Iron-Based Amorphous Alloy Composition for High Ms and Low Hc
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Solution Overview
Problem
Existing iron-based amorphous alloys face a challenge in achieving both high saturation magnetization and low coercivity, as increasing the iron content for higher magnetization often leads to crystalline phase precipitation.
Innovation Solution
An iron-based amorphous alloy composition with specific ranges for Fe, Si, B, P, and C content (76.0 ≤ a ≤ 80.0, 3.0 ≤ b ≤ 6.9, 9.9 ≤ c ≤ 14.0, 0.8 ≤ d ≤ 4.6, 1.0 ≤ e ≤ 4.1) and a supercooling degree of ΔTx ≥ 100 K, allowing for both high saturation magnetization (Ms ≥ 155 emu/g) and low coercivity (Hc ≤ 300 A/m).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the iron content is increased to achieve high saturation magnetization, then the saturation magnetization Ms is improved, but the crystalline phase precipitates leading to increased coercivity Hc
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of multiple elements (Fe: 76-80%, Si: 3-6.9%, B: 9.9-14%, P: 0.8-4.6%, C: 1-4.1%) to achieve the desired magnetic properties. This quantitative adjustment of compositional parameters resolves the contradiction between high saturation magnetization and low coercivity.
Solution Approach 2:
The patent creates a composite amorphous alloy system combining Fe with Si, B, P, and C elements. This composite material approach allows the alloy to achieve both high saturation magnetization (≥155 emu/g) and low coercivity (≤300 A/m) simultaneously, overcoming the limitation of pure iron-based alloys where increased iron content leads to crystalline phase precipitation.
2Quantity of substance
If the iron content is increased to achieve high saturation magnetization, then the saturation magnetization Ms is improved, but the amorphous phase stability deteriorates
Solution Approach 1:
The patent employs parameter changes by optimizing the composition ratios within specific ranges to maintain amorphous phase stability while achieving high saturation magnetization. The controlled addition of Si (3-6.9%), B (9.9-14%), P (0.8-4.6%), and C (1-4.1%) prevents crystalline phase precipitation even at high iron content (76-80%).
Solution Approach 2:
The patent introduces Si, B, P, and C elements as intermediary substances that mediate between the high iron content requirement for saturation magnetization and the amorphous phase stability requirement. These intermediary elements prevent direct interaction between iron atoms that would lead to crystalline phase formation, thereby maintaining amorphous structure stability.
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 solution enables the production of powdery/granular materials with enhanced magnetic properties, suitable for compacted powder materials, achieving both high saturation magnetization and low coercivity.
Implementation Method 1
Powdery/granular material made of a soft magnetic iron-based amorphous alloy... exhibit excellent magnetic properties
Implementation Method 2
the supercooling improvement element M is an element having a function of facilitating amorphization of the iron-based amorphous alloy
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(f)
Figure 3
AI summary
To achieve both a high saturation magnetization Ms and a low coercivity Hc in an iron-based amorphous alloy. An iron-based amorphous alloy is an iron-based amorphous alloy represented by a composition formula FeaSibBcPdCe, the composition ratio a satisfying 76.0 ≤ a ≤ 80.0, the composition ratio b satisfying 3.0 ≤ b ≤ 6.9, the composition ratio c satisfying 9.9 ≤ c ≤ 14.0, the composition ratio d satisfying 0.8 ≤ d ≤ 4.6, the composition ratio e satisfying 1.0 ≤ e ≤ 4.1.