Gadolinium-containing sintered rare earth permanent magnet alloy and preparation method thereof
A technology of rare earth permanent magnets and alloys, which is applied in the field of magnetic materials, can solve the problems of increasing coercive force and limited temperature coefficient, narrow application range, and reducing costs, etc., and achieves the effect of simple and practical preparation method, low cost and low price
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Embodiment 1~6
[0034] By composition is (1)Nd 24.5 PR 5 Dy 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 Smelting ingots. Jet milling after hydrogen crushing, the prepared fine powder is oriented and formed in a magnetic field of 1.8-2T, and then isostatically pressed at 200MPa, and finally sintered at 1000-1200°C in a vacuum state to obtain a magnet at 480- Annealed at 600° C. for 5 hours to prepare a Gd-free NdFeB magnet as a control, see Example 1 in Table 1.
[0035] Using the method of the above-mentioned Example 1 to prepare different Gd contents between 0.5wt.% and 25wt.%, the components are (2) Nd respectively 24 PR 5 Dy 2.5 Gd 0.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(3)Nd 23.5 PR 5 Dy 2.5 Gd 1.0 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(4)Nd 22 PR 5 Dy 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(5)Nd 19.5 PR 5 Dy 2.5 Gd 5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(6)Nd 4.5 Dy 2.5 Gd 25 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 See Table 1 for the room t...
Embodiment 7~9
[0048] The components are respectively (7)Nd 27 Dy 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(8)Nd 27 Tb 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(9)Nd 22 PR 5 Tb 1.25 Dy 1.25 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 The ingots were prepared according to the methods of Examples 1-6, and the results are shown in Table 3.
[0049] table 3
[0050] Reality
Embodiment 10~13
[0052] The components are respectively (10)Nd 27 Dy 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(11)Nd 24.5 Dy 5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(12)Nd 27 Tb 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(13)Nd 24.5 Tb 5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 The ingots were prepared according to the methods of Examples 1-6, and the results are shown in Table 4.
[0053] Table 4
[0054] Reality
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