High performance soft magnetic ferrite materials doped with Ni-Zn series and preparation method thereof
A soft magnetic material and ferrite technology, applied in the field of high-performance doped nickel-zinc ferrite soft magnetic material and its preparation, can solve the problems of no signal, magnetic core burst, temperature rise, etc., and achieve a simple process. , the effect of light weight and low production cost
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[0032] The preparation method includes the following process steps and contents:
[0033] (1) Weigh the raw materials according to the designed composition of the Ni-Zn ferrite soft magnetic material, and add 0-10 wt% of dispersant and adhesive.
[0034] (2) Mix the so-called powder, high-purity and high-wear-resistant zirconia grinding medium, and deionized water in a polyurethane ball mill tank, and grind and mix them on a high-energy ball mill.
[0035] (3) Dry the ground and uniform slurry in the drying box.
[0036] (4) Grind the dried powder, mix and granulate.
[0037] (5) Select a sieve with a suitable aperture for sieving the powder after mixing and granulating.
[0038] (6) The ground powder is dry pressed into a mold with a specified specification and shape.
[0039] (7) The ferrite soft magnetic material is synthesized and sintered according to the preset sintering system.
[0040] In the ball mill, the grinding medium is a high-purity, high-wear-resistant zirconia grinding bal...
Example Embodiment
[0047] Example 1: Analyze commercially available pure ZnO, NiO, Fe 2 O 3 , Bi 2 O 3 , MnCO 3 , Al 2 O 3 For mixing, ZnO, NiO, Fe 2 O 3 , Al 2 O 3 According to the molar ratio, the ratio is ZnO: NiO: Fe 2 O 3 : Al 2 O 3 =49.40:25.00:25.00:0.60, relative to the total weight of other components, 1.0wt% of Bi is added 2 O 3 And 2.0wt% MnCO 3 , And add 0.3wt% polyvinyl alcohol and 0.05wt% Davon C. According to 1:4:2 powder: grinding ball: deionized water (mass ratio) into the polyurethane ball milling tank, after ball milling on the ball mill for 24 hours, drying in the air, in a drying box at 130 ℃ for 24 hours , After grinding and sieving, dry pressed into a ring shape, sintered at 1175℃ for 2 hours, kept at 300℃ for 2 hours, the heating rate was 2℃ / min, and cooled with the furnace.
[0048] The resulting material is pure phase spinel ferrite (see figure 1 ), the grain size is more uniform (see figure 2 ), the initial permeability μ at a frequency of 1MHz i 245.34, Curie temperature...
Example Embodiment
[0049] Example 2: Analyze commercially available pure ZnO, NiO, Fe 2 O 3 , Bi 2 O 3 , MnCO 3 , Pr 6 O 11 For mixing, ZnO, NiO, Fe 2 O 3 , Pr 6 O 11 According to the molar ratio, the ratio is ZnO: NiO: Fe 2 O 3 : Pr 6 O 11 =49.33:25.17:25.17:0.34, relative to the total weight of other ingredients, add 1.0wt% Bi 2 O 3 And 2.0wt% MnCO 3 , And add 0.3wt% polyvinyl alcohol and 0.05wt% Davon C. Put into a polyurethane ball mill at a mass ratio of 1:4:2 powder: zirconium balls: deionized water. After ball milling on a ball mill for 24 hours, it is dried in the air and in a drying box at 130°C for 24 hours. After grinding , Dry pressed into a ring shape, sintered at 1150°C for 2 hours, and kept at 300°C for 2 hours, with a heating rate of 2°C / min, and cooled with the furnace. The obtained material has a typical two-phase structure (including spinel phase and praseodymium ferrite phase as main components, see figure 1 ), the grain size is more uniform (see figure 2 ), the initial permea...
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