Preparation method of sintering neodymium iron boron sheet magnet
A technology of NdFeB and flakes, which is applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of insufficient improvement ability, smaller grain size, and limited effect, so as to avoid fine grain size Minimize, reduce hard magnetic coupling, reduce the effect of direct contact
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[0027] Embodiment 1: A method for preparing a sintered NdFeB sheet magnet includes the following steps:
[0028] ① Configure the raw materials for sintered NdFeB sheet magnets according to the design requirements. The raw materials are smelted in a vacuum electromagnetic induction furnace and poured into quick-setting flakes with a thickness of 0.2~0.6mm at a temperature of 1450℃, and then the speed is measured in a hydrogen crushing furnace. The condensate is subjected to hydrogen crushing treatment to obtain coarse powder with a particle size of 0.1-3mm, and then the coarse powder is accelerated by 0.4-0.6Mpa high-pressure gas in a jet milling equipment to make it collide with each other to form an average particle size of specific surface area It is 2.0~4.0μm powder;
[0029] ②Put the powder into the mold cavity of the forming press, and press the powder into a shape under the action of an orientation magnetic field to obtain a sintered neodymium iron boron green body;
[0030] ③...
Example Embodiment
[0039] Embodiment 2: A method for preparing a sintered NdFeB thin piece magnet, including the following steps:
[0040] ① Configure the raw materials for sintered NdFeB sheet magnets according to the design requirements. The raw materials are smelted in a vacuum electromagnetic induction furnace and poured into quick-setting flakes with a thickness of 0.2~0.6mm at a temperature of 1450℃, and then the speed is measured in a hydrogen crushing furnace. The condensate is subjected to hydrogen crushing treatment to obtain coarse powder with a particle size of 0.1-3mm, and then the coarse powder is accelerated by 0.4-0.6Mpa high-pressure gas in a jet milling equipment to make it collide with each other to form an average particle size of specific surface area It is 2.0~4.0μm powder;
[0041] ②Put the powder into the mold cavity of the forming press, and press the powder into a shape under the action of an orientation magnetic field to obtain a sintered neodymium iron boron green body;
[...
Example Embodiment
[0051] Embodiment 3: A method for preparing a sintered NdFeB thin piece magnet, including the following steps:
[0052] ① Configure the raw materials for sintered NdFeB sheet magnets according to the design requirements. The raw materials are smelted in a vacuum electromagnetic induction furnace and poured into quick-setting flakes with a thickness of 0.2~0.6mm at a temperature of 1450℃, and then the speed is measured in a hydrogen crushing furnace. The condensate is subjected to hydrogen crushing treatment to obtain coarse powder with a particle size of 0.1-3mm, and then the coarse powder is accelerated by 0.4-0.6Mpa high-pressure gas in a jet milling equipment to make it collide with each other to form an average particle size of specific surface area It is 2.0~4.0μm powder;
[0053] ②Put the powder into the mold cavity of the forming press, and press the powder into a shape under the action of an orientation magnetic field to obtain a sintered neodymium iron boron green body;
[...
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