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 no significant improvement, high cost, limited improvement, etc.
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Embodiment 1~19
[0160] Table 1 Formula (wt%) of R-T-B series magnetic material
[0161]
[0162]
[0163] The formula shown in Table 1 is used as a raw material, and the following preparation process is adopted to prepare the materials of Examples 1-19:
[0164] (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.
[0165] (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.
[0166] (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 hydroge...
Embodiment 1
[0183] The material that embodiment 1 makes carries out FE-EPMA detection, wherein the distribution of each element sees figure 1 .
[0184] The vertical orientation planes of Examples 1 to 19 are as follows figure 2 Shown (the two-phase particles are Pr in the Fcc phase, and the three-phase particles are Pr(Ti / Nb / Zr)B in the Dhcp phase 2 ), figure 2 The results of the FE-EPMA single-point quantitative analysis of each position are as described in Table 4:
[0185] Table 4
[0186]
[0187] Points 1 to 3 mean that three points were measured at similar positions of the same phase (for example, three grain boundary phases were measured, and three grain boundary intersections were measured).
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