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Sintered NdFeB rear-earth permanent magnet with fine magnetization characteristic and manufacturing method thereof

A technology of rare earth permanent magnets and magnetization characteristics, applied in the field of sintered NdFeB rare earth permanent magnets, manufacturing the sintered NdFeB rare earth permanent magnets, can solve the problems of uneven composition and structure, achieve uniform internal structure, and expand application Scope, the effect of realizing large-scale industrial production

Active Publication Date: 2010-10-27
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The composition and structure of some complex-phase and multi-domain permanent magnet materials are not uniform, and it is easy to form domain wall pinning centers in positions such as second phases or crystal defects such as grain boundaries and vacancies.

Method used

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  • Sintered NdFeB rear-earth permanent magnet with fine magnetization characteristic and manufacturing method thereof
  • Sintered NdFeB rear-earth permanent magnet with fine magnetization characteristic and manufacturing method thereof
  • Sintered NdFeB rear-earth permanent magnet with fine magnetization characteristic and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0042] Melting Ingot Alloy R 1 FeMB, the ingot alloy was coarsely crushed by the conventional method, and after hydrogen crushing, it was mixed with R 2 Oxide powder (Yb 2 o 3 , Tb 2 o 3 、Dy 2 o 3 ) mixed, jet milled into fine magnetic powder, and then mixed evenly, the final composition is obtained (Nd, Pr) a (Yb, Dy, Tb) b Fe 100-a-b-c-d (Cr, Co, Cu, Al, Nb) c B d (a, b, c, d are atomic percentages) of fine magnetic powder, wherein a, b, c, d take 1) a=8.5, b=5, c=0, d=5; 2) a=10, b=2.5, c=1.5, d=5.5; 3) a=15, b=1, c=3, d=6; 4) a=15, b=0, c=3, d=6. Put the 4 kinds of magnetic powder into the pulsed magnetic field magnetizer with the maximum magnetic field up to 7T for pre-orientation, then oriented by 2T magnetic field and press-molded, after 180MPa isostatic pressing, the green body is sintered at 1000-1100℃ for 3-4h, 500-600 Tempering at ℃ for 3 to 5 hours to obtain 4 kinds of rough magnets, and then cut into cylindrical magnets of Φ10mm×2mm. The magnetization...

Embodiment 5～11

[0046] Melting Ingot Alloy R 1 FeMB, the ingot alloy was coarsely crushed by the conventional method, and after hydrogen crushing, it was mixed with R 2 Oxide (Yb 2 o 3 , Tb 2 o 3 、Dy 2 o 3 ) powders are mixed, made into fine magnetic powder by jet milling, and then mixed evenly, and the final composition is (Nd, Re) a (Yb, Dy, Tb) b Ee 100-a-b-c-d (Cr, Co, Cu, Al, Nb) c B d (a, b, c, d are atomic percentages) fine magnetic powder, wherein Re is selected from one of Sc, Y, La, Ce, Pm, Sm, Eu, a, b, c, d take a=11.5, b=3, c=1.5, d=5.5. Put the magnetic powder into a pulsed magnetic field magnetizer with a maximum magnetic field of 7T for pre-orientation, and then oriented by a 2T magnetic field and pressed into shape. After isostatic pressing at 180MPa, the green body is sintered at 1070°C for 3h and tempered at 550°C for 4h to obtain a rough magnet. After that, it is cut into a cylindrical magnet of Φ10mm×2mm. Test the magnetization curve of the magnet, record eac...

Embodiment 12～18

[0048] Melting Ingot Alloy R 1 FeMB, the ingot alloy was coarsely crushed by the conventional method, and after hydrogen crushing, it was mixed with R 2 Oxide (Yb 2 o 3 , Tb 2 o 3 、Dy 2 o 3 ) powder mixed, made into fine magnetic powder by jet mill, and then mixed evenly, the final composition is (Nd, Pr.Re) a (Yb, Dy, Tb) b Fe 100-a-b-c-d (Cr, Co, Cu, Al, Nb) c B d (a, b, c, d are atomic percentages) fine magnetic powder, wherein Re is selected from one of Sc, Y, La, Ce, Pm, Sm, Eu, a, b, c, d take a=11.5, b=3, c=1.5, d=5.5. Put the magnetic powder into a pulsed magnetic field magnetizer with a maximum magnetic field of 7T for pre-orientation, and then oriented by a 2T magnetic field and press-molded. After 180MPa isostatic pressing, the green body is sintered at 1060°C for 4h, and tempered at 500°C for 3.5h to obtain a rough magnet. , and then cut into Φ10mm×2mm cylindrical magnets. Test the magnetization curve of the magnet, record each process parameter and th...

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Abstract

The invention relates to a sintered Nd-Fe-B rear-earth permanent magnet with fine magnetization characteristic, comprising the following components: (R1a, R2b) Fe100-a-b-c-d McBd, wherein R1 is Nd, or comprising Nd and at least one element of rear-earth elements selected from Sc, Y, La, Ce, Pr, Pm, Sm and Eu; R2 comprises Yb and at least one element of rear-earth elements selected from Tb, Dy, Gd, Ho, ErTm and Lu; and M comprises Cr and at least one element of rear-earth elements selected from Co, Cu, Al, Cr, Ga, Nb, Ti, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Ni, Mo, W and Ta. In the invention, the sintered Nd-Fe-B easy to charge magnetism to be saturated is manufactured when the magnetic circuit is at open state, and the method is low in cost, simple, and easy to realize large-scale industrial production.

Description

technical field [0001] The invention relates to a sintered NdFeB rare earth permanent magnet alloy, more specifically, a sintered NdFeB rare earth permanent magnet with excellent magnetization properties, and a method for manufacturing the sintered NdFeB rare earth permanent magnet. Background technique [0002] Sintered NdFeB is widely used, and is currently being used more and more in high-end industries such as motors. In the field of high-end motors, in order to facilitate assembly, the method of putting unmagnetized magnets into the magnetic circuit and then remagnetizing is generally used (see "Magnetic Materials and Devices", Volume 3, Issue 6, Page 43, published in December 1999 Liu Yapi and Xing Huaizhong's paper "Discussion on Some Issues of Saturation Magnetization of Rare Earth Permanent Magnet Magnet System"), in order to obtain the magnetic field required by the motor. However, the magnetic field that the user's magnetizing device can provide is limited by the...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/14
Inventor 李正钮萼朱小矿王惠新韦立立姚宇良饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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