composition (containing Fe, Ni, Zn, Cu) and zinc silicate glass phase. This composite structure allows the zinc silicate to provide high specific resistance while the ferrite phase maintains magnetic properties and structural integrity for flexural strength
Solution Approach 2:
The patent optimizes the composition parameters by controlling the molar ratios of Fe2O3 (27-41%), NiO (16-24%), ZnO (23-37%), CuO (5-9%), and SiO2 (4-14%), along with specific additions of Bi2O3, Co3O4, Mn2O3, and Cr2O3. These parameter changes balance the competing requirements of electrical resistance and mechanical strength
2Reliability
If crystal grain size is reduced to enhance magnetic permeability, then magnetic permeability is improved, but flexural strength deteriorates
Solution Approach 1:
The patent optimizes the crystal grain size parameter to a specific range (0.2-0.8 μm, preferably 0.2-0.5 μm) that balances magnetic permeability and flexural strength. This parameter optimization prevents excessive grain growth that would reduce permeability while avoiding overly fine grains that would weaken the material
Data Source
AI summary
A ferrite ceramic composition includes, as main components, from 27.0 mol % to 41.0 mol % of Fe in terms of Fe2O3, from 16.0 mol % to 24.0 mol % of Ni in terms of NiO, from 23.0 mol % to 37.0 mol % of Zn in terms of ZnO, from 5.0 mol % to 9.0 mol % of Cu in terms of CuO, and from 4.0 mol % to 14.0 mol % of Si in terms of SiO2, and as sub-components, relative to 100 parts by mass of the main components, from 0.3 parts by mass to 1.2 parts by mass of Bi in terms of Bi2O3, from 0.3 parts by mass to 1.2 parts by mass of Co in terms of Co3O4, from 0.01 parts by mass to 0.25 parts by mass of Mn in terms of Mn2O3, and from 0.003 parts by mass to 0.030 parts by mass of Cr in terms of Cr2O3.