Soft Magnetic Alloy Microstructure for Temperature-Stable Core Loss
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Solution Overview
Problem
Existing soft magnetic alloys face challenges in achieving good temperature properties for core loss, particularly in high-frequency ranges, due to variations in crystallite area ratios, amorphous phase thickness, and standard deviation, which affect magnetic anisotropy and core loss efficiency.
Innovation Solution
A soft magnetic alloy with a crystallite area ratio of 40% to 60% and an average amorphous phase thickness of 3.0 nm to 10.0 nm, along with a standard deviation of 10.0 nm or less, is developed, incorporating elements like Fe, Nb, Hf, Zr, Ta, Mo, V, Ti, W, P, Cu, and Co, to control effective magnetic anisotropy and improve temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crystallite area ratio is increased to improve magnetic anisotropy, then magnetic performance is enhanced, but core loss increases at high frequencies
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystallite area ratio within 40-60% and the amorphous phase thickness within 3.0-10.0 nm with standard deviation ≤10.0 nm. This optimization balances magnetic anisotropy enhancement with core loss reduction at high frequencies, resolving the contradiction between magnetic performance and energy loss.
Solution Approach 2:
The patent utilizes a composite structure combining crystalline phases (for magnetic anisotropy) and amorphous phases (for low core loss). The specific composition ratio and phase distribution create a synergistic effect that simultaneously achieves high magnetic performance and low core loss, addressing the technical contradiction.
2Reliability
If the amorphous phase thickness is decreased to improve magnetic properties, then magnetic anisotropy is enhanced, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent specifies the amorphous phase thickness parameter within 3.0-10.0 nm with a standard deviation of ≤10.0 nm, providing a controlled range that balances magnetic anisotropy enhancement with manufacturability. This parameter optimization resolves the contradiction between performance improvement and manufacturing precision.
3Loss of energy
If the crystallite area ratio is optimized for high-frequency performance, then core loss is reduced, but temperature stability becomes more challenging to achieve
Solution Approach 1:
The patent employs a composite microstructure with crystalline and amorphous phases in specific proportions. The crystalline phase provides low core loss at high frequencies, while the amorphous phase contributes to temperature stability. This composite structure simultaneously addresses both requirements.
Solution Approach 2:
The patent creates different phases with distinct local properties: crystalline regions optimized for magnetic performance and amorphous regions providing thermal stability. This local differentiation allows the material to achieve both low core loss and temperature stability simultaneously.
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 alloy achieves improved temperature stability and reduced core loss in high-frequency ranges by controlling the crystallite and amorphous phase parameters, resulting in enhanced magnetic performance.
Implementation Method 1
both a crystal grain size of nanocrystals and an average thickness of amorphous phases are within specific ranges, an average Fe concentration in the amorphous phases near a surface of the nanocrystals is lower than an average Fe concentration in the nanocrystals, and a crystallinity is high
Data Source
AI summary
To provide a soft magnetic alloy or the like, from which a magnetic component having a good temperature property of core loss can be obtained. The soft magnetic alloy includes Fe. The soft magnetic alloy includes a crystallite, and an amorphous phase existing around the crystallite. A total area ratio of the crystallite in a cross section of the soft magnetic alloy is 40% or more and less than 60%. An average thickness of the amorphous phase is 3.0 nm or more and 10.0 nm or less. A standard deviation of a thickness of the amorphous phase is 10.0 nm or less.