A kind of preparation method of samarium iron nitrogen rare earth permanent magnet powder
A technology of rare earth permanent magnet and samarium iron nitrogen, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low nitriding efficiency, poor effect, complicated process, etc., and achieve low cost, simple process, and easy industrialization Effect
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Embodiment 1
[0024] (1) Lay water-atomized iron powder (-200 mesh) in a microwave rotary furnace, evacuate until the vacuum degree is below 10Pa, feed high-purity nitrogen with a purity of more than 99.9%, and keep the atmospheric pressure at 0.1MPa. Start microwave heating with a frequency of 2.45GHz, a power of 1KW, a synthesis temperature of 800°C, and keep warm for 2h. After cooling to room temperature, the synthesized product is iron nitride powder with a nitrogen content of 3wt.%.
[0025] (2) Mix the pure samarium powder and the iron nitride powder prepared above according to the molar ratio of Sm and Fe of 2:17, mix them initially, put the mixture and alumina balls into the ball milling tank, the ball-to-material ratio is 10:1, and the ball milling time 5h, the ball milling medium is high-purity nitrogen. After the ball milling is completed, the Sm 2 Fe 17 N x Rare earth permanent magnet powder, magnetic property is B r =0.8T, i h c =1950KA / m, (BH) m =156kJ / m 3 .
Embodiment 2
[0027] (1) Lay ultra-fine reduced iron powder (5 μm) in the boat of the microwave boat pusher, evacuate until the vacuum degree is below 10Pa, pass through the decomposed ammonia gas with a purity of more than 99.9%, and keep the atmospheric pressure at 0.05MPa . Start the microwave heating, the frequency is 2.45GHz, the power is 3KW, the synthesis temperature is 600°C, and the temperature is kept for 3h. After cooling to room temperature, the synthesized product is iron nitride powder with a nitrogen content of 4.8wt.%.
[0028] (2) Mix the pure samarium powder and the iron nitride powder prepared above according to the molar ratio of Sm and Fe of 2:17, mix them initially, put the mixture and alumina balls into the ball milling tank, the ball-to-material ratio is 15:1, and the ball milling time 8h, the ball milling medium is high-purity nitrogen. After the ball milling is completed, the Sm 2 Fe 17 N x Rare earth permanent magnet powder, magnetic property is B r =0.9T, ...
Embodiment 3
[0030] (1) Lay carbonyl iron powder (3 μm) in a microwave rotary furnace, evacuate until the vacuum degree reaches below 10 Pa, feed high-purity ammonia gas with a purity of more than 99.9%, and keep the atmospheric pressure at 0.01 MPa. Start microwave heating, the frequency is 2.45GHz, the power is 5KW, the synthesis temperature is 500°C, and the temperature is kept for 5h. After cooling to room temperature, the synthesized product is iron nitride powder with a nitrogen content of 6.2wt.%.
[0031] (2) Mix the pure samarium powder and the iron nitride powder prepared above according to the molar ratio of Sm and Fe of 2:17, mix them initially, put the mixture and alumina balls into the ball mill tank, the ball-to-material ratio is 20:1, and the ball milling time 10h, the ball milling medium is high-purity nitrogen. After the ball milling is completed, the Sm 2 Fe 17 N x Rare earth permanent magnet powder, magnetic property is B r =0.9T, i h c =2306KA / m, (BH) m =197kJ / ...
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