Amorphous Fe-Si-B-C Soft Magnetic Powder for Low Coercive Force
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Solution Overview
Problem
Existing soft magnetic alloy powders face challenges in achieving both high magnetic permeability and low coercive force, making it difficult to optimize magnetic properties and reduce the size of magnetic elements while maintaining performance.
Innovation Solution
An amorphous alloy soft magnetic powder with a composition of Fea(Si1-xBx)bCc, where 76.0≤a≤81.0, 16.0≤b≤22.0, and 0.5≤x≤0.9, is developed, with specific XAFS measurement criteria to ensure high amorphization and optimal magnetic properties, including a Si—K absorption edge XANES spectrum intensity ratio of 0.25 or less and radial distribution function features that support high magnetic permeability and low coercive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic permeability is increased in soft magnetic powder, then magnetic performance is improved, but coercive force cannot be sufficiently decreased
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of Fe, Si, B, and C elements in the amorphous alloy, along with controlling the XANES spectrum intensity ratio A/B to be 0.25 or less. This compositional and structural parameter optimization enables the material to achieve both high magnetic permeability and low coercive force simultaneously, resolving the technical contradiction between these two magnetic properties.
Solution Approach 2:
The patent uses a composite amorphous alloy system combining Fe, Si, B, and C elements with specific compositional ranges. This multi-element composite structure creates synergistic effects that improve magnetic permeability while reducing coercive force, overcoming the limitations of single-element or simpler alloy systems.
2Reliability
If amorphous alloy composition is optimized for high magnetic permeability, then magnetic performance improves, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent defines specific parameter ranges for each element (Fe: 76.0-81.0 atomic %, Si: 3.0-8.0 atomic %, B: 10.0-15.5 atomic %, C: 0.01-1.0 atomic %) and the XANES intensity ratio (A/B ≤ 0.25). These quantified parameters provide clear manufacturing targets and control criteria, making it easier to achieve consistent high magnetic permeability while maintaining compositional precision.
3Volume of moving object
If magnetic element size is reduced, then device integration is improved, but maintaining performance becomes more difficult
Solution Approach 1:
The patent optimizes the magnetic properties of the amorphous alloy powder through controlled composition and structure, achieving high magnetic permeability and low coercive force. These enhanced material properties allow magnetic elements to be miniaturized while maintaining or improving performance, as the superior magnetic characteristics compensate for the reduced size.
Solution Approach 2:
The use of composite amorphous alloy materials with optimized multi-element composition enables higher performance density, allowing smaller magnetic element volumes to achieve the same magnetic performance that would require larger volumes of conventional materials.
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 amorphous alloy soft magnetic powder achieves a high degree of amorphization, resulting in both high magnetic permeability and low coercive force, enabling the reduction of magnetic element size and increasing output while maintaining stability and performance.
Implementation Method 1
when XAFS measurement is performed on the particle with an analysis depth set to a surface, an obtained Si—K absorption edge XANES spectrum has a peak A having an energy in a range of 1845±1 eV and a peak B having an energy in a range of 1848±1 eV
Implementation Method 2
the soft magnetic alloy powder formed of an amorphous phase can be obtained when a powder body is prepared by an atomization method and then a heat treatment is not performed
Implementation Method 3
an amorphous alloy soft magnetic powder which has a high degree of amorphization and in which both a magnetic permeability and a coercive force are high and low, respectively
Data Source
AI summary
An amorphous alloy soft magnetic powder contains a particle having a composition with a compositional formula Fea(Si1-xBx)bCc expressed by an atomic ratio, in which 76.0≤a≤81.0, 16.0≤b≤22.0, 0<c≤3.0, and 0.5≤x≤0.9. When XAFS measurement is performed with an analysis depth set to a surface, an obtained Si—K absorption edge XANES spectrum has a peak A having an energy in a range of 1845±1 eV and a peak B having an energy in a range of 1848±1 eV, and an intensity ratio A/B is 0.25 or less where A is an intensity of the peak A and B is an intensity of the peak B.