Flattened FeNi Magnetic Particles for Higher Coercivity
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Solution Overview
Problem
Existing magnetic materials with an L10-type ordered structure, such as FeNi alloys, face challenges in achieving high coercivity and maintaining a stable, flat shape, which are crucial for applications in high-performance magnets.
Innovation Solution
The manufacturing process involves flattening FeNiN particles and performing denitriding treatment to produce magnetic particles with a specific shape and high degree of order, incorporating a coating layer to interrupt magnetic coupling and enhance coercivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FeNi ordered alloy powder with L10-type ordered structure is used to achieve high magnetic anisotropy, then magnetic performance is improved, but particle shape stability and flatness deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the degree of order parameter (long-range order parameter) to be 0.7 or higher, and specifically 0.85 or higher for flattened particles. This parameter control ensures high magnetic anisotropy while maintaining shape stability. The manufacturing process parameters (flattening treatment, heat treatment temperature ranges of 400-700°C) are optimized to achieve the desired degree of order without compromising particle shape.
Solution Approach 2:
The patent creates a composite structure by combining FeNi ordered alloy particles with specific shapes (flattened, plate-like, or needle-like) and controlling their internal atomic ordering. The composite nature arises from the combination of specific particle morphology with high degree of order (0.7-1.0), resulting in materials that simultaneously achieve high coercivity and shape stability for magnetic applications.
2Ease of manufacture
If conventional manufacturing processes are used for FeNi alloys, then production simplicity is maintained, but coercivity and magnetic stability deteriorate
Solution Approach 1:
The patent applies preliminary action by performing flattening treatment on FeNi alloy particles before final heat treatment to establish the L10-type ordered structure. This preliminary shaping step creates the necessary particle morphology (flat, plate-like, or needle-like shapes) that enables subsequent optimization of magnetic properties through controlled ordering, achieving high coercivity while maintaining manufacturing feasibility.
Solution Approach 2:
The patent optimizes manufacturing parameters including heat treatment temperature (400-700°C), time (1-24 hours), and atmosphere control to achieve the desired degree of order (0.7 or higher). These parameter changes transform conventional simple heating into a controlled process that simultaneously achieves shape stabilization and high coercivity through enhanced atomic ordering in the L10 structure.
3Shape
If particle flattening is performed to achieve flat shape, then shape anisotropy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the flattening treatment parameters (intensity, duration, temperature) to achieve the desired flat shape with minimal process complexity. The key is controlling the degree of order to be 0.7 or higher after flattening, which can be achieved through straightforward heat treatment parameters (400-700°C for 1-24 hours) without requiring complex multi-step manufacturing sequences.
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 resulting magnetic particles exhibit enhanced coercivity and stability, maintaining a flat shape with an easy magnetization axis aligned along the flat surface, suitable for high-performance magnetic applications.
Implementation Method 1
Magnetic materials having an L10-type ordered structure, which is a superlattice structure, are expected to be used as magnet materials and magnetic recording materials due to their high magnetic anisotropy
Implementation Method 2
The magnetic particles may individually have a flat shape in which a major axis and a minor axis shorter than the major axis intersect each other
Implementation Method 3
A manufacturing method of a magnetic body includes flattening FeNiN particles and performing a denitriding treatment on the FeNiN particles that have been flattened
Data Source
AI summary
In a magnetic body including magnetic particles that contain an FeNi ordered alloy having an L10-type ordered structure, the magnetic particles individually have a flat shape in which a major axis and a minor axis shorter than the major axis intersect each other, and a flat surface along the major axis is larger than a side surface along the minor axis. An easy magnetization axis of the L10-type ordered structure lies along the flat surface.