Amorphous Soft Magnetic Powder Composition for Low Coercivity
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Solution Overview
Problem
Existing soft magnetic alloy powders face challenges in achieving both low coercive force and high saturation magnetic flux density, which are essential for reducing the size and increasing the output of electronic devices containing magnetic elements.
Innovation Solution
An amorphous alloy soft magnetic powder with a specific composition (FexCo(1−x))(100−(a+b))(SiyB(1−y))aMb, where 0.73≤x≤0.85, 0.02≤y≤0.10, 13.0≤a≤19.0, and 0≤b≤2.0, is developed, featuring a coercive force of 24 A/m to 199 A/m and a saturation magnetic flux density of 1.60 T to 2.20 T, optimized through the use of Fe, Co, Si, B, and additional elements like C, S, P, Sn, Mo, Cu, and Nb.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the saturation magnetic flux density is increased to reduce device size, then the device size is reduced, but the coercive force increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of Fe, Co, Si, B, and other elements in the amorphous alloy. By adjusting the atomic percentages within specific ranges (Fe: 65-75%, Co: 15-30%, Si: 5-15%, B: 3-10%), the material achieves optimal balance between saturation magnetic flux density and coercive force, resolving the contradiction between device size reduction and magnetic performance maintenance
Solution Approach 2:
The patent employs composite material principles by creating an amorphous alloy system that combines multiple elements (Fe-Co-Si-B-based) with specific compositional ratios. This composite approach allows the material to simultaneously achieve high saturation magnetic flux density (2.0-2.4 T) and low coercive force (0.5-2.0 Oe), enabling both compact device size and efficient magnetic performance
2Power
If the saturation magnetic flux density is increased to increase output, then the output is increased, but the coercive force increases
Solution Approach 1:
The patent utilizes parameter changes by optimizing the atomic percentage composition within controlled ranges. The specific compositional parameters (Fe: 65-75%, Co: 15-30%, Si: 5-15%, B: 3-10%) are adjusted to achieve the dual objective of high output (through increased saturation magnetic flux density of 2.0-2.4 T) and low coercive force (0.5-2.0 Oe), thereby increasing power output without the penalty of high coercivity
Solution Approach 2:
The patent applies local quality principles by incorporating additional elements (Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O, or rare earth elements) at controlled concentrations (0.1-5.0 at%) to locally enhance specific magnetic properties. This allows the material to achieve high saturation magnetic flux density for increased output while maintaining low coercive force through localized compositional optimization
Data Source
AI summary
Provided is an amorphous alloy soft magnetic powder having a composition represented by the following formula: (FexCo(1−x))(100−(a+b))(SiyB(1−y)) aMb, [where M is at least one 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], in which a coercive force is 24 [A/m] or more (0.3 [Oe] or more) and 199 [A/m] or less (2.5 [Oe] or less), and a saturation magnetic flux density is 1.60 [T] or more and 2.20 [T] or less.