Dispersion method for sintering neodymium-iron-boron powder and sintered neodymium-iron-boron magnet
A technology of NdFeB and powder materials, which is applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of large particles and powder materials that are easy to report, so as to eliminate abnormal growth, improve grouping and reunion, and improve product quality. The effect of comprehensive magnetic properties
Inactive Publication Date: 2016-10-12
宁波永久磁业有限公司
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Problems solved by technology
[0004] Aiming at the deficiencies in the prior art, the present invention provides a method for dispersing sintered NdFeB powder and a sintered NdFeB magnet to solve the problem that the powder is easy to lump during the existing sintered NdFeB powder process. , the problem of forming large particles
Method used
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Embodiment 1
[0022] Embodiment 1, MxNy dispersant is ZrO,;
Embodiment 2
[0023] Embodiment 2, MxNy dispersant is Al 2 o3 ;
Embodiment 3
[0024] Embodiment 3, MxNy dispersant is DyF 2 ;
[0025] Then, the quick-setting thin strips are crushed by hydrogen crushing and jet milling to make alloy particle powder with an average particle size of 3.0 μm. The alloy powder is oriented and pressed under a magnetic field of 1.8T, and the pressed compact is subjected to 200MPa Cold isostatic pressing.
[0026] 3) In a vacuum sintering furnace, sinter the pressed green body at 1050°C for 3.5 hours, and then undergo primary tempering at 890°C for 2 hours and secondary tempering at 490°C for 3 hours to obtain a sintered magnet.
[0027] 4) Test the magnetic properties of the sintered magnet and detect the fracture after knocking;
[0028] 5) The magnetic properties of the magnet without dispersant are: Br=1.43T, Hcj=1018kA / m, and the squareness is 0.92; the magnetic properties of the magnet with dispersant are: Br=1.43T, Hcj=1027kA / m.
[0029] Through test comparison, it is found that the performance of the two magnets is...
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Abstract
The invention relates to a dispersion method for sintering neodymium-iron-boron powder and a sintered neodymium-iron-boron magnet. The method comprises the following steps: a) taking a neodymium-iron-boron alloy, and preparing a fast-setting thin belt by using a fast-setting belt throwing technique; b) adding an MxNy dispersing agent, stirring, and carrying out air grinding to obtain alloy powder; c) carrying out oriented compaction on the alloy powder in a magnetic field to obtain a green compact; and d) sintering the green compact to obtain the sintered neodymium-iron-boron magnet, wherein M is one or more of Dy, Tb, Ce, Co, Ni, V, Ti, Mo, Mn, Ga, Al, Cu, Zr, Ta, Ag, Si and Nb, and N is one or both of O and F. The added dispersing agent is capable of obviously improving the phenomena of huddling and aggregation of the powder, eliminating the abnormal growth phenomenon of the alloy grains, improving the grain structure of the magnet and enhancing the qualification rate of the product and the comprehensive magnetic properties of the product, has the advantages of simple technique and low cost, and is suitable for mass production.
Description
technical field [0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a method for dispersing sintered NdFeB powder and a sintered NdFeB magnet. Background technique [0002] In 1983, on the basis of extensive research on RE-Fe-X ternary alloys, Sagawa Masato and others in Japan used powder metallurgy to prepare Nd-Fe-B sintered magnets with a magnetic energy product of up to 290kJ / m3 , created the third generation of rare earth permanent magnet materials. Sintered Nd-Fe-B is widely used in military equipment, electroacoustic devices, motors, generators, computer hard disk drives (HDD), voice coil motors (VCM), human magnetic resonance imaging (MRI), microwave communication technology, controllers , instruments, magnetic separation equipment, magnetic chucks and other devices and equipment that require permanent magnetic fields. The sintered NdFeB magnet is composed of Nd2Fe14B compound as the main phase, surrounded...
Claims
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IPC IPC(8): H01F1/057B22F3/04B22F3/10
CPCH01F1/0573B22F3/04B22F3/1017H01F1/0575
Inventor 唐国才任春德周鸿波金伟洋金东杰李建忠邵海琴时锐
Owner 宁波永久磁业有限公司