A kind of NdFeB magnetic material with superfine powder and its preparation method
A magnetic material and ultrafine powder technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of ultrafine powder storage, use danger and difficulty, low residual magnetization, easy oxidation and combustion, etc. Achieve the effects of improving comprehensive economic benefits, inhibiting grain growth, and protecting the environment
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Embodiment 1
[0028] Configure conventional alloys, the mass percentage composition of raw materials is: Pr-Nd-Dy: 25.5%, La-Ce: 5%, B: 1.0%, Fe: 67.5%, Al: 0.8%, Cu: 0.2%, using SC- Preparation of conventional alloy coarse particle powder by HD process: at 3.0×10 -1 Melted into thin slices with a thickness of 0.25-0.35mm under Pa vacuum, the thin slices absorb hydrogen at room temperature for 3.0 hours in the reaction kettle of the hydrogen crushing furnace, and then heat to 600°C for 6.0 hours to dehydrogenate to prepare a particle size of 60-80 mesh. Coarse powder for use;
[0029] The ultra-fine powder produced by the jet mill is uniformly mixed in the mixer for 1-3 hours.
[0030] The above-mentioned alloy coarse particle powder is ground by a QLM-400 jet mill under a working pressure of 0.7MPa to a fine powder with an average particle size of 3.0-3.5μm; %) ratio, add 15-20% of the above-mentioned superfine powder to the conventional alloy powder, and mix evenly in the mixer for 2 ho...
Embodiment 2
[0036] The difference from Example 1 is that the addition ratio of superfine powder is 10%, and other process routes are the same as in Example 1, and the test data are shown in Table 1.
[0037] The topography diagram relevant to this embodiment is similar to that of Embodiment 1, omitted.
[0038] as the picture shows, Figure 1-3 The microscope (SEM) topography in the figure is the scanning electron microscope (SEM) topography of the magnet after adding 10% (wt%) ultrafine powder and sintering; Figure 2-3 The curve in is the magnetization characteristic curve of 10% (wt%) superfine powder addition, which is shown by No. 3 in the test data in Table 1. Compared with the curve without superfine powder: the coercive force of the finished product is increased by 32.6 %, the squareness increased by 9.1%, and the residual magnetism decreased by 4.5%.
Embodiment 3
[0040] The difference from Example 1 is that the addition ratio of superfine powder is 15%, and other process routes are the same as in Example 1, and the test data are shown in Table 1.
[0041] The topography diagram relevant to this embodiment is similar to that of Embodiment 1, omitted.
[0042] as the picture shows, Figure 1-4 The microscope (SEM) topography in the figure is the scanning electron microscope (SEM) topography of the magnet after adding 15% (wt%) ultrafine powder and sintering; Figure 2-4 The curve in is the magnetization characteristic curve of 15% (wt%) superfine powder addition, which is shown in No. 4 of the test data in Table 1. Compared with the curve without superfine powder: the coercive force of the finished product is improved 38.3%, the squareness increased by 10.6%, and the residual magnetism decreased by 7.3%.
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Abstract
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