Preparation method of NdFeB magnet with high coercivity
A high coercivity, NdFeB technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc. The problem of high activity, etc., can improve the coercivity of the magnet, the manufacturing process is simple, and the fluorine chemical stability is high.
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[0027] Example 1:
[0028] 1) Preparation of sintered magnet: the weight ratio of neodymium, praseodymium, dysprosium, terbium, electrolytic iron, cobalt, copper, gallium, aluminum, zirconium, and boron: Nd-23.8%, Pr-5%, Dy-0.6%, Tb -0.4%, Co-0.5%, Cu-0.13%, Ga-0.1%, Al-0.1%, Zr-0.12%, B-1% ratio, the balance is iron and unavoidable impurities, in an inert gas environment The pouring is completed in the lower vacuum melting furnace, the pouring temperature is 1450℃, the quench roll speed is 60r / min, and the quench roll is filled with cooling water. The thickness of the obtained flakes is about 0.36mm; then, the flakes are made by HD powdering and jet milling. Magnetic powder with an average particle size of 3.4μm; Oriented compaction at room temperature and a magnetic field intensity of 2T orientation field to form a compact; Put the compact into a sintering furnace in an Ar atmosphere and sinter at 1100°C for 5 hours to obtain a green compact. The green body is aged for 5 hours...
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[0041] Example 2:
[0042] 1) The weight ratio of neodymium, dysprosium, terbium, cobalt, copper, aluminum and boron: Nd-30.1%, Dy-0.5%, Co-0.8%, Cu-0.13%, Al-0.2%, B-1% Proportion, the balance is Fe and unavoidable impurities. The pouring is completed in a vacuum melting furnace under an inert gas environment, the pouring temperature is 1450℃, the quenching roller speed is 65r / min, and cooling water is passed through the quenching roller. The thickness of the obtained scale is about 0.32mm; Then, the scales are powdered by HD and jet milled to produce magnetic powder with an average particle size of 3.2μm; Orientation is pressed under an environment with a 2T orientation field at room temperature and a magnetic field strength to form a compact; In a sintering furnace under Ar atmosphere, sintered at 1060°C for 6 hours to obtain a green compact, and the green compact was aged at 510°C for 4 hours to obtain a sintered compact. Machining the sintered blank into a magnet with a siz...
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[0055] Example 3:
[0056] 1) The weight ratio of neodymium, dysprosium, terbium, cobalt, copper, aluminum and boron: Nd-30.5%, Tb-0.5%, Co-1.1%, Cu-0.16%, Al-0.4%, B-1.02% Proportion, the balance is Fe and unavoidable impurities. The pouring is completed in a vacuum melting furnace under an inert gas environment, the pouring temperature is 1460℃, the quenching roll speed is 70r / min, and cooling water is passed through the quenching roll. The thickness of the obtained scale is about 0.3mm; then the scales are made into magnetic powder with an average particle size of 3.0μm through HD powdering and jet milling; they are oriented and pressed in an environment with a 2T orientation field at room temperature and a magnetic field strength to form compacts; and then aging at 530℃ , The aging time is 4.0h, and the sintered blank is obtained. The sintered blank is processed into a magnet with a size of 40mm*20mm*4mm by machining, and after degreasing, pickling, activation, and deionized...
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