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A kind of method for preparing high coercive force samarium iron nitrogen magnet from nitrogen rare earth complex

A technology of rare earth complexes and high coercive force, applied in the fields of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of difficult industrial production, grain growth, and low efficiency, and achieve the goal of improving nitrogen effect, enhance the effect of magnetocrystalline anisotropy

Active Publication Date: 2019-08-30
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of SmFeN permanent magnet materials at home and abroad basically first crushes the samarium-iron alloy or ball mills it for nitriding. Low, the stability of magnetic properties is difficult to be effectively guaranteed, and it is difficult to realize industrial production
China's magnetic material manufacturers are also constantly developing high-performance SmFeN permanent magnet technology, mainly by adding some heavy rare earth elements (Dy and Tb) to improve the magnetic properties of the magnet, but due to the addition of heavy rare earth elements in the smelting process, It cannot effectively ensure its uniform distribution. At the same time, in the subsequent sintering process, due to the abnormal growth of grains, it cannot be effectively controlled, resulting in excessive doping of heavy rare earths, which will increase costs and waste resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Sm and Fe alloys with a purity of 99.99% or more, according to the nominal composition of the alloy Sm 2 Fe 17 Weigh the raw materials of each element and carry out vacuum melting. The alloy is repeatedly smelted 5 times to obtain a master alloy ingot with uniform composition, and then made into a thin strip in a rapid quenching furnace. The cavity pressure of the rapid quenching furnace is 0.05MPa. is 0.09MPa, and the linear speed of the roller is 35m / s;

[0017] 2) Sm prepared in step (1) 2 Fe 17 The thin strip is subjected to crystallization heat treatment at 650°C under the protection of argon to obtain the corresponding nanocrystalline alloy;

[0018] 3) Sm prepared in step (2) 2 Fe 17 Nanocrystalline thin ribbons in high-purity N 2 Nitriding treatment was carried out in the air, the nitriding temperature was 450°C, and the nitriding time was 8 hours to obtain Sm 2 Fe 17 N x nanocrystalline alloys;

[0019] 4) Sm prepared in step (3) 2 Fe 17 N x Nan...

Embodiment 2

[0024] 1) Sm and Fe alloys with a purity of 99.99% or more, according to the nominal composition of the alloy Sm 2 Fe 17 Weigh the raw materials of each element and carry out vacuum melting. The alloy is repeatedly smelted 5 times to obtain a master alloy ingot with uniform composition, and then made into a thin strip in a rapid quenching furnace. The cavity pressure of the rapid quenching furnace is 0.05MPa. is 0.09MPa, and the linear speed of the roller is 40m / s;

[0025] 2) Sm prepared in step (1) 2 Fe 17 The thin strip is subjected to crystallization heat treatment at 700°C under the protection of argon to obtain the corresponding nanocrystalline alloy;

[0026] 3) Sm prepared in step (2) 2 Fe 17 Nanocrystalline thin ribbons in high-purity N 2 Nitriding treatment was carried out in the air, the nitriding temperature was 450°C, and the nitriding time was 10 hours to obtain Sm 2 Fe 17 N x nanocrystalline alloys;

[0027] 4) Sm prepared in step (3) 2 Fe 17 N x Na...

Embodiment 3

[0032] 1) Sm and Fe alloys with a purity of 99.99% or more, according to the nominal composition of the alloy Sm 2 Fe 17 Weigh the raw materials of each element and carry out vacuum melting. The alloy is repeatedly smelted 5 times to obtain a master alloy ingot with uniform composition, and then made into a thin strip in a rapid quenching furnace. The cavity pressure of the rapid quenching furnace is 0.05MPa. is 0.09MPa, and the linear speed of the roller is 45m / s;

[0033] 2) Sm prepared in step (1) 2 Fe 17 The thin ribbon is subjected to crystallization heat treatment at 750°C under the protection of argon to obtain the corresponding nanocrystalline alloy;

[0034] 3) Sm prepared in step (2) 2 Fe 17 Nanocrystalline ribbons in high-purity NH 3 Nitriding treatment was carried out in the air, the nitriding temperature was 500°C, and the nitriding time was 10 hours to obtain Sm 2 Fe 17 N x nanocrystalline alloys;

[0035] 4) Sm prepared in step (3) 2 Fe 17 N x Nanoc...

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Abstract

The invention discloses a method for preparing a samarium ferronitrogen magnet with high coercivity by a nitrogen rare earth complex, belonging to the technical field of magnetic materials. The Sm2Fe17Nx nanocrystalline thin ribbon is immersed in a mixed solution of nitrogen rare earth complex and absolute ethanol, The addition of nitrogen-based rare earth complexes can further enhance the nitriding effect of SmFeN magnets, thus effectively enhancing the magneto-crystalline anisotropy and coercivity of the main phase. The invention has the advantages of simple process, easy operation, low cost, and is favorable for the application of samarium ferronitrogen magnetic powder with high coercivity in more permanent magnetic devices to meet the market demand.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a high-coercivity samarium-iron-nitrogen magnet from a nitrogen-based rare earth complex. Background technique [0002] Rare earth permanent magnet materials are alloys formed of rare earth Nd, Sm, Pr and other elements and some transition metal elements, and are prepared through specific processes to form special materials with permanent magnetic properties. At present, they have been widely used in motors, generators, nuclear magnetic resonance In imagers, microwave communication technology, instruments and other devices and equipment that require permanent magnetic fields. At present, the most widely used rare earth permanent magnet materials are mainly: SmCo 5 Type, Sm 2 co 17 Type and NdFeB permanent magnets. At the same time, SmFeN permanent magnet materials have attracted people's attention for their excellent magnetic properties and g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/059H01F41/02
Inventor 吴琼泮敏翔葛洪良俞能君
Owner CHINA JILIANG UNIV
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