A kind of preparation method of thermally stable NdFeB magnet
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A NdFeB, thermally stable technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of poor thermal stability, reduced service life, and performance degradation of magnets, and achieve coercive force reduction, The effects of sufficient wrapping and reduced magnetic remanence
Active Publication Date: 2017-04-05
NINGBO ZHAOBAO MAGNET
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However, the thermal stability of the magnet is poor, and its performance will decrease with the increase of temperature, and the degaussing will be serious, which will significantly reduce its service life.
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Embodiment 1
[0021] A method for preparing a thermally stable NdFeB magnet, comprising the following steps:
[0022] (1) Equipped with NdFeB magnetic powder, which is composed of the following components by weight percentage: Nd 25%, Ho 4%, F 2.6%, Ni 1.8%, Co 0.12%, Al 0.1%, B 0.95%, and the balance is Fe; When there are accidental impurities in the raw materials, or when trace impurities are introduced in the preparation process, it will not affect the completion of the present invention; F is added in the form of metal fluoride required in the proportioning;
[0023] (2) Mix the silane coupling agent KH-560 of 2% by weight of the magnetic powder and 150% of acetone and add it into the magnetic powder, and then vibrate for 1.5 hours with a 50KHz ultrasonic wave;
[0024] (3) Add 1.8% accelerator (N,N-dimethylaniline) of magnetic powder weight, 150% acetone and 11.5% epoxy resin, then oscillate with 50KHz ultrasonic waves for 1.5 hours and dry until the solid content 80wt%;
[0025] (4)...
Embodiment 2
[0027] A preparation method of a thermally stable NdFeB magnet is the same as in Example 1 except for the following parts: Nd 27%, Ho3%, F 2.8%, Ni 0.1%, Co 0.95%, Al 0.1%, B 1.05%, The balance is Fe. The preparation method is the same as in Example 1.
Embodiment 3
[0029] A preparation method of a thermally stable NdFeB magnet is the same as in Example 1 except for the following parts: Nd 27%, Ho 5%, F 2.8%, Ni 2.0%, Co 0.95%, Al 0.35%, B 1.05%, The balance is Fe. The preparation method is the same as in Example 1.
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Abstract
The invention belongs to the field of magnetic materials, and particularly relates to a preparation method of a thermal-stability neodymium-iron-boron magnet. The method comprises the following steps of: preparing magnetic powder comprising the following ingredients in percentage by weight: 24 to 27 percent of Nd, 3 to 5 percent of Ho, 0.1 to 2.8 percent of F, 0.1 to 2.0 percent of Ni, 0.1 to 0.95 percent of Co, 0.1 to 0.35 percent of Al, 0.6 to 1.05 percent of B and the balance Fe; then adding coupling agents, acetone, accelerants and epoxy resin; performing 40-60KHz ultrasonic wave oscillation for uniform mixing and dispersion; next placing the mixture into a mold for slow pressing formation; meanwhile, carrying out microwave heating treatment; and finally magnetizing an obtained formed blank and obtaining the neodymium-iron-boron magnet. The obtained neodymium-iron-boron magnet has the advantages that on the premise of ensuring the magnetism, through the magnet resistance regulation, the thermal stability of the magnet is obviously improved; the service life is obviously prolonged; and meanwhile, the anti-corrosion performance of the magnet is also improved.
Description
technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a preparation method of a thermally stable NdFeB magnet. Background technique [0002] With the development of science and technology, magnetic materials are widely used in industrial production and residential life. Magnetic materials can realize the conversion of magnetic energy and electric energy, and then realize the automation and intelligence of electrical equipment. It can be said that magnetic materials are closely related to all aspects of informationization, automation, mechatronics, national defense, and national economy. However, while magnetic materials are widely used, higher requirements are placed on their performance. [0003] Since the emergence of rare earth permanent magnet materials, the performance of permanent magnet materials has made a qualitative leap. The raw material resources of NdFeB magnets are sufficient, and they are the best among ...
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