Soft Magnetic Powder Coating for High-Frequency Core Loss Reduction
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Solution Overview
Problem
Existing magnetic materials used in coil components face challenges in achieving high magnetic permeability and electrical resistance, particularly when high-frequency magnetic characteristics are required, as insulation treatments often compromise magnetic permeability.
Innovation Solution
A soft magnetic powder is developed with a core covered by an insulating film containing an insulating metal oxide and an iron component embedded within, which is formed by mixing a core, an iron salt, a metal alkoxide, and optional water-soluble polymers and surfactants, followed by drying to create a slurry and forming the insulating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface of the metal magnetic substance is subjected to insulation treatment, then the insulation performance is improved, but the magnetic permeability decreases
Solution Approach 1:
The patent applies local quality by creating a non-uniform insulating film with an iron component concentration gradient. The insulating film has higher iron component concentration near the core surface and lower concentration toward the outer surface, allowing the region adjacent to the core to maintain magnetic properties while the outer region provides insulation. This resolves the contradiction by making different parts of the insulating film serve different functions: magnetic coupling near the core and electrical insulation at the outer surface.
Solution Approach 2:
The patent uses composite materials by combining the metal magnetic substance core with an insulating film containing iron component. This creates a composite structure where the core provides magnetic properties and the insulating film with embedded iron component provides both insulation and magnetic coupling. The composite material approach allows simultaneous achievement of insulation performance and magnetic permeability that cannot be obtained with单一 materials.
2Loss of energy
If the surface of the metal magnetic substance is subjected to insulation treatment, then the core loss at high frequencies is reduced, but the magnetic permeability decreases
Solution Approach 1:
The patent applies local quality by creating a non-uniform insulating film with an iron component concentration gradient. The insulating film has higher iron component concentration near the core surface and lower concentration toward the outer surface, allowing the region adjacent to the core to maintain magnetic properties while the outer region provides insulation. This resolves the contradiction by making different parts of the insulating film serve different functions: magnetic coupling near the core and electrical insulation at the outer surface.
Solution Approach 2:
The patent uses composite materials by combining the metal magnetic substance core with an insulating film containing iron component. This creates a composite structure where the core provides magnetic properties and the insulating film with embedded iron component provides both insulation and magnetic coupling. The composite material approach allows simultaneous achievement of insulation performance and magnetic permeability that cannot be obtained with单一 materials.
3Reliability
If an insulating film is formed on the core surface, then the electrical resistance is improved, but the magnetic permeability decreases
Solution Approach 1:
The patent applies local quality by creating a non-uniform insulating film with an iron component concentration gradient. The insulating film has higher iron component concentration near the core surface and lower concentration toward the outer surface, allowing the region adjacent to the core to maintain magnetic properties while the outer region provides insulation. This resolves the contradiction by making different parts of the insulating film serve different functions: magnetic coupling near the core and electrical insulation at the outer surface.
Solution Approach 2:
The patent uses composite materials by combining the metal magnetic substance core with an insulating film containing iron component. This creates a composite structure where the core provides magnetic properties and the insulating film with embedded iron component provides both insulation and magnetic coupling. The composite material approach allows simultaneous achievement of insulation performance and magnetic permeability that cannot be obtained with单一 materials.
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 resulting soft magnetic powder achieves high magnetic permeability and electrical resistance, reducing core loss at high frequencies while maintaining insulation performance, suitable for applications in inductors and coil components.
Implementation Method 1
adding distilled water to the solution, hydrolyzing the metal alkoxide
Implementation Method 2
causing adsorption of hydroxides to the metal powder surface
Data Source
AI summary
A soft magnetic powder including a core containing a soft magnetic metal material and an insulating film covering the surface of the core. The insulating film contains an insulating metal oxide and an iron component, and the iron component is embedded in the insulating film.