Preparation process of neodymium-iron-boron magnet

A preparation process, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve problems such as poor reliability of product surface coatings, improve performance and use methods, and achieve the effect of wide application
CN112071616AActive Publication Date: 2020-12-11宁波四环磁业有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
宁波四环磁业有限公司
Publication Date
2020-12-11

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Abstract

The invention discloses a preparation process of a neodymium-iron-boron magnet. The preparation process comprises the following steps: a, smelting: weighing raw materials in proportion, putting neodymium-iron-boron powder, Fe3O4, calcium carbonate powder, sodium benzoate, stearic acid and iron into a smelting furnace, carrying out heating to 1,500 DEG C and 1,600 DEG C, sequentially adding carbonblack, calcium propionate, SiO2 and single crystal magnesium oxide, continuing heating until all the raw materials are molten into a liquid state, adjusting a temperature to 2,750 DEG C and 2,860 DEGC, and keeping the temperature for 3-5 hours to obtain a crude permanent magnet product solution; b, powder preparation: cooling and curing the crude permanent magnet product solution to obtain a solid crude permanent magnet product, and feeding the solid crude permanent magnet product into a tube mill for continuous grinding for 3-5 hours to obtain permanent magnet powder with a particle size of0.5-1 [mu]m; c, pressing: placing the obtained permanent magnet powder in a magnetic field with a magnetic field intensity of 20,000-25,000 Gs for orientation and shaping under the action of argon shielding gas, and then carrying out pressing under a static pressure of 400 MPa to obtain a blank; d, cutting: cutting an inclined surface on the blank, and polishing the inclined surface; and e, tempering: placing the blank in a vacuum environment with a temperature of 800 DEG C to 900 DEG C for primary tempering to obtain the permanent magnet.
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Description

technical field

[0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a preparation process of an NdFeB magnet. Background technique

[0002] As the third generation of rare earth permanent magnet materials, NdFeB rare earth permanent magnet materials have been commercialized and developed by Japan's Sumitomo Metal and American GM Corporation in 1983. Due to the characteristics of high remanence, high coercive force and high magnetic energy product , are widely used in power electronics, communications, information, motors, transportation, office automation, medical equipment, military and other fields, and make the application of some small, highly integrated high-tech products possible. To meet the above market needs, we need NdFeB magnets with both high remanence and high coercivity are prepared at a lower cost. NdFeB magnets are called "magnet kings". They have the highest remanence and magnetic energy product among all ...

Claims

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