Soft Magnetic Alloy Composition for High Saturation and Corrosion Resistance
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Solution Overview
Problem
Soft magnetic alloys face a trade-off between achieving high saturation magnetic flux density and maintaining corrosion resistance, as increasing the Fe content typically decreases corrosion resistance.
Innovation Solution
A soft magnetic alloy composition including Mn and specific elements within defined ranges, optimized to achieve both high saturation magnetic flux density and corrosion resistance, with a compositional formula of ((Fe(1−(α+β))CoαNiβ)1−γX1γ)(1−(a+b+c+d+e)>BaPbSicCdCre, where Mn is between 0.002 and 3.0 at%, and other elements are carefully proportioned to enhance corrosion potential and current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the Fe amount is increased to attain a high saturation magnetic flux density Bs, then the saturation magnetic flux density is improved, but the corrosion resistance tends to decrease
Solution Approach 1:
The invention changes the compositional parameters by introducing Mn and Co at specific ratios (Mn: 0.002-3.0 at%, Co: 0.005-1.0 at%) while controlling Fe content, thereby achieving a new parameter space where both high saturation magnetic flux density (1.5 T or more) and high corrosion resistance (potential ≥-630 mV, current density ≤45 μA/cm²) are simultaneously realized
Solution Approach 2:
The invention creates a composite soft magnetic alloy system combining Fe, Mn, Co, and optional additional elements (Ni, Cu, Al, Si, etc.) in specific proportions, where the synergistic interaction between components achieves both magnetic performance (Bs ≥ 1.5 T) and corrosion resistance through the composite effect of multiple elements
Data Source
AI summary
A soft magnetic alloy and the like which simultaneously satisfy a high saturation magnetic flux density Bs and a high corrosion resistance. A soft magnetic alloy includes Mn and a component expressed by a compositional formula of ((Fe(1−(α+β))CoαNiβ)1−γX1γ)(1−(a+b+c+d+e))BaPbSicCdCre (atomic ratio). X1 is one or more selected from Ti, Zr, Hf, Nb, Ta, Mo, W, Al, Ga, Ag, Zn, S, Ca, Mg, V, Sn, As, Sb, Bi, N, O, Au, Cu, rare earth elements, and platinum group elements. Further, a to e and α to γ are within predetermined ranges. Mn amount f (at %) is within a range of 0.002≤f<3.0. The soft magnetic alloy satisfies a corrosion potential of −630 mV or more and −50 mV or less and a corrosion current density of 0.3 μA/cm2 or more and 45 μA/cm2 or less.