A kind of r-t-b series magnetic material and preparation method thereof
A R-T-B, magnetic material technology, applied in the direction of magnetic materials, magnetic objects, inductor/transformer/magnet manufacturing, etc., can solve the problems of high cost, no significant improvement, limited improvement, etc., to achieve the best remanence effect.
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Embodiment 1
[0106] (1) Melting process: According to the formula shown in Table 1, take 50-500 kg of the prepared raw materials, put them into a crucible made of alumina, and heat them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at 1400-1500°C in a vacuum of Pa.
[0107] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4°C / sec cooling rate to obtain quenched alloy.
[0108] (3) Hydrogen crushing process: At 20-25°C, vacuumize the hydrogen crushing furnace where the quenched alloy is placed 5×10 -2 Pa, and then feed hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. powder.
[0109] (4) Micro-grinding process: Under a nitrogen atmosphere with a content of less than 150ppm, under the condition of a crushing chamber pressure of 0.38MPa, the powder...
Embodiment 2
[0115] (1) Melting process: According to the formula shown in Table 1, take 50-500 kg of the prepared raw materials, put them into a crucible made of alumina, and heat them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at 1400-1500°C in a vacuum of Pa.
[0116] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.
[0117] (3) Hydrogen crushing process: At 20-25°C, vacuumize the hydrogen crushing furnace where the quenched alloy is placed 5×10 -2 Pa, and then feed hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. powder.
[0118] (4) Micro-grinding process: Under a nitrogen atmosphere with a content of less than 150ppm, under the condition of a crushing chamber pressure of 0.38MPa, the powde...
Embodiment 3
[0124] (1) Melting process: According to the formula shown in Table 1, take 50-500 kg of the prepared raw materials, put them into a crucible made of alumina, and heat them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at 1400-1500°C in a vacuum of Pa.
[0125] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.
[0126] (3) Hydrogen crushing process: At 20-25°C, vacuumize the hydrogen crushing furnace where the quenched alloy is placed 5×10 -2 Pa, and then feed hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. powder.
[0127] (4) Micro-grinding process: Under a nitrogen atmosphere with a content of less than 150ppm, under the condition of a crushing chamber pressure of 0.38MPa, the powde...
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