Rare earth alloy

A rare earth alloy and alloy technology, which is applied in the field of Nd-Fe-B permanent magnet materials, can solve the problems of reducing the coercive force of magnets and the like

Inactive Publication Date: 2008-08-13
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As long as the Nd in contact with the Nd-rich phase thin layer 2 Fe 14 The surface layer of the B crystal grain has a composition inhomogeneous area with a thickness of 5-6nm, which will make the magnetocry

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] The R1R2M alloy in this embodiment is a NdDyFe alloy, and its preparation method is as follows: a graphite crucible is used as a reactor and an iron rod is used as a cathode to obtain it by electrolysis. The electrolyte is 50wt% neodymium fluoride, 30wt% dysprosium fluoride, 20wt% lithium fluoride, direct current electrolysis, average current intensity 2200A, cathode current density 12A / cm 2 , Electrolysis temperature maintained at 1000 ~ 1020 ℃. Add dysprosium oxide Dy with a purity of 99.5% during electrolysis 2 O 3 1.8 kg and 99.5% purity neodymium oxide Nd 2 O 3 3 kilograms, make 5.3 kilograms of NdDyFe alloys. Its main components, oxygen content and other impurities are shown in Table 1-1.

[0030]The alloy prepared in this example is added to the main component of NdFeB, and the sintered NdFeB magnet is prepared by smelting strip→hydrogen crushing and jet milling→magnetic field forming→vacuum sintering process, and the chemical composition and Magnet perform...

Embodiment 2

[0038] The R1R2M additive alloy in this embodiment is a PrDyFe alloy, and its alloy preparation method is: using a graphite crucible as a reactor and an iron rod as a cathode to obtain it by electrolysis. The electrolyte is praseodymium fluoride 78wt%, dysprosium fluoride 12wt%, lithium fluoride 10wt%, direct current electrolysis, average current intensity 2400A, cathode current density 8A / cm 2 , Electrolysis temperature maintained at 1000 ~ 1020 ℃. Add dysprosium oxide Dy with a purity of 99.5% during electrolysis 2 O 3 0.8 kg and 99.5% purity of praseodymium oxide Pr 6 O 11 3 kilograms, make 4 kilograms of PrDyFe alloys. Its main components, oxygen content and other impurities are shown in Table 2-1. This example was compared with the sintered NdFeB magnet prepared by the corresponding conventional method, including the standard deviation of the chemical composition and the performance of the magnet. The results are shown in Table 2-2 and 2-3 respectively.

[0039] Tab...

Embodiment 3

[0046] The R1R2M additive alloy in this embodiment is a PrNdDy alloy, which is prepared by electrolysis using a graphite crucible as a reactor and a tungsten rod as a cathode. The electrolyte is praseodymium neodymium fluoride 37wt%, dysprosium fluoride 53wt%, lithium fluoride 10wt%, direct current electrolysis, average current intensity 2400A, cathode current density 13A / cm 2 , Electrolysis temperature maintained at 1000 ~ 1020 ℃. Each furnace is electrolyzed for about 1 hour, and dysprosium oxide Dy with a purity of 99.5% is added during the electrolysis process 2 O 3 2 kg, 1.2 kg of praseodymium neodymium oxide with a purity of 99.5%, and 3 kg of PrNdDy alloy. Its main components, oxygen content and other impurities are shown in Table 3-1. This example was compared with the sintered NdFeB magnet prepared by the corresponding conventional method, including the standard deviation of the chemical composition and the magnet performance. The results are shown in Table 3-2 and...

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Abstract

The invention relates to a rare-earth additive alloy for producing magnetic material. The composition formula can be represent as R1R2M, the alloy includes 0.5wt%<=R1<=30wt%, 0wt%<=R2<=99.0wt% and residue M, the R1 represents at least one element selected from Tb and Dy, R2 represents at least one element selected from La, Ce, Pr, Nd, Y, Sc, Sm, Eu, Gd, Ho, Er, Tm, Yb and Lu, M represents one or more transition metal selected from Fe, Co, Cu, Zr, Ga, Al, Mn, Ni, Cr, Zn, Ge, Sem, Mo, V, Ti, In, Sn, Sb, Pb and Hf. Compared with rare-earth permanent-magnet material added with single metal, the rare-earth permanent-magnet material prepared with the additive alloy has advantages of low melting point, precise composition control, uniform elements dispersion and high magnet performance.

Description

technical field [0001] The invention relates to a rare earth addition alloy used to manufacture new functional materials, in particular to Nd-Fe-B series permanent magnet materials with excellent magnetic properties. Background technique [0002] Rare earths are widely used in the manufacture of various new functional materials due to their unique magnetic, optical, electrical and other superior properties, and are the basic raw materials for the preparation of rare earth functional materials. For example: NdFeB permanent magnet material occupies a very important position in the rare earth permanent magnet material. During the preparation process, rare earth metals such as Nd and Pr need to be added to obtain higher magnet coercive force and good temperature characteristics. In the preparation process of traditional NdFeB magnets, the above-mentioned single heavy rare earth metal is directly added. However, the preparation process of single rare earth metal is long, the met...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C30/00C22C33/06H01F1/053
Inventor 李红卫于敦波李扩社颜世宏赵春雷鱼志坚胡权霞
Owner GRIREM ADVANCED MATERIALS CO LTD
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