Preparation method of NdFeB magnet with high coercivity
A high coercivity, NdFeB technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc. The problem of high activity, etc., can improve the coercivity of the magnet, the manufacturing process is simple, and the fluorine chemical stability is high.
Inactive Publication Date: 2018-01-12
YANTAI ZHENGHAI MAGNETIC MATERIAL
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The invention relates to a preparation method of an NdFeB magnet with high coercivity. The method includes the following steps that heavy rare earth powder is mixed with an anti-oxidizing agent, a binder and an organic solvent to prepare uniform slurry, wherein the heavy rare earth powder refers to one or a mixture of Dy, hydrogenated dysprosium, Tb and terbium hydride, the mass ratio of the heavyrare earth powder in the slurry is 40-80%, the mass ratio of the anti-oxidizing agent is 5-20%, the mass ratio of the binder is 2-10% and the balance organic solvent, and the anti-oxidizing agent refers to the anti-oxidizing agent containing fluorine; after the slurry covers the surface of a sintered magnet, the thickness of the slurry is controlled to 20-100 micrometers, and drying is then conducted; the dried magnet is then sintered, and aging treatment is conducted. The method can reduce the use amount of heavy rare earth powder such as Dy and Tb, meanwhile, the requirement of the grain boundary diffusion technology for the size of a product is met, the problem that fluoride and oxide coating powder is easy to fall off is solved, and the manufacturing process is simple.
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Property | Measurement | Unit |
Thickness | 20.0 ~ 100.0 | µm |
Thickness | 0.36 | mm |
Average particle size | 3.4 | µm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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