Nitrogen-contained rare earth magnetic powder and preparation method thereof

A rare earth magnetic powder and rare earth technology, applied in the field of preparation of nitrogen-containing rare earth magnetic powder, can solve the problems of small powder diameter, large specific surface area of ​​magnetic powder, large surface activity, etc., to prevent oxidation of magnetic powder, short nitriding time, and high nitriding temperature low effect

Active Publication Date: 2011-04-20
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following problems in the R-Fe-N magnetic powder and its preparation method in the existing patents: when the R-Fe alloy powder starts nitriding, there is a phenomenon of continuous and uneven distribution of nitrogen content, and it is necessary to prolong the nitriding time to promote the homogenization of the magnetic powder nitriding, and Nitriding for a long time will cause R-Fe-N magnetic powder to decompose into RN and α-Fe; R-Fe powder or pure Sm powder, Fe powder according to Sm 2 Fe 17 The diameter of the powder dispensed from the ingredients is small, the specific surface area of ​​the magnetic powder is large, and its surface activity is large, so it is easy to oxidize when it is directly nitrided in nitrogen-containing gas

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The prepared 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 Sm-Fe alloy cast sheets with an average thickness of 0.05-1.0 mm. The obtained Sm-Fe alloy casting sheet is added with 15wt% organic compound, wherein the organic compound composition is 30wt% of the cene compound (ferrocene: Sm=1: 15) and the balance is methyl alcohol and butanol (methanol: Butanol=5:1), vacuumize to less than 3×10 -3 NH after Pa 3 -H 2 To 5atm, incubate at 450°C for 1 hour to obtain the composition Sm 2 Fe 17 N 3.5The nitrogen-containing rare earth alloy was cast into flakes, and then ball-milled into magnetic powder with a particle size of 0.3-50 μm. The magnetic properties and nitrogen content of the magnetic powder are shown in Table 1.

Embodiment 2

[0024] The prepared 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 Sm-Fe alloy cast sheets with an average thickness of 0.05-1.0 mm. The obtained Sm-Fe alloy casting sheet is added with 6wt% organic compound, wherein the organic compound added composition is 70wt% of the cene compound (ferrocene: Sm=1:33) and the balance is urea and yellow blood salt ( Urea: yellow blood salt = 5: 1), vacuumize to less than 3 × 10 -3 N after Pa 2 Mix the gas to 6atm, keep it at 450°C for 3 hours to obtain the composition Sm 2 Fe 17 N 3.0 The nitrogen-containing rare earth alloy was cast into flakes, and then ball-milled into magnetic powder with a particle size of 0.3-50 μm. The magnetic properties and nitrogen content of the magnetic powder are shown in Table 1.

Embodiment 3

[0026] The prepared 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 Nd-Fe alloy cast sheets with an average thickness of 0.05-1.0 mm. The obtained Nd-Fe alloy cast piece is broken into, add 14wt% organic compound, wherein the organic compound addition composition is the cene compound (ferrocene: cene Nd=1: 19) of 42wt% and the balance is carboxylic acid rare earth and Rare earth naphthenate (rare earth carboxylate: rare earth naphthenate = 5:1), vacuumize to less than 3×10 -3 NH after Pa 3 -H 2 Mix the gas to 2atm, keep it at 450°C for 2 hours to obtain the composition of Nd 2 Fe 17 N 4.0 The nitrogen-containing rare earth alloy was cast into flakes, and then ball-milled into magnetic powder with a particle size of 0.3-50 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 preparation method of nitrogen-contained rear earth magnetic powder which takes dicyclopentadienyl iron, alum rare earth, metallic iron and rare earth as main raw materials and has the main component of R2Fe(17-x)MxNy, wherein R stands for one or several of 17 rear earth elements containing Sc and Y; M is one or a plurality of transition elements of Al, Ga, In, Si, Ge, Sn, Pb, Mg and Ca except Fe; x=0-5 and y=1-6. The preparation method comprises the following steps: preparation process of R2Fe(17-x)Mx alloy casting; nitridation process; and milling process.

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 method for preparing nitrogen-containing rare earth magnetic powder by using ferrocene, rare earth, metallic iron and rare earth as main raw materials. 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. in R 2 Fe 17 N x In the compound, Sm 2 Fe 17 N x The compound has superior comprehensive performance, and Nd 2 Fe 14 Compared with B, it has a higher Curie temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057B22F9/04
Inventor 李红卫黄小卫于敦波胡权霞李扩社罗阳
Owner GRIREM ADVANCED MATERIALS CO LTD
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