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Nitrogen-containing rare-earth magnetic powder and preparation method thereof

A rare earth magnetic powder and rare earth technology, which is applied in the field of nitrogen-containing rare earth magnetic powder and its preparation, can solve the problems of prolonging the nitriding time, reducing the magnetic properties of R-Fe-N magnetic powder, and continuously uneven distribution of nitrogen content, and achieving increased diffusion speed, nitriding temperature is low, and the effect of increasing nitrogen diffusion speed

Active Publication Date: 2009-09-30
GUOKE RE ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006]The above patents on R-Fe-N magnetic powder generally use R and Fe as the main raw materials to prepare R-Fe powder, and then directly nitriding in nitrogen-containing gas to form R-Fe-N magnetic powder, but when the R-Fe alloy powder starts nitriding, there is a phenomenon that the nitrogen content is continuously distributed and uneven, and it is necessary to prolong the nitriding time to promote the uniform nitriding of the magnetic powder.
Nitriding for a long time will cause the R-Fe-N magnetic powder to decompose into RN and α-Fe, resulting in a decrease in the magnetic properties of the R-Fe-N magnetic powder

Method used

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  • Nitrogen-containing rare-earth magnetic powder and preparation method thereof
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  • Nitrogen-containing rare-earth magnetic powder and preparation method thereof

Examples

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Embodiment 1

[0025] The smelted Sm-FeCo alloy is melted under the protection of an inert gas, and sprayed under pressure through the pores at the bottom of the container onto the outer edge of a water-cooled copper roller rotating at high speed, cooling rapidly and forming amorphous or microcrystalline thin strips. The obtained Sm-FeCo amorphous or microcrystalline strips are homogenized and crushed into powders with a particle size of 20-40 μm. Add 20wt% of organic compounds, wherein the organic compound composition is 20wt% of the acene compound (ferrocene:rare earth=1:49) and the balance is isobutanol, propanol and isopropanol (isobutanol:propanol: Isopropanol=1:1:1), vacuumize to less than 3×10 -3 Pass into N after Pa 2 To 1atm, keep it at 450°C for 1 hour to obtain the composition Sm 2 Fe 15.2 co 1.8 N 1.0 The nitrogen-containing rare earth magnetic powder is ball-milled into a magnetic powder with a particle size of 0.3-10 μm. The magnetic properties and nitrogen content of the...

Embodiment 2

[0029] The raw materials are smelted in the crucible, and then the alloy liquid is cast on the rotating water-cooled roller in a planar flow through the casting trough to form the Sm-FeAlCrGa alloy cast sheet. The obtained Sm-FeAlCrGa alloy cast flakes were crushed into powders with a particle size of 30-40 μm. Add 1wt% of organic compound, wherein the organic compound composition is 80wt% of the cene compound (ferrocene: rare earth = 1:4) and the balance is methanol, vacuumize to less than 3 × 10 -3 Pass into NH after Pa 3 -H 2 Mix the gas to 1atm, keep it at 450°C for 1 hour to obtain the composition Sm 2 Fe 16 (Al 0.03 Cr 0.03 Ga 0.04 )N 2.8 The nitrogen-containing rare earth magnetic powder is ball milled into a magnetic powder with a particle size of 10-20 μm. The magnetic properties and nitrogen content of the magnetic powder are shown in Table 1.

Embodiment 3

[0033] The industrial pure metals Sm, Fe, Zr, Nb are used as raw materials, smelted in a vacuum induction furnace under the protection of argon and cast into Sm-FeZrNb alloy ingots. Add 5wt% organic compound, wherein the organic compound composition is 70wt% of the cene compound (ferrocene: cene Sm=1:9) and the balance is methanol, vacuumize to less than 3 * 10 -3 NH after Pa 3 -H 2 Mix the gas to 1.5atm, keep it at 450°C for 1 hour to obtain the composition Sm 2 Fe 15.5 (Zr 1.0 Nb 0.5 )N 2.9 The nitrogen-containing rare earth magnetic powder is ball-milled into a magnetic powder with a particle size of 10-20 μm. The magnetic properties and nitrogen content of the magnetic powder are shown in Table 1.

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Abstract

The invention discloses a nitrogen-containing rare-earth magnetic powder prepared by taking ferrocene, cyclopentadienyl lanthanide, metallic iron and rare earth as the main raw materials. The nitrogen-containing rare-earth magnetic powder comprises the following component of R2Fe17-xMxNy, wherein the R is one or more kinds of 17 kinds of rare earth elements including Sc and Y, the M includes transitional elements except for Fe and is one or more kinds of Al, Ga, In, Si, Ge, Sn, Pb, Mg and Ca, the x is equal to 0 to 5, and the y is equal to 1 to 6; and the preparation method comprises the following steps: working procedure of preparation of the R2Fe17-xMx compound powder; working procedure of nitridation; and working procedure of magnetic powder refining and nitriding.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials and their preparation, and in particular provides a nitrogen-containing rare earth magnetic powder prepared by using ferrocene, rare earth, metallic iron and rare earth as main raw materials and a preparation method thereof. technical background [0002] In 1990, Coey and Sun Hong reported the use of gas-solid phase reactions to introduce N atoms into R 2 Fe 17 Compound, successfully synthesized R 2 Fe 17 N x Interstitial intermetallic compounds have attracted great attention in the magnetic field, and have rapidly entered a research climax. R 2 Fe 17 After the compound absorbs nitrogen, the crystal structure remains unchanged, the volume of the unit cell expands, and the Curie temperature increases significantly. SM 2 Fe 17 N x The Curie temperature is about 740K, which is higher than that of Nd 2 Fe 14 The Curie temperature Tc (580K) of B is about 160K h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/06B22F9/00
Inventor 李红卫黄小卫于敦波胡权霞李扩社罗阳
Owner GUOKE RE ADVANCED MATERIALS CO LTD
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