High-resistivity neodymium-iron-boron permanent magnet alloy and preparation method thereof
A permanent magnet alloy, high resistivity technology, applied in permanent magnet manufacturing, inductor/transformer/magnet manufacturing, circuits, etc., can solve the limitation of magnet resistivity improvement, and the key technical problems of NdFeB composite magnet preparation are not well solved. , the problem of low maximum magnetic energy product
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Embodiment 1
[0026] The permanent magnet is prepared by the preparation method of the present invention. First, 10ml of 7wt% polyvinyl alcohol aqueous solution is prepared at 90°C, 0.2g of aluminum nitride is added to the solution, and the insulating binder is obtained by stirring evenly. The nanocrystalline NdFeB fast Add 20g of the quenching powder into the insulating binder, stir evenly, and vacuum-dry to obtain NdFeB pellets coated with insulating binder on the surface, put them into a hot-pressing mold, and carry out vacuum degreasing in a vacuum hot-pressing furnace. At 250°C, 350°C, 400°C, and 500°C for 60 minutes respectively in multi-stage heat preservation, keep a vacuum higher than 10Pa, heat press at 550°C, hold for 1 minute, and then heat deform at a temperature of 830-850°C.
[0027] Under the above-mentioned preparation process conditions, the resistivity of the prepared high-resistivity permanent magnet alloy is 2.4mΩcm, and the magnetic energy product is 48MGsOe.
Embodiment 2
[0029] The permanent magnet is prepared by the preparation method of the present invention. First, 10ml of 7wt% polyvinyl alcohol aqueous solution is prepared at 90°C, 0.4g of zirconium nitride is added to the solution, and the insulating binder is obtained by stirring evenly. The nanocrystalline NdFeB fast Add 20g of the quenching powder into the insulating binder, stir evenly, and vacuum-dry to obtain NdFeB pellets coated with insulating binder on the surface, put them into a hot-pressing mold, and carry out vacuum degreasing in a vacuum hot-pressing furnace. At 250°C, 350°C, 400°C, and 500°C for 60 minutes, keep a vacuum higher than 10 Pa, heat press at 550°C, hold for 1 minute, and then heat deform at a temperature of 850°C.
[0030] Under the above-mentioned preparation process conditions, the resistivity of the prepared high-resistivity permanent magnet alloy is 2.6mΩcm, and the magnetic energy product is 47.3MGsOe.
Embodiment 3
[0032] The permanent magnet is prepared by the preparation method of the present invention. First, prepare 10ml of 7wt% polyvinyl alcohol aqueous solution at 90°C, add 1g of aluminum nitride into the solution, stir evenly to obtain an insulating binder, and quickly quench the nanocrystalline NdFeB Add 20g of the powder into the insulating binder, stir evenly, and vacuum-dry to obtain NdFeB pellets coated with insulating binder on the surface, put them into a hot-pressing mold, and carry out vacuum degreasing in a vacuum hot-pressing furnace. 250°C, 350°C, 400°C, and 500°C for 60 minutes in multiple stages of heat preservation, keeping a vacuum higher than 10Pa, hot pressing at 550°C, holding time for 1min, and then heat deformation, the temperature is 850°C.
[0033] Under the above-mentioned preparation process conditions, the resistivity of the prepared high-resistivity permanent magnet alloy is 3.8mΩcm, and the magnetic energy product is 46MGsOe.
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