Flaky Magnetic Metal Particles for High-Frequency Loss Reduction
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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, and excellent mechanical characteristics, especially at high frequencies, which are essential for advanced rotating electric machines, power semiconductor devices, and high-frequency communication equipment.
Innovation Solution
The development of flaky magnetic metal particles with specific dimensions and orientations, including a flat surface structure and a magnetic metal phase containing iron, cobalt, or nickel, with a controlled thickness and aspect ratio, and the use of a coating layer or intercalated phase to enhance magnetic anisotropy and thermal stability, resulting in a pressed powder material with direction-induced coercivity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of magnetic metal particles is decreased to reduce eddy current loss, then electrical resistance increases and eddy current loss decreases, but saturation magnetization decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of flaky magnetic metal particles within the range of 10 nm to 100 μm and the aspect ratio (average length/thickness) between 5 and 10,000. This optimization allows the material to achieve low eddy current loss through reduced thickness while maintaining adequate saturation magnetization through controlled aspect ratio and composition, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent uses composite materials by combining flaky magnetic metal particles with specific compositions (containing Fe, Co, or Ni as primary elements) with coating layers or intercalated phases. This composite structure enables the magnetic particles to maintain high saturation magnetization while the flaky geometry with controlled thickness reduces eddy current loss, simultaneously achieving both objectives.
2Volume of moving object
If the working frequency is increased to enable size reduction of equipment, then equipment size decreases, but losses increase due to ferromagnetic resonance and eddy current effects
Solution Approach 1:
The patent applies parameter changes by controlling the thickness and aspect ratio of flaky magnetic metal particles, which shifts the ferromagnetic resonance frequency to higher values. This allows the material to operate efficiently at high frequencies with reduced losses. Simultaneously, the reduced size of particles enables compact equipment design, achieving both size reduction and low loss performance at high frequencies.
Solution Approach 2:
The patent applies segmentation by dividing the magnetic material into fine flaky particles with controlled dimensions. This segmentation reduces eddy current paths and allows high-frequency operation with reduced losses while maintaining compact equipment size. The flaky structure with specific thickness and aspect ratio enables efficient high-frequency magnetic performance.
3Quantity of substance
If the magnetic permeability is increased to maximize magnetic flux density, then saturation magnetization increases, but losses increase due to hysteresis and eddy current effects
Solution Approach 1:
The patent applies parameter changes by optimizing the composition (Fe, Co, Ni with specific additives), thickness (10 nm to 100 μm), and aspect ratio (5 to 10,000) of flaky magnetic metal particles. This multi-parameter optimization achieves high magnetic permeability while maintaining low losses through controlled coercivity and reduced eddy current effects, resolving the contradiction between magnetic permeability and loss.
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
This approach leads to materials with reduced eddy current and hysteresis losses, increased magnetic permeability, and improved mechanical characteristics, suitable for high-frequency applications and complex shapes, enhancing the efficiency and performance of devices like motors, transformers, and antennas.
Implementation Method 1
In order to make the eddy current loss small, it is effective to increase the electrical resistance, or decrease the sizes of metal parts, or finely divide the magnetic domain structure
Implementation Method 2
In order to make the hysteresis loss small, it is effective to reduce coercivity or increase the saturation magnetization
Implementation Method 3
the use of a coating layer or intercalated phase to enhance magnetic anisotropy and thermal stability, resulting in a pressed powder material with direction-induced coercivity differences
Implementation Method 4
it is preferable that the saturation magnetization of a soft magnetic material is as large as possible so as not to bring about magnetic saturation
Data Source
AI summary
Provided is a plurality of flaky magnetic metal particles of embodiments, each flaky magnetic metal particle having a flat surface having either or both of a plurality of concavities and a plurality of convexities, the concavities or convexities being arranged in a first direction and each having a width of 0.1 μm or more, a length of 1 μm or more, and an aspect ratio of 2 or higher; and a magnetic metal phase containing at least one primary element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni). The flaky magnetic metal particles have an average thickness of between 10 nm and 100 μm inclusive, and the average value of the ratio of the average length within the flat surface with respect to the thickness is between 5 and 10,000 inclusive.