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Rare-earth permanent magnet material and preparation method thereof

A technology of rare earth permanent magnets and rare earth elements, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., and can solve the problems of low maximum working temperature and low coercive force of rare earth permanent magnet materials

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

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of low coercive force and low maximum working temperature of rare earth permanent magnet materials existing in the prior art, and to provide a rare earth magnet with high coercive force and high maximum working temperature at the same time. Permanent magnet material

Method used

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  • Rare-earth permanent magnet material and preparation method thereof

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preparation example Construction

[0024] The concrete steps of the preparation method of the rare earth permanent magnet material provided by the invention are as follows:

[0025] The components of the rare earth permanent magnet material are weighed, mixed, melted, and then cast into ingots of rare earth permanent magnet materials by casting technology, or solidified thin slices of rare earth permanent magnet materials are made by quick-setting sheet technology, wherein the rare earth permanent magnet The composition of the material is: R a-x-y Ho x Dy y Fe 1-a-b-c-d co d m c B b , where x, y, a, b, c, d are the weight percentages of each element, 28%≤a≤34%, 0.95%≤b≤1.3%, 0≤c≤1.5%, 1%≤d≤10% , 15%≤x≤20%, 3%≤y≤8%, R is a rare earth element, R is selected from one or more of Nd, Pr, La, Ce, Gd, Tb, M is selected from Al, Cu , Ti, V, Cr, Zr, Hf, Mn, Nb, Sn, Mo, Ga, Si in one or more elements.

[0026] In preferred cases, 30%≤a≤33%, 0.97%≤b≤1.2%, 0.1%≤c≤1.3%. 1.5%≤d≤9%, 17%≤x≤19%, 4.1%≤y≤7.7%, R is one...

Embodiment 1

[0040] This embodiment is used to illustrate the rare earth permanent magnet material provided by the present invention and its preparation method.

[0041] 1) Based on the total weight of rare earth permanent magnet materials, weigh Pr0.46%, Nd2.02%, Dy2.8%, Tb0.2%, Ho17.91%, B1%, Fe73.11%, Co1.65 %, Al0.2%, Cu0.15%, Zr0.15%, and Ga0.1% are put into the model VI-200SC belt throwing furnace produced by Aifake Zhongbei Company to make quick-setting thin slices of rare earth permanent magnet materials , wherein, the surface linear velocity of the copper roller in the strip furnace is 1.5 m / s, and the thickness of the quick-setting sheet of rare earth permanent magnet material is 0.3 mm;

[0042] 2) The quick-setting flakes prepared in step 1 are crushed by a hydrogen crushing furnace, and then the rare earth permanent magnet material powder with an average particle diameter of 3.5 microns is made through jet milling, and the polyepoxide that accounts for 3% of the rare earth per...

Embodiment 2

[0052] This embodiment is used to illustrate the rare earth permanent magnet material provided by the present invention and its preparation method.

[0053] 1) Based on the total weight of rare earth magnetic materials, weigh Pr5.2%, Nd3.8%, Dy8%, Ho17%, B1%, Fe63.5%, Co1.5%, and put them into the In the VI-200SC belt throwing furnace, the quick-setting sheet of rare earth permanent magnet material is produced, wherein the surface speed of the copper roller in the belt throwing furnace is 1.2 m / s, and the thickness of the quick-setting sheet is 0.38 mm;

[0054] 2) The quick-setting flakes prepared in step 1 are crushed by hydrogen in a hydrogen crushing furnace, absorbed hydrogen at room temperature until saturated, dehydrogenated at 550°C, and made into hydrogen crushed powder after 6 hours, and then made by jet milling The average particle diameter is the powder of 3.8 microns, the antioxidant polyethylene oxide monofatty ester is added in the rare earth permanent magnet ma...

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Abstract

The invention discloses a rare-earth permanent magnet material and a preparation method thereof. The rare-earth permanent magnet material comprises the following components: R(a-x-y)Ho(x)Dy(y)Fe(1-a-b-c-d)Co(d)M(c)B(b), wherein x, y, a, b, c and d are weight percentage of all elements, a is more than or equal to 28% and less than or equal to 34%, b is more than or equal to 0.95% and less than or equal to 1.3%, c is more than or equal to 0% and less than or equal to 1.5%, d is more than or equal to 1% and less than or equal to 10%, x is more than or equal to 15% and less than or equal to 20% and y is more than or equal to 3% and less than or equal to 8%; R is a rare earth element and is selected from one or more of Nd, Pr, La, Ce, Gd and Tb; and M is selected from one or more elements of Al, Cu, Ti, V, Cr, Zr, Hf, Mn, Nb, Sn, Mo, Ga and Si. A casting technique is adopted to prepare a rare-earth permanent magnet material casting ingot, or a fast setting sheet technique is adopted to prepare a fast setting sheet, and the rare-earth permanent magnet material provided by the invention is prepared by procedures of grinding, molding, sintering and the like. By the rare-earth permanent magnet material provided by the invention, the coercive force is improved, the flux irreversible loss of the permanent magnet at the high temperature of 200 DEG C is less than or equal to 5%, and the permanent magnet can work normally at the temperature of 240 DEG C.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material and a preparation method thereof. Background technique [0002] In 1983, Japan's Sumitomo Metal Corporation invented the rare earth permanent magnet permanent magnet material for the first time. Since its inception, rare earth permanent magnet materials have been widely used in many fields such as automobiles, computers, electronics, machinery, energy, and medical equipment due to their advantages such as high magnetic energy product, high coercivity, relatively low price, and sufficient resource reserves . In particular, rare earth permanent magnets have a high performance-to-price ratio, so they become ideal materials for manufacturing magnetic functional devices with high efficiency, small size, and light weight, and have a revolutionary impact on many application fields. However, one of the disadvantages of sintered rare earth permanent magnets is low coercive force; in addition, in ...

Claims

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Application Information

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IPC IPC(8): H01F1/053B22F3/12B22F9/04
CPCC22C38/14C22C38/06B22F2998/10H01F1/0576B22F2999/00H01F41/0273H01F41/0266C22C38/005C22C38/12C22C38/10C22C38/16H01F1/0577B22F9/04B22F2009/044B22F9/023
Inventor 宫清邓小霞杜鑫
Owner BYD CO LTD
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