Sintered neodymium-iron-boron magnet without heavy rare earth and preparation method of sintered neodymium-iron-boron magnet

A non-weight rare earth and NdFeB technology is applied in the fields of magnetic objects, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc. It can solve the problems of not giving full play to the performance advantages and achieve the effect of improving the magnetic performance of the product

Inactive Publication Date: 2016-01-06
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] For example, in the patent publication number 103824668A, it is mentioned that rare earth micropowder can improve the magnetic properties, and in the pa

Method used

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  • Sintered neodymium-iron-boron magnet without heavy rare earth and preparation method of sintered neodymium-iron-boron magnet

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preparation example Construction

[0038] A preparation method of a heavy rare earth-free sintered NdFeB magnet, comprising the following steps:

[0039] (1) The NdFeB rare earth permanent magnet material alloy is crushed by mechanical crushing or hydrogen crushing and jet milling to obtain NdFeB rare earth permanent magnet material alloy powder with an average particle size of 2.0-4.5 μm;

[0040] (2) Light rare earth element fine powder is obtained through various crushing processes to obtain light rare earth fine powder with an average particle size of 1-2.5 μm;

[0041] (3) adding the rare earth micropowder and nanometer metal into the NdFeB permanent magnet material alloy powder according to the weight ratio of 0.5%-3% and 0.05%-2% respectively, and mixing evenly;

[0042] (4) Pressing the mixed alloy powder into a blank in an orientation magnetic field with a magnetic field strength ≥ 1.4T;

[0043] (5) Put the formed blank into a vacuum sintering furnace for high-temperature sintering, the sintering tem...

Embodiment 1

[0045] The composition is (Nd, Pr) 13.94 Fe 78.28 m 1.86 B 5.92 (at%) NdFeB permanent magnet material alloy, prepare according to the technical scheme of the present invention: carry out batching by above-mentioned composition and make NdFeB permanent magnet material alloy with quick-setting sheet technology; The rare earth NdFeB permanent magnet material alloy is crushed to obtain alloy powder with an average particle size of 3.1 μm.

[0046] Under the protection of nitrogen, the nano-titanium with an average particle size of 40nm and the prepared NdFeB permanent magnet material alloy are fully mixed, and the mixed powder is pressed into a 71.4×50×44.1 (mm) in an orientation magnetic field of ≥1.4T ) square blank, put the blank into a high vacuum sintering furnace, sinter at 1065°C for 4.5 hours, temper at 895°C for 2 hours and temper at 515°C for 4 hours to obtain a sintered magnet: take Φ10×10 (mm) Table sample 2 is only tested for magnetic properties.

Embodiment 1

[0047]Example 1: The addition percentage of nano-titanium is 0%, the magnetic performance test result of the gained sintered magnet: Br=(13.98-14.05) KGs, HcJ=(15.07-15.13) KOe, (BH)m=(46.81- 47.07) MGsOe.

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Abstract

The invention discloses a sintered neodymium-iron-boron magnet without heavy rare earth and a preparation method of the sintered neodymium-iron-boron magnet. The constituent of sintered neodymium-iron-boron magnet is Re<Alpha>Fe<100-Alpha-Beta-Gamma>B<Beta>M<Gamma>, wherein Re is a light rare earth element and comprises an element selected from one or more than one of La, Ce, Pr, Nd, Sm and Eu; M is an addition element and comprises an element selected from one or more than one of Ti, V, Cr, Ni, Zn, Ga, Ge, Al, Zr, Nb, Co, Cu, Ag, Sn, W, Mo, Pb, Bi, Mg and Pd; Fe comprises Fe and an inevitable impurity; Alpha, Beta and Gamma are respectively atomic percentage of each element; and Alpha is more than or equal to 12 and less than or equal to 17, Beta is more than 5 and less than or equal to 6.5, and Gamma is more than or equal to 0.1 and less than or equal to 5. The sintered neodymium-iron-boron magnet has the advantages that low-melted light rare earth micro-powder is used for achieving a grain refinement effect on liquid-state coated nano metal powder moved and uniformly distributed in a grain boundary during high-temperature sintering, and moreover, the light rare earth micro-powder can simultaneously play in improving magnetic performance of a product.

Description

technical field [0001] The invention relates to the related technical field of rare earth NdFeB permanent magnet materials, in particular to a heavy rare earth-free sintered NdFeB magnet and a preparation method thereof. Background technique [0002] Sintered NdFeB magnet is the permanent magnet material with the strongest comprehensive magnetic properties in the world today. With its excellent characteristics and cost performance surpassing traditional permanent magnet materials, it is widely used in energy, transportation, machinery, medical, computer, home appliances and other fields , play an important role in the national economy. Among the technical indicators of magnetic materials, the magnetic energy product is the most important. The magnetic energy product represents the energy of an external magnetic field generated by a magnet per unit volume. The high magnetic energy product means that smaller magnets can be used on the motor to output more power. NdFeB is an...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/16
Inventor 黎龙贵吴美浩胡烈平段敏
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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