Method for preparing insulated iron powder used by soft magnetic composite materials

A soft magnetic composite material, iron powder technology, applied in the direction of inorganic material magnetism, etc., can solve the problems of easy brittleness of the insulating film, complicated preparation process, uneven coating, etc., and achieves high efficiency, simple process, good high temperature resistance. performance effect

Active Publication Date: 2012-07-04
CENT IRON & STEEL RES INST
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  • Abstract
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Problems solved by technology

[0004] There are more or less problems in the preparation of insulating iron powder by the above methods, such as easy brittleness of the insulating film layer, uneven coating, complicated preparation process, low efficiency, etc. It is very necessary to further explore SMC insulating soft magnetic powder with excellent performance
So far, there is no domestic report on the use of hexafluorotitanic acid and hexafluorozirconic acid for iron powder insulation treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take a certain amount of hexafluorotitanic acid solution and add it to absolute ethanol to form a reaction solution, control the concentration of hexafluorotitanic acid to 0.005g / ml, heat the temperature of the reaction solution in a water bath to 30°C, and atomize the high-purity 99.5% Add iron powder (control its concentration to 0.2g / ml) into the reaction liquid and stir it mechanically for 30 minutes, wash with absolute ethanol three times after centrifugal filtration, and place it at 50°C to fully dry to obtain insulating iron powder. After the insulation treatment, the surface of the iron powder becomes smoother, the gloss is better, and the coating layer is uniform and complete. Comparing the magnetic properties of the core made of iron powder before and after the coating treatment, it is found that the maximum relative permeability of the insulated iron powder core changes from 328 to 291, and the magnetic loss at the magnetic induction 1T frequency 50Hz decrease...

Embodiment 2

[0022] The raw iron powder is mixed iron powder with a mass ratio of atomized iron powder and reduced iron powder of 1:1, and the purity is 99.3%. Take a certain amount of hexafluorozirconic acid solution and add it to anhydrous acetone to form a reaction solution, control the concentration of hexafluorozirconic acid to 0.05g / ml, heat the temperature of the reaction solution in a water bath to 60°C, and add the prepared mixed iron powder to the reaction solution In the process, the concentration of iron powder was controlled at 5g / ml, mechanically stirred for 60min, washed with anhydrous acetone for 3 times after centrifugal filtration, and fully dried at 120°C to obtain insulating iron powder. Comparing the magnetic properties of the core made of iron powder before and after coating treatment, it is found that the maximum relative permeability of the insulated iron powder core changes from 318 to 263, and the magnetic loss at the magnetic induction 1T frequency 400Hz drops fro...

Embodiment 3

[0024] The raw material iron powder is mixed iron powder with a mass ratio of atomized iron powder and carbonyl iron powder of 1:1, and the purity is 99.4%. Take a certain amount of hexafluorotitanic acid solution and add it to absolute ethanol to make a reaction solution, control the concentration of hexafluorotitanic acid to 0.02g / ml, heat the temperature of the reaction solution to 50°C in a water bath, and add the prepared mixed iron powder to the reaction solution In the process, the concentration of iron powder was controlled at 2 g / ml, mechanically stirred for 5 minutes, washed with absolute ethanol for 3 times after centrifugal filtration, and fully dried at 80°C to obtain insulating iron powder. Comparing the maximum relative magnetic permeability of the magnetic core made of iron powder before and after coating treatment from 302 to 225, the magnetic loss at the magnetic induction 1T frequency of 400Hz dropped from 196W / kg to 92W / kg.

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Abstract

A method for preparing insulated iron powder used by soft magnetic composite materials belongs to the technical field of magnetic function materials and powder metallurgy. The process is that a cladding process includes: adding high-purity iron powder with concentration of 0.1-5g / ml for industrialized production into hexafluorotitanic acid or hexafluorozirconic acid cladding solution with concentration of 0.002-0.05g / ml, stirring for 5-60 minutes for reacting at temperature of 20-70 DEG C, filtering and washing, and drying at 50-120 DEG C to obtain insulated iron powder. The method for preparing insulated iron powder used by soft magnetic composite materials has the advantages of being simple in preparing process, high in efficiency and complete in cladding. An insulated cladding layer onthe surface of the iron powder can effectively reduce magnetic loss of powder cores of the soft magnetic composite materials, and comprehensive performance of the powder cores can be regulated by controlling thickness of the insulated layer.

Description

technical field [0001] The invention belongs to the technical field of magnetic functional materials and powder metallurgy, and in particular relates to a preparation method of insulating iron powder for soft magnetic composite materials. Background technique [0002] Soft magnetic composites (Soft Magnetic Composites, hereinafter referred to as SMC) are manufactured by powder metallurgy technology and are composed of surface-insulated metal powder particles (such as pure iron powder), which can be pressed into parts with complex shapes in one step and have good three-dimensional properties. Isotropic magnetic properties and thermal characteristics, as well as low eddy current loss at medium and high frequencies, can be used as iron core materials in some motors with complex shapes and magnetic circuits and motors operating at higher frequencies, and can be widely used while being able to perform Revolutionizing power motor design. With the development of miniaturization an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01F1/33
Inventor 李一柳学全李发长李楠霍静丁存光李红印
Owner CENT IRON & STEEL RES INST
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