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Preparation method of high-performance anisotropic Sm-Fe-N permanent magnet

An anisotropic, permanent magnet technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of irreversible decomposition and inability to sinter to obtain Sm2Fe17Nx anisotropic permanent magnets, etc.

Active Publication Date: 2017-02-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the Sm2Fe17Nx compound will irreversibly decompose above 600°C to form α-Fe and Sm-N compounds, and cannot be sintered at a temperature higher than 600°C to obtain an anisotropic permanent magnet of Sm2Fe17Nx

Method used

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Effect test

Embodiment 1

[0019] Rare earth Sm, industrial pure iron, metal Cu and Al are used as raw materials, according to Sm 11.5 Fe 87.5 Al 0.4 Cu 0.6 For ingredients, considering that Sm is easy to volatilize, add 15% more burning loss, and use a vacuum induction furnace to melt the alloy. The alloy thin strip with a thickness of 0.2-0.4mm was prepared by the quick-setting casting process, and the XRD analysis proved that the Sm2Fe17 phase was mainly formed. The electron microscope observation of the thin strip section showed the formation of a 2-6μm thick flaky grain with a grain boundary. Rich in Al and Cu. Vacuum heat treatment at 750°C for 1.5 hours and then air-cooled to break the cast sheet into particles of about 200 μm; then nitriding at 480°C for 6 hours, and nitriding to Sm through gas-solid reaction 2 Fe 17 Nx; and then crushed by ball milling into a particle size of 3-5 microns to obtain anisotropic Sm 2 Fe 17 Nx magnetic powder. in Sm 2 Fe 17 Add Pr with a weight fraction o...

Embodiment 2

[0021] Rare earth Sm and industrial pure iron are used as raw materials, according to Sm 10.5 Fe 89.50 For ingredients, considering that Sm is easy to volatilize, add 15% more burning loss, and use vacuum induction furnace to melt Sm-Fe alloy. The alloy thin strip with a thickness of 0.2-0.4mm was prepared by the quick-setting casting process, and the XRD analysis proved that the Sm2Fe17 phase was mainly formed. The electron microscope observation of the thin strip section showed the formation of a 2-6μm thick flaky crystal. Vacuum heat treatment at 750°C for 1.5 hours and then air-cooled to break the cast sheet into particles of about 200 μm; then nitriding at 480°C for 6 hours, and nitriding to Sm through gas-solid reaction 2 Fe 17 Nx; then crushed by ball milling into anisotropic Sm with a particle size of 3-5 microns 2 Fe 17 Nx magnetic powder. By vapor deposition method in Sm 2 Fe 17 Zn deposited on the surface of Nx magnetic powder with a thickness of 50nm 80 Al ...

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Abstract

The invention relates to a preparation method of a high-performance anisotropic Sm-Fe-N permanent magnet, and belongs to the field of rare earth permanent magnet materials. The preparation method is characterized in that anisotropic Sm2Fe17Nx alloy powder and a little low-melting-point metal / alloy powder are mixed, or a layer of low-melting-point metal / alloy membrane coats the surface of the anisotropic Sm2Fe17Nx alloy powder; then, orientation profiling is preformed in a magnetic field; hot pressing sintering is performed at 480 to 520 DEG C for compaction; the high-performance anisotropic Sm-Fe-N permanent magnet is obtained. The low-melting-point metal / alloy ingredient consists of R-M, R-N, R-(M,N) or N-N; the melting point range is 300 to 450 DEG C; R is one or more than one from La, Ce, Pr, Nd, Gd, Tb, Dy and Ho; M is one or more than one of Fe, Co and Ni; N is one or more than one from Cu, Al, Ga, Zn, Sn and Ag. The preparation method has the advantages that the high-density anisotropic Sm2Fe17Nx permanent magnet can be prepared, so that high permanent-magnet performance can be obtained.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a method for preparing a high-performance anisotropic Sm-Fe-N permanent magnet. Background technique [0002] Sm2Fe17Nx rare earth permanent magnet material has excellent intrinsic magnetic properties, its saturation magnetization reaches 1.54T, and (BH)max can reach 472.0kJ / m 3 , completely comparable to Nd-Fe-B; the Curie temperature is 470°C, which is 160°C higher than that of Nd-Fe-B permanent magnets; the anisotropy field is 14T, much higher than about 7T of Nd-Fe-B; And its corrosion resistance, thermal stability, and oxidation resistance are also better than Nd-Fe-B permanent magnet materials, so Sm2Fe17Nx rare earth permanent magnet materials have broad prospects. [0003] The binary Sm2Fe17 compound has an easy base plane and a low anisotropy field, so it cannot be made into a permanent magnet with practical significance. In 1990, Coey and others de...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02B22F1/02B22F3/14
CPCH01F1/0572H01F1/0575H01F41/0273B22F3/14B22F2003/145B22F1/17
Inventor 包小倩高学绪高硕马斌
Owner UNIV OF SCI & TECH BEIJING
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