Amorphous soft magnetic powder core and its preparation method and application
A soft magnetic powder core, amorphous technology, applied in inductor/transformer/magnet manufacturing, transformer/inductor parts, electrical components, etc., can solve the problems of high frequency noise, high DC bias, low permeability, etc.
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[0029] There are still great difficulties in the preparation process of amorphous soft magnetic powder cores, which leads to the stagnation of the research and development of amorphous soft magnetic powder cores. The technicians found that the core reason lies in the high hardness and difficult deformation characteristics of the amorphous powder at room temperature, that is, the amorphous powder basically does not undergo plastic deformation during the press molding process at room temperature, so the density of the soft magnetic powder core is small, resulting in amorphous magnetic powder. The core magnetic permeability and strength are low, and the low loss characteristics of the amorphous magnetic powder core material after pressing are difficult to be fully utilized. Therefore, it is difficult to prepare amorphous soft magnetic powder cores by traditional compression molding technology.
[0030] In order to solve the above technical problems, the present invention proposes...
Embodiment 1
[0058] In this embodiment, iron-based amorphous soft magnetic alloy powder is used, and the composition is Fe76(SiB)24. The glass transition temperature (Tg) of the alloy powder was 350°C, and the crystallization temperature was 480°C. The alloy powder was prepared by water atomization, and the powder was classified by a slap-type vibrating sieve to obtain 80-mesh powder with an average particle size of D. 50 at 30µm.
[0059] The above alloy powder is passivated with 5 wt% phosphoric acid aqueous solution, the weight ratio of 5 wt% phosphoric acid aqueous solution and the above alloy powder is 1:20, and the alloy powder is dried at 100° C. to remove the solvent. Then add 1wt% low-melting glass, the softening point of the low-melting glass is 350°C, finally add 2wt% silicone resin binder and perform drying and pre-curing treatment at 100°C to obtain insulating coating powder.
[0060] The prepared insulating coating powder is spray-deposited (abbreviated as: cold deposition)...
Embodiment 2～5
[0068] In this embodiment, iron-based amorphous soft magnetic alloy powder is used, and the composition is Fe76(SiB)24. The superplastic temperature region of the alloy powder is 350°C, and the crystallization temperature is 480°C. The alloy powder was prepared by water atomization, and the powder was classified by a slap-type vibrating sieve to obtain 80-mesh powder with an average particle size of D. 50 at 30µm.
[0069] The above alloy powder is passivated with 5 wt% phosphoric acid aqueous solution, the weight ratio of 5 wt% phosphoric acid aqueous solution and the above alloy powder is 1:20, and is dried at 100° C. to remove the solvent. Then add 1wt% low-melting glass, the softening point of the low-melting glass is 350°C, finally add 2wt% silicone resin binder and perform drying and pre-curing treatment at 100°C to obtain insulating coating powder.
[0070] The prepared insulating coating powder is cold-deposited to finally form a ring-shaped magnetic powder core. Th...
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