High-coercivity neodymium-cerium-iron-boron permanent magnet and preparation method and application thereof
A permanent magnet, neodymium-cerium-iron technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of reduced residual magnetic induction intensity of magnets, lack of RE-rich phase in main phase grains, and difficulty in obtaining high-correction magnets. Tenacity, etc.
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Embodiment 1
[0086] (1) According to the design ratio of 100% by mass: PrNd: 29wt.%, Ce: 3.7wt.%, Dy: 0.4wt.%, Co: 1.2wt.%, Cu: 0.3wt.%, Ga: 0.1wt. .%, Al: 0.53wt.%, Zr: 0.12wt.%, Ti: 0.12wt.%, B: 0.99wt.%, Fe balance, weigh raw materials, adopt vacuum induction melting furnace under the protection of Ar gas atmosphere Smelting is carried out, and the molten liquid is cast onto a quenching roll with a rotational speed of 32rpm, and the liquid casting temperature is 1400°C to obtain alloy flakes with an average thickness of 0.25mm;
[0087] (2) The alloy flakes are made into alloy powder with an average particle size of 3.7 μm by hydrogen crushing, dehydrogenation, and jet milling, and 2 Under the protection of the atmosphere, add the lubricant zinc stearate with a weight ratio of 0.05wt% of the alloy powder, and stir and mix evenly;
[0088] (3) in N 2 Under the protection of the atmosphere, the mixed powder in step (2) was filled into the mold cavity of the molding equipment mold, the o...
Embodiment 2
[0094] Example 2 adopts the same recipe, smelting, powder making, molding, and aging process as in Example 1, the only difference is that a 5-stage sintering and heat preservation process is used, and the specific sintering process is shown in Table 1.
Embodiment 3
[0111] Embodiment 3 selects the magnet after sintering and aging in Embodiment 1, and processes it into a sheet product with a length of 20 mm, a width of 20 mm, and a thickness of 5 mm. Using a dipping process, a layer of dysprosium fluoride film with a thickness of 1 mm is applied on the surface of the magnet, and then the Diffusion treatment was carried out at 900°C for 15 hours. After the diffusion temperature was cooled below 100°C, the temperature was raised to 550°C for 5 hours of aging treatment to prepare a grain boundary diffused NdCereB permanent magnet. The final magnets are subjected to magnetic performance testing.
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