Fe-Co-Ni Magnetic Material with Eutectic Oxide Coating for High-Frequency Inductors
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Solution Overview
Problem
Current magnetic materials fail to meet the requirements of high magnetic permeability, low loss, high saturation magnetization, high thermal stability, and high oxidation resistance, especially at high frequencies, making them unsuitable for advanced power semiconductors and high-frequency communication equipment.
Innovation Solution
A magnetic material composed of magnetic particles with a specific alloy structure, including Fe, Co, and Ni, coated with oxides, and having an eutectic structure between these particles, which enhances thermal stability and oxidation resistance while maintaining high magnetic permeability and low loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic materials are used, then they can provide basic magnetic properties, but they fail to achieve high magnetic permeability and low loss at high frequencies
Solution Approach 1:
The patent employs a composite material structure consisting of magnetic particles (Fe, Co, Ni-based alloys) combined with oxide coatings and eutectic phases. This composite approach enables simultaneous achievement of high magnetic permeability through the magnetic particles and low loss through the oxide layers that reduce eddy current effects, specifically optimizing performance in the MHz frequency range
Solution Approach 2:
The patent optimizes specific material parameters including the composition ratios of Fe-Co-Ni alloys, the thickness and type of oxide coatings, and the eutectic phase composition. These parameter adjustments are specifically tailored to enhance magnetic permeability while minimizing energy loss at high frequencies, addressing the frequency-dependent performance requirements
2Reliability
If magnetic materials are designed for high magnetic permeability, then they can improve inductance performance, but they suffer from poor thermal stability and oxidation resistance
Solution Approach 1:
The patent creates a composite structure where magnetic particles are coated with oxide layers and embedded in a eutectic phase matrix. The oxide coatings (such as Fe oxide, Co oxide, Ni oxide) provide oxidation resistance and thermal stability, while the magnetic particles maintain high permeability. The eutectic phase binds these components together with enhanced thermal stability
Solution Approach 2:
The patent applies different materials with specific properties to different locations: magnetic particles with high permeability are placed in the core region, while oxide coatings with high oxidation resistance are applied to the surfaces. This local differentiation allows each component to perform its specialized function optimally
3Force
If magnetic materials are optimized for saturation magnetization, then they can improve magnetic strength, but they increase energy loss at high frequencies
Solution Approach 1:
The patent uses a composite system where Fe-Co-Ni magnetic particles provide high saturation magnetization, while the surrounding oxide coatings and eutectic phase structure reduce eddy current losses. The oxide layers act as electrical insulators that break eddy current paths, allowing the magnetic particles to maintain high magnetization without proportionally increasing energy loss at MHz frequencies
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 magnetic material achieves high magnetic permeability and low loss in the MHz range, supporting high-frequency applications with improved thermal stability and oxidation resistance, suitable for power semiconductors and communication equipment.
Implementation Method 1
oxide particles of a second oxide that are present between the magnetic particles and constitute an eutectic reaction system with the first oxide; and an oxide phase that is present between the magnetic particles and has an eutectic structure of the first oxide and the second oxide
Data Source
AI summary
A magnetic material is disclosed, which includes magnetic particles containing at least one magnetic metal selected from the group including Fe, Co and Ni, and at least one non-magnetic metal selected from Mg, Al, Si, Ca, Zr, Ti, Hf, Zn, Mn, rare earth elements, Ba and Sr; a first coating layer of a first oxide that covers at least a portion of the magnetic particles; oxide particles of a second oxide that is present between the magnetic particles and constitutes an eutectic reaction system with the first oxide; and an oxide phase that is present between the magnetic particles and has an eutectic structure of the first oxide and the second oxide.