Holmium-contained Nd-Fe-B rare earth permanent magnetic material and manufacturing method thereof
A rare earth permanent magnet and neodymium iron boron technology, applied in the field of magnetic materials, can solve problems such as unspecified Ho, and achieve the effect of reducing costs
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Examples
Embodiment 1
[0044]A kind of neodymium iron boron rare earth permanent magnet material containing holmium, according to the batching described in following table 1:
[0045] Table 1
[0046]
[0047] Then adopt following steps to prepare NdFeB rare earth permanent magnet material:
[0048] (1) Smelting-casting: the raw materials are formed into molten alloy liquid by vacuum melting method, and then the molten alloy liquid is cast and cooled into a book-shaped alloy ingot with a thickness of about 20 mm;
[0049] (2) Pulverization: the ingot is pulverized into powder by the hydrogen crushing method, the average particle size is <1 mm, and pulverization: the powder with the average particle size of 3-5 μm is made by the jet mill method;
[0050] (3) Forming: the powder is pressed into a compact by molding;
[0051] (4) Sintering: sintering the compact in a vacuum sintering furnace at 1080°C for 4 hours;
[0052] (5) Tempering: Tempering the sintered compact in a vacuum sintering furnac...
Embodiment 2
[0059] The smelting step adopts vacuum smelting; the thickness of the alloy ingot is about 10mm; the ingot is crushed into powder by the mechanical coarse crushing method, and the average particle size is <1mm; forming: forming by molding and cooling isostatic pressing; sintering: the blank after forming Carry out sintering at 1085° C. for 1 hour in a vacuum sintering furnace; finally temper at 500° C. for 1 hour, and the rest of the steps are the same as in Example 1 to obtain NdFeB rare earth permanent magnet materials. See Table 3 for the results.
[0060] table 3
[0061]
[0062] By comparison, it can be found that the Hcj of the magnet of Example 2 added with Ho is 1.03 kOe higher than that of the existing magnet 2 without Gd added.
Embodiment 3
[0064] The smelting process adopts vacuum smelting, and the alloy ingot with a thickness of about 0.3mm is used; the solution heat treatment process (1090°C) is used between the casting and crushing processes; the ingot is crushed into powder by hydrogen crushing method, and the average particle size is <1mm; forming : Formed by rubber molding method; vacuum sintering furnace temperature is 1085°C, tempering temperature is 480°C, and the remaining steps are the same as implementation 1 to obtain NdFeB rare earth permanent magnet materials. The results are shown in Table 4.
[0065] Table 4
[0066]
[0067] By comparison, it can be found that the Hcj of the magnet of Example 3 added with Gd is 0.983 kOe higher than that of the existing magnet 3 without Ho added.
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Abstract
Description
Claims
Application Information
- IPC
- H01F1/057; C22C1/00
- Inventors
- 王胜华; 魏方允