Magnetic powder core material with stable magnetic permeability and low loss and preparation method thereof
A magnetic powder core and magnetic permeability technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of reducing the magnetic permeability of soft magnetic composite materials, high production environment requirements, and low uniformity of insulating layers. To achieve the effect of ensuring high saturation magnetization, ensuring thickness and reducing porosity
Active Publication Date: 2018-07-27
TONGJI UNIV
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The invention relates to a magnetic powder core material with stable magnetic permeability and low loss and a preparation method thereof. First modifying the surface of the iron powder; preparing iron/ferrite composite powder with core-shell structure by high-energy ball milling; mixing the composite powder with the modified powder and then filling the mixture into an alloy steel mold for normal temperature pressing to obtain iron/ferrite soft magnetic composite magnetic powder cores; then performing subsequent heating treatment on the magnetic powder cores. Compared with the prior art, the present invention utilizes a ball milling method to prepare iron/ferrite coated powder. The process is short in time, uniform in coating, and simple in operation. At the same time, the present inventionuses a ferrimagnetic ferrite as an insulating coating agent, which reduces the magnetic dilution phenomenon caused by a non-magnetic substance as a coating agent. The suitable heat treatment temperature avoids the reaction between iron and ferrite during heat treatment to form magnetic disadvantageous components, ensures high saturation magnetization of magnetic powder core, high magnetic permeability, reduces loss, and obtains magnetic permeability of soft magnetic composite magnetic powder core.
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Property | Measurement | Unit |
Particle size | 30.0 ~ 100.0 | µm |
Particle size | 10.0 ~ 30.0 | µm |
Saturation magnetic induction | 207.0 | emu/g |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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