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Problems solved by technology
Method used
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Problems solved by technology
The description of the method is not detailed enough, and the operability is not strong, for example, the fluoride of heavy rare earth elements and the particle size of calcium particles are not mentioned, which have a significant impact on the implementation results.
And the reduced heavy rare earth elements are still diffused by steam method, which has the disadvantages similar to CN101331566A
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0093] S1) Magnet manufacturing process:
[0094] S1-1) Smelting process: In atomic percentage, 12.5% of Nd, 1.5% of Dy, 0.5% of Al, 0.5% of Co, 0.05% of Cu, 0.2% of Nb, 5.9% of B and the balance Fe preparation raw materials; in the environment of argon protection, medium-frequency induction heating is used to melt in a vacuum melting furnace, and then cast on a rotating quenched copper roller at 1480 ° C to obtain an alloy sheet with an average thickness of 0.3 mm.
[0095] S1-2) Milling process:
[0096] S1-2-1) Coarse crushing process: the alloy flakes are hydrogenated and crushed under 0.1MPa hydrogen, and then vacuum dehydrogenated at 550°C to obtain a coarse powder with a particle size of about 300 μm;
[0097] S1-2-2) Milling process: the coarse powder is pulverized into a fine powder with an average particle size of 3 μm by a jet mill.
[0098] S1-3) Molding process: Press the fine powder into a green body on a molding press with an orientation magnetic field great...
Embodiment 2
[0115] S1) Magnet manufacturing process:
[0116] S1-1) Smelting process: In atomic percentage, 12.5% of Nd, 1.5% of Dy, 0.5% of Al, 0.5% of Co, 0.05% of Cu, 0.2% of Nb, 5.9% of B and the balance Fe preparation raw materials; in the environment of argon protection, medium-frequency induction heating is used to melt in a vacuum melting furnace, and then cast on a rotating quenched copper roller at 1480 ° C to obtain an alloy sheet with an average thickness of 0.3 mm.
[0117] S1-2) Milling process:
[0118] S1-2-1) Coarse crushing process: the alloy flakes are hydrogenated and crushed under 0.08MPa hydrogen, and then dehydrogenated in a vacuum at 550° C. to obtain a coarse powder with a particle size of about 300 μm.
[0119] S1-2-2) Milling process: the coarse powder is pulverized into a fine powder with an average particle size of 3.0 μm by a jet mill.
[0120] S1-3) Molding process: Press the fine powder into a green body on a molding press with an orientation magnetic f...
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PUM
Property
Measurement
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Abstract
The invention provides a method for improving magnet coercive force. The method comprises the processes that a coating process is conducted, the surface of a magnet is coated with a coating material, and drying is conducted; an osmosis process is conducted, heat treatment is conducted on the magnet obtained from the coating process. The coating material comprises metal calcium particles and particles of materials containing rare-earth elements; the rare-earth elements are selected from at least one of praseodymium, neodymium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutecium. According to the method for improving the magnet coercive force, the coercive force of a permanent magnet material can be greatly improved, and remanence and magnetic energy product are reduced a little. In addition, by means of the method for improving the magnet coercive force, the dose of the rare-earth elements can be greatly reduced, and the production cost is reduced.
Description
technical field [0001] The invention relates to a method for increasing the coercive force of a magnet, in particular to a method for increasing the coercive force of a rare earth magnet. Background technique [0002] With the increasing demand for hybrid vehicles, pure electric vehicles and energy-saving air-conditioning compressors, the demand for rare earth permanent magnet materials with high coercive force (such as R-Fe-B series rare earth permanent magnets) is also increasing. bigger. The traditional method to increase the coercive force requires the use of a large amount of heavy rare earth elements, resulting in a substantial increase in the cost of the magnet, and will sacrifice part of the remanence and energy product. Microscopic studies have found that the grain boundary structure has a great effect on improving the coercive force of the magnet. Through diffusion infiltration (referred to as diffusion infiltration), the heavy rare earth elements enter the grain...
Claims
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Application Information
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