A kind of preparation method of sintered NdFeB permanent magnet
A permanent magnet, NdFeB technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of spread, unfavorable industry development, shrinking application market, etc., to reduce industrial costs, improve magnetic crystals Anisotropic field, the effect of promoting comprehensive utilization
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Embodiment 1
[0026] The sintered NdFeB permanent magnet is prepared according to the steps of "smelting → crushing → powder making → pressing molding → sintering and aging treatment". In the smelting step, the main phase alloy is (La 0.08 Ce 0.12 Gd 0.08 Dy 0.005 PrN 0.715 ) 0.29 (Al 0.007 Cu 0.0014 co 0.0057 Fe 0.9859 ) 0.70 B 0.01 , the composition of the PrNd-rich liquid phase alloy is (La 0.03 Ce 0.05 Gd 0.02 PrN 0.90 ) 0.55 (Al 0.68 Cu 0.23 co 0.91 Fe 0.9818 ) 0.44 B 0.01 , the composition of the liquid phase alloy rich in LaCe is (La 0.20 Ce 0.25 Gd 0.10 Dy 0.006 PrN 0.444 ) 0.45 (Al 0.0056 Cu 0.0028 co 0.0093 Fe 0.9823 ) 0.54 B 0.01 , where the mass percentages among the main phase, PrNd-rich phase, and LaCe-rich phase are 83%, 6.8%, and 10.2% in sequence, and the three alloys are smelted respectively;
[0027] In the powder making step, the amount of oxygen added is 100ppm; the specific surface average particle size SMD of the magnetic powder measur...
Embodiment 2
[0032] NdFeB permanent magnets are prepared according to the steps of "smelting → crushing → powder making → pressing molding → sintering and aging treatment". In the smelting step, the main phase alloy is (La 0.08 Ce 0.12 Gd 0.08 Dy 0.006 PrN 0.714 ) 0.298 (Al 0.0072 Cu 0.0014 co 0.0072 Fe 0.9841 ) 0.692 B 0.01 , the composition of the PrNd-rich liquid phase alloy is (La 0.03 Ce 0.05 Gd 0.02 Dy 0.005 PrN 0.895 ) 0.55 (Al 0.0068 Cu 0.0023 co 0.0045 Fe 0.9864 ) 0.44 B 0.01 , the composition of the liquid phase alloy rich in LaCe is (La 0.20 Ce 0.25 Gd 0.10 Dy 0.006 PrN 0.444 ) 0.45 (Al 0.0056 Cu 0.0028 co 0.0074 Fe 0.9842 ) 0.54 B 0.01 , wherein the mass percentages among the main phase, PrNd-rich phase, and LaCe-rich phase are 90%, 5%, and 5% in sequence, and the three alloys are smelted separately;
[0033] In the powder making step, the amount of oxygen added is 80ppm; the specific surface average particle size SMD of the magnetic powder mea...
Embodiment 3
[0038] NdFeB permanent magnets are prepared according to the steps of "smelting → crushing → powder making → pressing molding → sintering and aging treatment". In the smelting step, the main phase alloy is (La 0.06 Ce 0.12 Ho 0.04 Dy 0.08 PrN 0.7 ) 0.3 (Al 0.0116 Cu 0.0014 co 0.0058 Ga 0.0014 Nb 0.0058 Fe 0.974 ) 0.69 B 0.01 , the composition of the PrNd-rich liquid phase alloy is (La 0.03 Ce 0.05 Dy 0.005 PrN 0.915 ) 0.55 (Al 0.0068 Cu 0.0023 co 0.0045 Fe 0.9864 ) 0.44 B 0.01 , the composition of the liquid phase alloy rich in LaCe is (La 0.20 Ce 0.20 Gd 0.042 Dy 0.004 PrN 0.554 ) 0.45 (Al 0.0056 Cu 0.0028 co 0.0074 Fe 0.9842 ) 0.54 B 0.01 , wherein the mass percentages among the main phase, PrNd-rich phase, and LaCe-rich phase are 90%, 6%, and 4% in sequence, and the three alloys are smelted separately;
[0039] In the powder making step, the amount of oxygen added is 50ppm; the specific surface average particle size SMD of the magnetic pow...
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