Neodymium iron boron magnetic powder as well as preparation method and application thereof

A neodymium-iron-boron and magnetic powder technology is applied in the manufacture of magnetic cores, inductors/transformers/magnets, electrical components, etc. Bonded NdFeB magnet application and other issues to achieve the effect of reducing mechanical damage, high coercivity, reducing amorphization and oxidation

Inactive Publication Date: 2020-09-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnetic properties of bonded NdFeB magnets are low. This shortcoming restricts the application of bonded NdFeB magnets and also affects the development of bonded NdFeB magnets.

Method used

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  • Neodymium iron boron magnetic powder as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0031] The preparation method of the NdFeB magnetic powder provided by the embodiment of the present invention includes:

[0032] Ball milling treatment: put the coarse NdFeB alloy powder in a ball mill, and perform ball milling with a material-to-ball ratio of 1:6-10, the ball milling speed is 100-200rpm, and the ball-milling time is 2-4h; the coarse NdFeB alloy powder When placed in the ball mill, an organic solvent is also added together, and the organic solvent includes oleic acid and n-heptane with a volume ratio of 1:5-20.

[0033] For NdFeB rare earth permanent magnets with fine grains, uniform distribution, and well-defined intergranular phases, during the ball milling process, there is not much fracture along the brittle intergranular phases, but more transgranular phases Fracture causes a large number of defects in the original matrix; for the original matrix with relatively coarse grains and a certain texture, it is easier to preferentially fracture at the brittle p...

Embodiment 1

[0053] (1) Rare earth neodymium, iron boron, cobalt gallium and pure iron with a purity of 99.9% are used as raw materials, and Nd 14 Fe 75.5 co 4.5 B 5.6 Ga 0.4 (atomic ratio) ingredients.

[0054] (2) Put the above-mentioned prepared raw materials into a high-vacuum single-roller quick-quenching furnace, and evacuate to 10 -3 Pa and below, heat and melt each raw material, and keep it warm for 1min to homogenize the alloy composition. The melt temperature can reach 1550°C. The alloy strip is prepared by using a water-cooled copper roll, and the tangential line speed of the copper roll is 40m / s.

[0055] (3) The alloy strip is subjected to heat treatment at a temperature of 550° C. for 10 minutes.

[0056] (4) After the alloy strip is coarsely crushed in the glove box, it is sieved through a 300-mesh sieve, and the coarse magnetic powder, zirconia balls with a diameter of 3mm and 20ml of organic solvent, wherein the volume ratio of oleic acid and n-heptane is 1:5, are uni...

Embodiment 2-4

[0059] Embodiment 2-4 is basically the same as embodiment 1, and the difference is only that some ball milling parameters are different:

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Abstract

The invention relates to the technical field of permanent magnet materials, and discloses neodymium iron boron magnetic powder and a preparation method and application thereof. The preparation methodof the neodymium iron boron magnetic powder comprises the steps: ball milling treatment, specifically, placing coarse neodymium-iron-boron alloy powder in a ball mill, carrying out ball milling according to the material-ball ratio of 1: 6-10 at the ball milling rotating speed of 100-200 rpm for 2-4 h; and putting the crude neodymium-iron-boron alloy powder into a ball mill, and simultaneously adding an organic solvent capable of submerging the material balls, wherein the organic solvent comprises oleic acid and n-heptane in a volume ratio of 1: (5-20). According to the preparation method, thespecific organic solvent is added in a low-energy ball milling mode, so that damage to the magnetic powder in the ball milling process is reduced, and high coercive force can be kept while the magnetic powder is refined. The neodymium iron boron magnetic powder is prepared through the method and is suitable for being applied to automobile parts and electronic or electrical equipment.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to neodymium-iron-boron magnetic powder and its preparation method and application. Background technique [0002] Bonded NdFeB magnet has a series of outstanding advantages: it has various shapes, does not deform, and does not require secondary processing; it has a large degree of freedom in shape, and can produce various products that meet the requirements according to the needs of use; it is convenient for mass-automated production; High mechanical strength, etc. Therefore, bonded NdFeB magnet products are often used in some precision and miniaturized fields, such as auto parts, electronics, and electrical equipment. However, the low magnetic performance of bonded NdFeB magnets restricts the application of bonded NdFeB magnets and also affects the development of bonded NdFeB magnets. Under the same volume, a magnet with excellent magnetic properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/0206H01F41/0253H01F41/0293
Inventor 余红雅邹飞周庆刘仲武肖方明
Owner SOUTH CHINA UNIV OF TECH
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