Preparation method for neodymium-iron-boron magnet powder
A technology of neodymium iron boron and magnets, which is applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of reduced magnetic properties of magnets, easy oxidation, etc., to achieve increased remanence, increased orientation, high heat The effect of stability
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[0031] Example 1
[0032] Validated with 50H sintered NdFeB material, the raw material composition is shown in Table 1 below:
[0033] element PrNd DyAlBCu CoZr Ga Fe wt%2910.10.90.151.50.170.266.98
[0034] First, according to the above formula, prepare 600Kg of raw materials, in which iron rods are derusted, the rare earth materials are treated with oil-free, moisture-free and rust-free treatment, and the prepared raw materials are melted under the condition of medium frequency induction heating by vacuum melting (SC) , And finally obtain a sheet-shaped fast-quenched NdFeB alloy with columnar crystal structure.
[0035] Then the hydrogen is absorbed in a hydrogen crusher and crushed into millimeter-sized coarse particles. The medium crusher further crushes the particles, and then uses high-pressure nitrogen gas to grind uniform micron-sized powders with an average particle size of 4.0-4.5μm.
[0036] Then, the jet mill powder is dehydrogenated and mechanically mixed through a de...
Example Embodiment
[0056] Example 2
[0057] Validated with 42UH sintered NdFeB material, the raw material composition is shown in Table 6 below:
[0058] element PrNd DyAlBCu CoZr Ga Fe wt%2740.10.90.151.50.170.2565.93
[0059] First, according to the above formula, prepare 600Kg of raw materials, in which iron rods are derusted, the rare earth materials are treated with oil-free, moisture-free and rust-free treatment, and the prepared raw materials are melted under the condition of medium frequency induction heating by vacuum melting (SC) , And finally obtain a sheet-shaped fast-quenched NdFeB alloy with columnar crystal structure.
[0060] Then, hydrogen is absorbed in a hydrogen crusher and crushed into millimeter-sized coarse particles. The medium crusher further crushes the particles, and then uses high-pressure nitrogen gas to grind uniformly micron-sized powder with an average particle size of 3.5-4.0μm.
[0061] Then, the jet mill powder is dehydrogenated and mechanically mixed through a de...
Example Embodiment
[0081] Example 3
[0082] The verification with 50SH sintered NdFeB material, the raw material composition is shown in Table 11 below:
[0083] element PrNd TbAlBCu CoZr Ga Fe wt%2820.10.910.1210.170.267.5
[0084] First, according to the above formula, prepare 600Kg of raw materials, in which iron rods are derusted, the rare earth materials are treated with oil-free, moisture-free and rust-free treatment, and the prepared raw materials are melted under the condition of medium frequency induction heating by vacuum melting (SC) , And finally obtain a sheet-shaped fast-quenched NdFeB alloy with columnar crystal structure.
[0085] Then, hydrogen is absorbed in a hydrogen crusher and crushed into millimeter-sized coarse particles. The medium crusher further crushes the particles, and then grinds uniform micron-sized powder with high-pressure nitrogen through a jet mill. The average particle size of the powder is 3.5-3.8 μm.
[0086] Then, the jet mill powder is dehydrogenated and mec...
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