Preparation method and application of Nd2Fe14B/Al composite material
A nd2fe14b, composite material technology, applied in the direction of magnetic material, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problems of complex production process, large loss of magnetic properties, low density, etc., to achieve simple production process, compression Good strength, light weight effect
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Embodiment 1
[0037] (1) Ball milling:
[0038] The Al powder used in the experiment is a powder of 99.85% purity, and the average particle diameter is 10 μm; the NdFeB powder particle size is 15 μm, and the purity is 99.9%; 45g aluminum powder and 15g NdFeB (NdFeB) 2 Fe 14 B) powder mixing, adding 5% ethanol of the above-mentioned mixed powder quality, wet grinding in a planetary ball mill for 12 hours, putting the ball-milled powder into a vacuum drying oven to dry, and obtaining a mixed fine powder;
[0039] (2) Compression molding:
[0040] The mixed fine powder in the step (1) is compressed by cold isostatic pressing, pressurized at 100 MPa, and kept under pressure for 1 min to obtain a dense composite billet;
[0041] (3) Flash sintering:
[0042]Put the composite ingot in a vacuum flash furnace and connect it in series to the circuit for flash sintering, and raise the temperature to 550°C at 5°C / min. With a field strength of 100V / cm, when the temperature reaches a constant temper...
Embodiment 2
[0047] (1) Ball milling:
[0048] The Al powder used in the experiment is a powder of 99.85% purity, and the average particle diameter is 10 μm; the particle size of NdFeB powder is 15 μm, and the purity is 99.9%; 50g aluminum powder and 10g NdFeB (NdFeB) 2 Fe 14 B) powder mixing, adding 5% ethanol of the above-mentioned mixed powder quality, wet grinding in a planetary ball mill for 10 hours, putting the ball-milled powder into a vacuum drying oven to dry, and obtaining a mixed fine powder;
[0049] (2) Compression molding:
[0050] The mixed fine powder in the step (1) is compressed by cold isostatic pressing, pressurized at 105MPa, and kept under pressure for 1.5min to obtain a dense composite billet;
[0051] (3) Flash sintering:
[0052] Put the composite ingot in a vacuum flash furnace and connect it in series to the circuit for flash sintering, and raise the temperature to 580°C at 5°C / min. With a field strength of 1000V / cm, when the temperature reaches a constant t...
Embodiment 3
[0057] (1) Ball milling:
[0058] The Al powder used in the experiment is a powder of 99.85% purity, and the average particle diameter is 10 μm; the NdFeB powder particle size is 15 μm, and the purity is 99.9%; 56g aluminum powder and 8g NdFeB (NdFeB) 2 Fe 14 B) powder mixing, adding 5% ethanol of the above-mentioned mixed powder quality, wet grinding in a planetary ball mill for 11 hours, putting the ball-milled powder into a vacuum drying oven to dry, and obtaining a mixed fine powder;
[0059] (2) Compression molding:
[0060] The mixed fine powder in the step (1) is compressed by cold isostatic pressing, pressurized at 110MPa, and kept under pressure for 1min to obtain a dense composite billet;
[0061] (3) Flash sintering:
[0062] Put the composite ingot in a vacuum flash furnace and connect it in series to the circuit for flash sintering, raise the temperature to 610°C at 5°C / min, and at the same time start to heat up, apply 2000V, 5A power to the composite ingot Wi...
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