A kind of ferrite soft magnetic powder core and preparation method thereof
A soft magnetic powder core and ferrite technology, applied in the field of magnetic powder cores, can solve the problems of insufficient saturation magnetic flux density and initial magnetic permeability, low saturation magnetic flux density and effective magnetic permeability, and failure to meet application requirements, etc. Achieve the effect of increasing effective permeability, high effective permeability and quality factor
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[0031] The present invention also provides a method for preparing a ferrite soft magnetic powder core, comprising the following steps:
[0032] (1) Ingredients: Weigh 40% to 99.9% of ferrite soft magnetic material powder and 0.1% to 10% of highly reducible metal powder and 0% to 50% of organic or inorganic insulating adhesive by weight percentage dispersant and 0% to 10% organic or inorganic dispersant to obtain a magnetic mixture, fully stirred, and the magnetic powder particles in the magnetic mixture are fully covered;
[0033] (2) Molding: put the mixture obtained in the above step (1) into a mold, and press the powder under a pressure of 0.5 to 3 GPa;
[0034] (3) Heat treatment: Put the magnetic powder core obtained by compression molding in the above step (2) into a high-temperature furnace filled with air or vacuum or inert gas for heat treatment. The temperature of the high-temperature furnace is set in the range of 300°C-1000°C, and the heat treatment time is at leas...
Embodiment 1
[0038] According to the preparation method of the above-mentioned ferrite soft magnetic powder core, it is 97.5% by weight to take manganese zinc ferrite soft magnetic powder with a particle size of 150 mesh and 0.1% by weight to take a particle size of 1000 mesh. Strong aluminum powder and the high-temperature silica gel insulating binder weighed as 2.4% by weight are mixed to obtain a magnetic mixture. After fully stirring, the magnetic mixture powder is put into a mold, and the powder is pressed and molded under a pressure of 2GPa, and the molded The magnetic powder core is heat-treated in a high-temperature furnace with air. The temperature of the high-temperature furnace is set at 500°C, and the heat treatment time is 1 hour, so that the highly reducible aluminum and the divalent iron in the ferrite soft magnetic material undergo a sufficient replacement reaction. , so that the magnetic powder core contains oxide components of iron and aluminum, and a ferrite soft magnetic p...
Embodiment 2
[0040] According to the preparation method of the above-mentioned ferrite soft magnetic powder core, it is 99.5% by weight to take manganese zinc ferrite soft magnetic powder with a particle size of 150 mesh and take 0.1% by weight to take a particle size of 1000 mesh for reduction Strong aluminum powder and the water glass insulating binder that weighed 0.4% by weight are mixed to obtain a magnetic mixture. After fully stirring, the magnetic mixture powder is put into a mold, and the powder is pressed into a mold under a pressure of 2GPa. The formed magnetic powder core is heat-treated in a high-temperature furnace with air. The temperature of the high-temperature furnace is set at 500°C, and the heat treatment time is 1 hour, so that the highly reducible aluminum and the divalent iron in the ferrite soft magnetic material are fully replaced. reaction, so that the magnetic powder core contains iron and aluminum oxide components, and a ferrite soft magnetic powder core within t...
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