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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: 2009-12-09
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
  • 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 a crucible, and then the alloy liquid is cast on a rotating water-cooled roller in a plane flow through a casting trough to form an Sm-Fe alloy cast sheet with an average thickness of 0.05-1.0mm. The obtained Sm-Fe alloy cast piece was added with 15wt% organic compound, in which the organic compound component was 30wt% of the locene compound (ferrocene: Sm = 1:15) and the balance was methanol and butanol (methanol: Butanol=5:1), evacuated to less than 3×10 -3 Charge NH after Pa 3 -H 2 To 5atm, keep it at 450℃ for 1 hour to obtain the composition as Sm 2 Fe 17 N 3.5The nitrogen-containing rare-earth alloy cast pieces were ball-milled into magnetic powder with a particle size of 0.3-50μm. 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 a crucible, and then the alloy liquid is cast on a rotating water-cooled roller in a plane flow through a casting trough to form an Sm-Fe alloy cast sheet with an average thickness of 0.05-1.0mm. The obtained Sm-Fe alloy cast piece was added with 6 wt% of organic compounds, of which the organic compound was 70 wt% of the locene compound (ferrocene: Sm = 1:33) and the balance was urea and yellow blood salt ( Urea: yellow blood salt = 5:1), vacuum to less than 3×10 -3 Pa after charging N 2 Mix the gas to 6atm, keep it at 450℃ for 3 hours to obtain the composition as Sm 2 Fe 17 N 3.0 The nitrogen-containing rare-earth alloy cast pieces were ball-milled into magnetic powder with a particle size of 0.3-50μm. 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 a crucible, and then the alloy liquid is cast on a rotating water-cooled roller in a plane flow through a casting trough to form a Nd-Fe alloy cast sheet with an average thickness of 0.05-1.0mm. The obtained Nd-Fe alloy cast piece was broken into pieces, and 14wt% of organic compounds were added, of which the organic compound was added with 42wt% of the locene compound (ferrocene: ferrocene: Nd=1:19) and the balance was the rare earth carboxylate and Rare earth naphthenic acid (rare earth carboxylate: rare earth naphthenate = 5:1), evacuated to less than 3×10 -3 Charge NH after Pa 3 -H 2 Mix the gas to 2atm, keep it at 450℃ for 2 hours to obtain the composition of Nd 2 Fe 17 N 4.0 The nitrogen-containing rare-earth alloy cast pieces were ball-milled into magnetic powder with a particle size of 0.3-50μm. 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 magnetic materials and their preparation, and in particular provides a preparation method for preparing nitrogen-containing rare earth magnetic powder using ferrocene, rare earth ocene, 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 reaction to introduce N atoms into R 2 Fe 17 Among the compounds, successfully synthesized R 2 Fe 17 N x Intermetallic compounds of interstitial atoms have attracted great attention from the field of magnetism and quickly entered the research climax. R 2 Fe 17 After the compound absorbs nitrogen, the crystal structure does not change, the unit cell volume 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 Cur...

Claims

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Application Information

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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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