High bending strength neodymium-iron-boron permanent magnet formula and processing method thereof
A technology of flexural strength and processing method, applied in the formulation of NdFeB permanent magnets with high flexural strength and its processing field, can solve the problem of low flexural strength of NdFeB permanent magnets, and achieve high flexural strength, high resistance to Good bending strength
Inactive Publication Date: 2018-08-17
DONGGUAN CITY JIADA MAGNETOELECTRICITY PROD CO LTD
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[0005] The purpose of the present invention is to solve the problem of low bending strength of NdFeB permanent magnets, and creatively provide a NdFeB permanent magnet formula and its processing method
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[0018] The present invention provides a NdFeB permanent magnet formula with high bending strength. The NdFeB permanent magnet formula is composed of the following mass ratios: Pr 5-7%, Nd 20-30%, Dy 1-3%, B 1-1.5%, Co 0.5-1.5%, Al 0.5-1.5%, Cu 0.05-0.15%, and the balance is Fe.
[0019] The preferred proportion of the Pr is 6%, the preferred proportion of the Nd is 25%, and the preferred proportion of the Dy is 2%. (It is not appropriate to disclose too much detail)
[0020] The present invention also provides a method for processing NdFeB permanent magnets, which is characterized in that,
[0021] (1) the formula material described in claim 1 is smelted in a vacuum quick-setting furnace, and poured into a metal sheet whose thickness is 0-0.6mm;
[0022] (2) Hydrogen is broken into particles of 1-200 μm in the hydrogen crushing furnace; it is broken into particles of 0-15 μm in the jet mill;
[0023] (3) Enter the forming press, form under a 2.0T magnetic field, and statica...
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Abstract
The invention provides a high bending strength neodymium-iron-boron permanent magnet formula and a processing method thereof. The formula includes Pr 5-7%, Nd 20-30%, Dy 1-3%, B 1-1.5%, Co 0.5-1.5%, Al 0.5-1.5%, Cu 0.05-0.15% and the balance Fe. The processing method includes the steps of (1), smelting formula materials in a vacuum quick-setting furnace according to claim 1, and casting into metalsheets with a thickness of 0-0.6 mm; (2), conducting hydrogen crushing in a hydrogen crushing furnace to form granules, and crushing into granules in an air-stream mill; (3), placing into a mouldingpress for moulding in a 2.0 T magnetic field, and conducting static pressing under 200 T pressure; (4), placing into a sintering furnace, and sintering under 1000-1100 DEG C. The neodymium-iron-boronpermanent magnet formula and the processing method are adjusted, and a product has very high bending strength.
Description
technical field [0001] The invention relates to a NdFeB processing formula with high bending strength and a processing method thereof Background technique [0002] The sintered Nd-Fe-B rare earth permanent magnet material is the most powerful permanent magnet material used today, and it is widely used in the fields of computers, nuclear magnetic resonance imaging, and micro motors. In more than 20 years from its invention to the present, its production technology and performance indicators have been developed rapidly. [0003] The production process is to crush the smelted Nd-Fe-B alloy, grind it into a fine powder with an average particle size of 2-5um, orient and press-form it in a uniform magnetic field, and then use a vacuum sintering furnace at 1000-1200°C Liquid phase sintering is carried out at high temperature to make its structure compact and form alloy products. [0004] The bending fracture strength of NdFeB permanent magnets is closely related to the crystal st...
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Login to View More IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0293
Inventor 羊哲詹前营张洪涛詹松根
Owner DONGGUAN CITY JIADA MAGNETOELECTRICITY PROD CO LTD