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Low-Nd anisotropic Nd2Fe14B/alpha-Fe composite nanocrystalline magnet and preparation method thereof

A nd2fe14b, anisotropic technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of soft magnetic phase content limitation, unfavorable magnetic properties, and difficulty in achieving high saturation magnetization of magnets, etc. Achieve the effect of improving strength and corrosion resistance and reducing production cost

Inactive Publication Date: 2009-12-02
YANSHAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

At present, the composite nanocrystalline permanent magnet materials actually prepared are mostly isotropic. Although Lee et al. The content of the phase is greatly limited (less than 5%), so it is difficult to achieve a high saturation magnetization of the magnet, which is not conducive to the further improvement of the magnetic properties
At present, in the Nd-Fe-B alloy with low Nd (Nd<10%), it has not been reported to obtain an anisotropic bulk composite nanocrystalline permanent magnet containing more than 20% α-Fe phase

Method used

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  • Low-Nd anisotropic Nd2Fe14B/alpha-Fe composite nanocrystalline magnet and preparation method thereof
  • Low-Nd anisotropic Nd2Fe14B/alpha-Fe composite nanocrystalline magnet and preparation method thereof

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Embodiment

[0016] Nd 9 Fe 85 B 6 The alloy is prepared on a single-roll spinning machine at a linear speed of 40m / s to produce Nd with a width of 2mm and a thickness of about 25μm. 9 Fe 85 B 6 The amorphous ribbon is then crushed and powdered, with a particle size below 500μm. Nd 9 Fe 85 B 6 The alloy powder is loaded into the mold (e.g. figure 1 ), the mold is composed of a clamp 1, a temperature control thermoelectric corner 2, a stone black sleeve 3, a pressure head 4, an internal female mold 5, an external female mold 6 and a temperature measuring electrical corner 8. The indenter 4 is made of tungsten carbide YG19, the inner female mold 5 is made of WC, and the outer female mold 6 is made of Cr3W2V8. The female mold is composed of the inner female mold 5 and the outer female mold 6. Put the stone black sleeve 3 into the female mold, and put the Nd-Fe-B alloy powder 7 in the stone black sleeve 3, and finally put the mold in the vacuum chamber 9. Under vacuum conditions, hot press for 30...

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Abstract

The invention discloses a low-Nd anisotropic Nd2Fe14B / alpha-Fe composite nanocrystalline magnet and a preparation method thereof. The nanocrystalline magnet of the low-Nd anisotropic Nd2Fe14B / alpha-Fe composite nanocrystalline magnet is compounded from two phases of Nd2Fe14B and alpha-Fe, the content of the alpha-Fe phase in the nanocrystalline magnet is between 20 and 40 percent, and the Nd2Fe14B phase grows in grain orientation and has a [001] crystallographic texture in the compressive stress direction; and the composite nanocrystalline magnet has obvious magnetic anisotropy in the directions parallel and vertical to the compressive stress direction. The preparation method comprises the following steps: applying a method of performing thermal deformation on a low-Nd noncrystal NdxFe94-xB6 (x is more than or equal to 6 and is less than or equal to 10) alloy, and using a uniaxial compressive stress to control the nucleation and the growth of a nanocrystalline in a noncrystal substrate to make the Nd2Fe14B phase grow in the grain orientation so as to prepare the low-Nd anisotropic Nd2Fe14B / alpha-Fe composite nanocrystalline magnet. The increase of the content of a soft magnetism phase of the alpha-Fe phase in the magnet not only can reduce the production cost, but also can improve the strength and the corrosion resistance of the magnet.

Description

Technical field [0001] The invention relates to a functional material and a manufacturing method thereof, in particular to a low Nd anisotropy Nd 2 Fe 14 B / α-Fe composite nanocrystalline magnet and preparation method. Background technique [0002] Permanent magnet materials can be widely used in fields such as motors, generators, computers, automobiles, and maglev trains, and play an important role in the development of the national economy. Composite nanocrystalline permanent magnetic materials, as a new type of permanent magnetic materials, have attracted much attention since they came out in 1989. Its characteristic is to combine the soft magnetic phase with high saturation magnetization (such as: α-Fe) and the hard magnetic phase with high coercivity (such as: Nd 2 Fe 14 B) Exchange coupling under nanometer size to become a dual-phase composite permanent magnet material with high remanence and high coercivity. Micromagnetic calculations show that the maximum magnetic energy p...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/14
Inventor 张湘义刘延国
Owner YANSHAN UNIV
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