Amorphous Soft Magnetic Powder Composition for Wide-Frequency Permeability
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Solution Overview
Problem
Amorphous alloy soft magnetic powders with high saturation magnetic flux density and low coercive force have limited frequency bands with high magnetic permeability, restricting their versatility and usability.
Innovation Solution
Development of amorphous alloy soft magnetic powder with a composition of (FexCo1-x)100−(a+b)(SiyB1-y)aMb, where M is selected from C, S, P, Sn, Mo, Cu, and Nb, with specific atomic ratios and impurities, achieving high circularity, aspect ratio, and particle size, and a minimal rate of decrease in magnetic permeability across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional amorphous alloy soft magnetic powder is used, then high saturation magnetic flux density and low coercive force are achieved, but magnetic permeability decreases significantly at high frequencies
Solution Approach 1:
The patent changes the chemical composition parameters by adding element M (Cu, Nb, Mo, P, C, S, or Sn) to the Fe-Co-Si-B amorphous alloy system. This compositional modification alters the magnetic properties, specifically reducing the rate of magnetic permeability decrease at high frequencies while maintaining high saturation magnetic flux density and low coercive force, thus expanding the usable frequency range.
Solution Approach 2:
The patent creates a composite amorphous alloy system by incorporating additional elements (M) into the base Fe-Co-Si-B amorphous alloy. This multi-element composite structure combines the beneficial properties of each element to achieve both high saturation magnetic flux density and improved high-frequency magnetic permeability characteristics, resolving the frequency band limitation.
2Adaptability or versatility
If particle size is reduced to improve magnetic permeability, then high frequency performance improves, but particle shape control becomes more difficult
Solution Approach 1:
The patent optimizes the particle size parameter within the range of 10-40 μm and controls the circularity (0.85-1.00) and aspect ratio (1.05-1.20) through compositional modification with element M. This parameter optimization achieves improved high-frequency magnetic permeability while maintaining manufacturable particle shape characteristics, resolving the contradiction between size reduction and shape control.
Data Source
AI summary
Amorphous alloy soft magnetic powder includes a composition expressed by a composition formula in atomic ratio (FexCo1-x)100−(a+b)(SiyB1-y)aMb, where M is at least one type selected from the group consisting of C, S, P, Sn, Mo, Cu, and Nb, 0.73≤x≤0.85, 0.02≤y≤0.10, 13.0≤a≤19.0, and 0≤b≤2.0; and impurities. The amorphous alloy soft magnetic powder has an average circularity of 0.85 or more, an average aspect ratio of 1.20 or less, and an average particle size of 10 μm or more and 40 μm or less. In the amorphous alloy soft magnetic powder, a rate of decrease D in magnetic permeability accompanying an increase in frequency is 15% or less.