Preparation method of mu90 high-permeability Fe-based amorphous magnetic powder core
A high magnetic permeability and magnetic powder core technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems that it is difficult to further improve the magnetic permeability of amorphous magnetic powder cores, and achieve excellent DC bias characteristics, high magnetic The effects of conductivity, optimal loss characteristics and bias characteristics
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[0042] Example 1
[0043] The composition is Fe prepared by single-roll rapid quenching method 82 Si 2 B 14 C 2 Fe-based amorphous alloy ribbons, the amorphous alloy ribbons are preheated at 300°C for 1 hour in a nitrogen atmosphere, then mechanically milled and jet milled are combined to crush, and Fe-based amorphous alloys with a certain size range are screened Powder, of which -100 mesh ~ +140 mesh powder accounted for 20%, -140 mesh ~ +200 mesh powder accounted for 80%. The powder is mixed and stirred with 10% phosphoric acid alcohol solution, dried at 100°C and mixed with 2% cyanate resin and 2% SiO 2 Mix, coat and granulate, add 0.8% zinc stearate after stirring evenly, and press molding at room temperature. The pressing pressure is 2000MPa and the pressure holding time is 3s. The molded magnetic powder core was heat-retained at 320°C for 1 hour for stress relief annealing. The surface of the heat-treated magnetic powder core sample was coated with epoxy paint. The performa...
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[0051] Example 2
[0052] The Fe-based amorphous powder was prepared in the same manner as in Example 1. The particle size ratio was changed to: -100 mesh ~ +140 mesh powder accounted for 30%, -140 mesh ~ +200 mesh powder accounted for 70%, and the phosphoric acid alcohol solution The addition amount of SiO is changed to 5%, SiO 2 The addition amount of is changed to 1%, and the rest of the process conditions remain unchanged. The performance of the prepared magnetic powder core is as follows:
[0053] (1) Permeability μ=97.8 under 100kHz, 1V conditions;
[0054] (2) The frequency characteristics are shown in Table 3 below:
[0055] table 3
[0056]
[0057] (3) When the magnetic permeability drops to 50%, the DC bias magnetic field is H=102Oe;
[0058] (4) Under the condition of 100kHz and 0.1T, the magnetic powder core loss P cv =627kW / m 3 ;
Example Embodiment
[0059] Example 3
[0060] The Fe-based amorphous powder was prepared in the same way as in Example 1, and the particle size ratio was changed to: -100 mesh ~ +140 mesh powder accounted for 10%, -140 mesh ~ +200 mesh powder accounted for 90%, and the cyanate ester The addition amount of ® is changed to 3%, and the rest of the process conditions remain unchanged. The performance of the prepared magnetic powder core is as follows:
[0061] (1) Permeability μ=83.2 at 100kHz and 1V;
[0062] (2) The frequency characteristics are shown in Table 4 below:
[0063] Table 4
[0064]
[0065] (3) When the magnetic permeability drops to 50%, the DC bias magnetic field is H=110Oe;
[0066] (4) Under the condition of 100kHz and 0.1T, the magnetic powder core loss P cv =470kW / m 3 .
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