Preparation method of sintered neodymium-iron-boron material
A technology of NdFeB and magnetic materials, applied in magnetic materials, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problems of low remanence and insufficient orientation degree of sintered NdFeB magnets, so as to avoid partial oxidation, The remanence will not decrease and the process is simple
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[0021] refer to figure 1 , the preparation method of the sintered NdFeB material of the embodiment of the present invention comprises the following steps:
[0022] In step 1, the NdFeB magnet raw material is subjected to quick-setting stripping to obtain NdFeB stripping sheets with a preset average thickness.
[0023] Specifically, the NdFeB magnet raw material includes the following components in mass percentage: Pr-Nd or Nd: 30.5%-32.5%, B: 0.85%-0.95%, A1: 0.5%-1.2%, Cu: 0.1 %~0.5%, Co:0.6%~2.0%, Ga:0.1%~0.6%, Zr:0.1%~0.3%, and the balance is Fe.
[0024] Preferably, the NdFeB magnet raw material includes the following components in mass percentage: Pr-Nd or Nd: 30.5%~31.5%, B: 0.85%~0.9%, A1: 0.5%~0.85%, Cu: 0.1%~0.25% %, Co:0.65%~1.2%, Ga:0.55%~0.6%, Zr:0.12%~0.18%, and the balance is Fe. In raw materials, because Ga can improve the fluidity of grain boundaries, high Ga content can promote the improvement of coercive force after grain refinement; low B content can avoi...
Embodiment 1
[0053] Weigh the raw materials according to the ratio of Pr-Nd 31%, B 0.90%, Al 0.85%, Cu 0.25%, Co 1.2%, Zr 0.18%, Ga 0.55%, and the balance is Fe, by weight percentage. The NdFeB cast pieces are prepared by the vacuum quick-setting method, and the average thickness of the NdFeB strip strips is 3±0.5mm; the NdFeB cast pieces are stored and transported in a nitrogen-protected sealing device to the hydrogen explosion device for hydrogen crushing, and the suction The hydrogen pressure is 0.1 MPa, and the dehydrogenation temperature is 580°C to obtain hydrogen crushed coarse powder; add 0.05% zinc stearate to the hydrogen crushed coarse powder for primary mixing, and pass the primary mixture through a jet mill to obtain SMD=2.5μm Jet milling fine powder, at the same time, pre-orientation treatment is carried out on the powder in the process of jet milling powder, the orientation device selects the induction coil, and in order to facilitate the observation of the state of the pre-o...
Embodiment 2
[0055] Weigh the raw materials according to the ratio of Pr-Nd 31%, B 0.90%, Al 0.85%, Cu 0.25%, Co 1.2%, Zr 0.18%, Ga 0.55%, and the balance is Fe, by weight percentage. The NdFeB cast pieces are prepared by the vacuum quick-setting method, and the average thickness of the NdFeB strip strips is 3±0.5mm; the NdFeB cast pieces are stored and transported in a nitrogen-protected sealing device to the hydrogen explosion device for hydrogen crushing, and the suction The hydrogen pressure is 0.15 MPa, and the dehydrogenation temperature is 580°C to obtain hydrogen crushed coarse powder; add 0.05% zinc stearate to the hydrogen crushed coarse powder for primary mixing, and pass the primary mixture through jet mill to obtain SMD=2.5 The micron jet mill fine powder, at the same time, pre-orientate the powder during the jet mill powder process, the orientation device selects the induction coil, and in order to facilitate the observation of the state of the pre-orientation powder, its posi...
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