Pressed Powder Magnetic Material for High Saturation and Low Loss
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Solution Overview
Problem
Current soft magnetic materials fail to simultaneously achieve high saturation magnetization, high magnetic permeability, low losses, high thermal stability, high strength, and high toughness, especially at high frequencies, which is crucial for efficient operation in rotating electric machines, power semiconductor devices, and high-frequency communication equipment.
Innovation Solution
A pressed powder material comprising first and second magnetic metal particles with specific Co content ratios and aspect ratios, where the second magnetic metal particles are present between the first, allowing for controlled sintering and suppression of coarsening, thereby achieving high saturation magnetization and low losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional soft magnetic materials are used, then high saturation magnetization can be achieved, but magnetic losses increase at high frequencies
Solution Approach 1:
The patent uses a composite pressed powder material consisting of Fe-Co alloy particles (providing high saturation magnetization) combined with insulating materials and binders. This composite structure allows the magnetic particles to be finely divided and insulated from each other, reducing eddy current losses while maintaining high saturation magnetization through the Fe-Co composition.
Solution Approach 2:
The patent optimizes multiple parameters including the Fe-Co alloy composition (specific Co content), particle size distribution, pressing density, and sintering conditions. By carefully controlling these parameters, the material achieves high saturation magnetization while minimizing magnetic losses through reduced eddy currents and optimized magnetic domain structure.
2Volume of moving object
If magnetic permeability is increased to reduce equipment size, then device compactness improves, but losses increase
Solution Approach 1:
The patent optimizes the Fe-Co alloy composition and particle characteristics to achieve high magnetic permeability at reduced frequencies. The specific composition and fine particle division allow high permeability with lower losses, enabling compact equipment design without the penalty of excessive magnetic losses.
3Loss of energy
If particle size is decreased to reduce eddy current loss, then eddy current loss decreases, but saturation magnetization decreases
Solution Approach 1:
The patent uses Fe-Co alloy particles with optimized composition that maintain high saturation magnetization even at fine particle sizes. The composite structure with insulating materials prevents eddy current formation between particles, allowing fine division for loss reduction while the Fe-Co composition ensures high saturation magnetization is maintained.
Solution Approach 2:
The patent changes the material composition from pure Fe to Fe-Co alloy, which maintains high saturation magnetization at smaller particle sizes. The Co addition modifies the magnetic properties to sustain high saturation magnetization even when particles are finely divided for eddy current loss reduction.
4Strength
If pressing density is increased to improve mechanical strength, then strength increases, but magnetic losses increase
Solution Approach 1:
The patent uses a composite structure where magnetic particles are embedded in an insulating binder matrix. This allows adequate pressing density for mechanical strength while the insulating binder prevents direct particle-to-particle contact, reducing eddy current losses even at higher densities.
Solution Approach 2:
The patent introduces insulating materials and binders as intermediary substances between magnetic particles. These intermediaries maintain mechanical strength through proper bonding while electrically isolating the particles, preventing eddy current formation and reducing magnetic losses.
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 material exhibits high saturation magnetization, low magnetic losses, and enhanced mechanical characteristics, effectively addressing the limitations of existing soft magnetic materials in high-frequency applications.
Implementation Method 1
first magnetic metal particles having a first magnetic metal phase containing Fe and Co; and second magnetic metal particles having a second magnetic metal phase containing Fe
Data Source
AI summary
A pressed powder material according to embodiments is a pressed powder material including first magnetic metal particles having a first magnetic metal phase containing Fe and Co; and second magnetic metal particles having a second magnetic metal phase containing Fe, in which when the amounts of Co with respect to the total amounts of Fe and Co of the first and second magnetic metal particles are designated as Co1 and Co2, respectively, the ratio of Co2 to Co1 (Co2/Co1) is from 0 to 0.5, the average value of the ratio of the major axis to the minor axis is 2 or greater for the first magnetic metal particles and 1 or greater for the second magnetic metal particles, the second magnetic metal particles are present between the particles of the first magnetic metal particles, and the average value of the major axis of the second magnetic metal particles is equal to or longer than the average value of the major axis of the first magnetic metal particles.