Si-B Oxide Insulating Film for High-Frequency Dust Cores
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Solution Overview
Problem
Existing soft magnetic materials face challenges in maintaining high initial permeability at high frequencies while minimizing relative permittivity, which affects impedance frequency characteristics.
Innovation Solution
A soft magnetic metal particle with a core particle coated by an insulating film containing a complex oxide of Si and B, where B constitutes 1.0 mol % to 60.0 mol % of the total Si and B, reducing relative permittivity while maintaining initial permeability, thereby enhancing the μi/ε ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional soft magnetic materials are used, then initial permeability can be maintained, but relative permittivity remains high at high frequencies
Solution Approach 1:
The insulating film is formed as a composite material containing multiple oxide components (SiO2, B2O3, and at least one of GeO2, SnO2, or TiO2). This composite structure allows the film to simultaneously provide insulation while reducing relative permittivity through the specific combination of oxide components, thereby resolving the contradiction between maintaining initial permeability and reducing relative permittivity at high frequencies.
Solution Approach 2:
The invention changes the compositional parameters of the insulating film by controlling the ratios of different oxide components. Specifically, the film contains SiO2 at 5-50 mass%, B2O3 at 1-40 mass%, and GeO2/SnO2/TiO2 at 1-30 mass% each, with the remaining balance being SiO2. This parameter optimization enables the film to achieve both high insulation performance and reduced relative permittivity, thus resolving the technical contradiction.
2Reliability
If insulation performance is improved, then electrical properties are enhanced, but relative permittivity increases
Solution Approach 1:
The insulating film uses a composite oxide system where SiO2 provides the base insulation structure, B2O3 modifies the glass network to reduce permittivity, and GeO2/SnO2/TiO2 further optimize both insulation and permittivity characteristics. This multi-component composite approach allows simultaneous achievement of high insulation performance and low relative permittivity.
Solution Approach 2:
The insulating film is designed with specific local compositional characteristics where different oxide components are distributed to achieve optimal performance. The film contains SiO2 (5-50 mass%) for structural insulation, B2O3 (1-40 mass%) for permittivity reduction, and GeO2/SnO2/TiO2 (1-30 mass% each) for enhanced insulation and permittivity control, creating local quality variations that resolve the contradiction between insulation performance and relative permittivity.
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 solution effectively reduces relative permittivity while maintaining high initial permeability at high frequencies, improving the impedance frequency characteristics of the soft magnetic metal particles and dust cores.
Implementation Method 1
the insulating film includes a complex oxide containing Si and B
Implementation Method 2
A soft magnetic metal particle includes a core particle and an insulating film over a surface of the core particle
Data Source
AI summary
A soft magnetic metal particle may include a core particle and an insulating film over a surface of the core particle. The insulating film may include a complex oxide containing Si and B. B may constitute 1.0 mol % or more and 60.0 mol % or less of a total of Si and B in the insulating film.