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High-abundance rare earth Ce/Y/Nd/La substituted samarium-iron-nitrogen-based magnetic powder with high maximum magnetic energy product

A maximum magnetic energy product, samarium iron nitrogen technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of rising saturation magnetization

Inactive Publication Date: 2020-10-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the combination of rare earth elements Ce / Y / Nd / La or Ce / Y / Nd / La and other rare earth elements partially replaces Sm, from the perspective of intrinsic magnetic properties, the anisotropy of samarium-iron-nitrogen-based rare earth permanent magnet powder decreases, but the saturation magnetization increases

Method used

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  • High-abundance rare earth Ce/Y/Nd/La substituted samarium-iron-nitrogen-based magnetic powder with high maximum magnetic energy product
  • High-abundance rare earth Ce/Y/Nd/La substituted samarium-iron-nitrogen-based magnetic powder with high maximum magnetic energy product
  • High-abundance rare earth Ce/Y/Nd/La substituted samarium-iron-nitrogen-based magnetic powder with high maximum magnetic energy product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Using Sm, Ce, and Fe as raw materials, arc melting is carried out under the protection of argon, and the composition represented by the molecular formula is obtained as (Sm 0.67 Ce 0.33 ) 2 Fe 17 master alloy. Heat the ingot at 1200°C for 12 hours under the protection of argon; carry out preliminary crushing on the ingot to obtain a powder with a particle size of 8-2000 microns; 2 , NH 3 , N 2 -NH 3 , N 2 -H 2 , NH 3 -H 2 Nitriding in at least one of the atmospheres for 0.05-48 hours; the nitriding magnetic powder is further crushed by ball milling to obtain particles with a particle size of 0.1-20 microns. figure 1 It is an X-ray diffraction (XRD) pattern of the nitrided magnetic powder. figure 2 The samarium-iron-nitrogen-based magnetic powder crushed by ball milling is oriented and solidified under a magnetic field of 2.8T in a mixture with epoxy resin, and the obtained hysteresis loop is tested by VSM. (Sm 0.67 Ce 0.33 ) 2 Fe 17 N w The maximum ene...

Embodiment 2

[0029] Using Sm, Ce, Fe, Ti as raw materials, induction melting is carried out under the protection of argon, and the composition expressed by the molecular formula is (Sm 0.6 Ce 0.4 ) 2 (Fe 0.89 Ti 0.11 ) 17 master alloy. Heat the ingot at 1100°C for 12 hours under the protection of argon; carry out preliminary crushing on the ingot to obtain a powder with a particle size of 8-2000 microns; 2 , NH 3 , N2 -NH 3 , N 2 -H 2 , NH 3 -H 2 Nitriding in at least one of the atmospheres for 0.05-48 hours; the nitriding magnetic powder is further crushed by a jet mill to obtain particles with a particle size of 0.1-20 microns. image 3 It is an X-ray diffraction (XRD) pattern of the nitrided magnetic powder. Figure 4 The samarium-iron-nitrogen-based magnetic powder crushed by jet milling is oriented and solidified under a magnetic field of 2.8T in the mixture of epoxy resin, and the hysteresis loop obtained is tested by VSM. (Sm 0.6 Ce 0.4 ) 2 (Fe 0.89 Ti 0.11 ) 17 N...

Embodiment 3

[0032] Using Sm, Ce, Fe, Zr as raw materials, induction melting is carried out under the protection of argon, and the composition expressed by the molecular formula is obtained as (Sm 0.5 Ce 0.5 ) 2 Fe 15 Zr 2 master alloy. Heat the ingot at 1200°C under the protection of argon for 12 hours; preliminarily crush the ingot to obtain a powder with a particle size of 8-2000 microns; hydrogenate the preliminarily crushed powder in a pure hydrogen atmosphere at 600-800°C Treat for 1-5h, then treat in vacuum or inert gas atmosphere at the same temperature for 1-5h. After this HDDR treatment, the grain size of the powder reaches the nanometer level, which contributes to the improvement of the magnetic properties of the final product. Subsequently, the powder was heated at 300-600°C in N 2 , NH 3 , N 2 -NH 3 , N 2 -H 2 , NH 3 -H 2 Nitriding in at least one of the atmospheres for 0.05-48 hours; the nitriding magnetic powder is further crushed by a sand mill to obtain partic...

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Abstract

The invention discloses high-abundance rare earth Ce / Y / Nd / La substituted samarium-iron-nitrogen-based magnetic powder with high maximum magnetic energy product. The samarium-iron-nitrogen magnetic powder comprises the following components as shown in a molecular formula: (Sm<1-x>, REx)u(Fe<1-y-z>, Ty, Mz)vNw, wherein RE is a rare earth element Ce / Y / Nd / La or a combination of Ce / Y / Nd / La and other rare earth elements, and x is greater than or equal to 0.33 and less than or equal to 0.95. The samarium-iron-nitrogen-based magnetic powder has high maximum magnetic energy product, coercive force, residual magnetic induction intensity and high-temperature use performance. The addition of RE leads to improvement of saturation magnetization of the magnetic powder, the anisotropy is slightly reduced,and the addition of T and M can inhibit or counteract reduction of anisotropy of the magnetic powder caused by the addition of RE. RE, T and M are used for improving the saturation magnetization intensity of the magnetic powder and slightly weakening, keeping and even improving the anisotropy of the magnetic powder, and the magnetic powder still keeps a high Curie temperature.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and relates to a high maximum energy product samarium-iron-nitrogen-based rare earth permanent magnet powder substituted by high-abundance rare earth Ce / Y / Nd / La. The magnetic powder is mainly used for preparing anisotropic bonding permanent magnet powder. Magnets can also be used to make sintered magnets. Background technique [0002] In 1990, Professor Coey's research group in Ireland developed Sm by gas-solid reaction. 2 Fe 17 Nw (referred to as samarium iron nitrogen) compound. SmFeN has excellent intrinsic magnetic properties, for example, the Curie temperature is as high as 473°C, the saturation magnetization is about 15kGs, and the anisotropy field H A Up to 140kOe. In addition to having magnetic properties comparable to NdFeB, SmFeN has better oxidation resistance and corrosion resistance than NdFeB. Although the initial degradation temperature of about 600 °C prev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/059
CPCH01F1/059
Inventor 郑精武徐健伟乔梁车声雷蔡伟李涓李旺昌应耀余靓
Owner ZHEJIANG UNIV OF TECH
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