A kind of preparation method of sintered NdFeB sheet magnet
A neodymium-iron-boron and sheet technology, which is applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of insufficient improvement ability, reduced magnetic flux of sintered neodymium-iron-boron sheet magnets, limited effect, etc., to avoid The effect of grain size refinement, improvement of low magnetic phenomenon, reduction of direct contact
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Embodiment 1
[0027] Embodiment 1: A kind of preparation method of sintered NdFeB sheet magnet, comprises the following steps:
[0028]① Configure the raw materials of sintered NdFeB sheet magnets according to the design requirements, melt the raw materials in a vacuum electromagnetic induction furnace, cast them into quick-setting sheets with a thickness of 0.2-0.6mm at a temperature of 1450°C, and then speed them up in a hydrogen crushing furnace The condensed sheet is subjected to hydrogen crushing treatment to obtain a coarse powder with a particle size of 0.1-3mm, and then the coarse powder is accelerated by a high-pressure gas of 0.4-0.6Mpa in the airflow milling equipment to make it collide with each other to form a specific surface area and an average particle size 2.0 ~ 4.0μm powder;
[0029] ②Put the powder into the mold cavity of the forming press, and press the powder under the action of the orientation magnetic field to obtain a sintered NdFeB green body;
[0030] ③ Sintering ...
Embodiment 2
[0039] Embodiment two: a kind of preparation method of sintered NdFeB sheet magnet, comprises the following steps:
[0040] ① Configure the raw materials of sintered NdFeB sheet magnets according to the design requirements, melt the raw materials in a vacuum electromagnetic induction furnace, cast them into quick-setting sheets with a thickness of 0.2-0.6mm at a temperature of 1450°C, and then speed them up in a hydrogen crushing furnace The condensed sheet is subjected to hydrogen crushing treatment to obtain a coarse powder with a particle size of 0.1-3mm, and then the coarse powder is accelerated by a high-pressure gas of 0.4-0.6Mpa in the airflow milling equipment to make it collide with each other to form a specific surface area and an average particle size 2.0 ~ 4.0μm powder;
[0041] ②Put the powder into the mold cavity of the forming press, and press the powder under the action of the orientation magnetic field to obtain a sintered NdFeB green body;
[0042] ③ Sinteri...
Embodiment 3
[0051] Embodiment three: a kind of preparation method of sintered NdFeB sheet magnet, comprises the following steps:
[0052] ① Configure the raw materials of sintered NdFeB sheet magnets according to the design requirements, melt the raw materials in a vacuum electromagnetic induction furnace, cast them into quick-setting sheets with a thickness of 0.2-0.6mm at a temperature of 1450°C, and then speed them up in a hydrogen crushing furnace The condensed sheet is subjected to hydrogen crushing treatment to obtain a coarse powder with a particle size of 0.1-3mm, and then the coarse powder is accelerated by a high-pressure gas of 0.4-0.6Mpa in the airflow milling equipment to make it collide with each other to form a specific surface area and an average particle size 2.0 ~ 4.0μm powder;
[0053] ②Put the powder into the mold cavity of the forming press, and press the powder under the action of the orientation magnetic field to obtain a sintered NdFeB green body;
[0054] ③ Sinte...
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