Regeneration method of rare earth permanent magnet material
A rare earth permanent magnet and recycled material technology, applied in the direction of magnetic materials, magnetic objects, process efficiency improvement, etc., can solve the problems of large test workload, large amount of new powder added, low efficiency, etc., to reduce production costs, add The effect of small amount and simple process
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Embodiment 1
[0016] Take SmCo 5 Non-oxidized recycled materials remove impurities, wash, degrease, and dry. Put the above-mentioned dried raw materials in a hydrogen treatment device, evacuate to below 1Pa, then pass hydrogen to 0.1Mpa, and keep for 30 minutes to obtain a coarse powder with an average particle size of less than 2 mm. The coarse powder is ground into a fine powder of about 5 microns by jet mill, and then press-molded under the conditions of a pressure of 200 MPa and a magnetic field strength of 15 kOe to make a blank. The blank was sintered under argon at a sintering temperature of 1125°C, kept for 2 hours, cooled to 900°C at a rate of 0.7°C / min, kept for 1 hour, and cooled to room temperature at a rate of 60°C / min. Measured B r =9.6kG s , i h e =26.7 Koe, (BH) max = 21.8 MGOe.
Embodiment 2
[0018] will Nd 15 Fe 76.5 al 0.5 B 8 The non-oxidizing scraps and scraps are cleaned, degreased, and dried. Put the above-mentioned dried raw materials in a hydrogen treatment device, evacuate to below 10Pa, then pass hydrogen to 0.1Mpa, and keep it for 20 minutes to obtain a coarse powder with an average particle size of less than 2 mm. The coarse powder is ground into a fine powder of about 5 microns by jet mill, and then the fine powder is mixed with 3% Nd-rich alloy powder whose nominal composition is Nd: 44wt%, Fe: 55wt%, B: 1wt%. The mixed fine powder is pressure-molded under the conditions of a pressure of 200Mpa and a magnetic field strength of 20 kOersted, and then the pressure is 2 tons / cm 2 Conditions for cold isostatic pressing, made into blanks. The blank was sintered in a vacuum state, the sintering temperature was 1080°C, the temperature was kept for 3 hours, the temperature was lowered to 900°C at a rate of 10°C / min, the temperature was kept at 2 hours, an...
Embodiment 3
[0020] will Nd 15 Fe 76.5 al 0.5 B 8 The scraps and scraps of oxidized materials are removed from debris, cleaned, degreased, and dried. The above-mentioned dried raw materials are placed in a hydrogen treatment device, vacuumed to below 1Pa, then hydrogen is passed to 1.0Mpa, and kept for 40 minutes to obtain a coarse powder with an average particle size of less than 2 mm. The coarse powder is ground into a fine powder of about 5 microns by jet mill, and then the fine powder is mixed with 20% Nd-rich alloy powder whose nominal composition is Nd: 44wt%, Fe: 55wt%, B: 1wt%. The mixed powder was press-molded under the conditions of a pressure of 200Mpa and a magnetic field strength of 20 kOersted, and then at 2 tons / cm 2 Conditions for cold isostatic pressing, made into blanks. The blank was sintered under vacuum at a sintering temperature of 1110°C, kept at a temperature of 3 hours, cooled to 900°C at a rate of 10°C / min, kept at a temperature of 2 hours, and cooled to room...
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