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A kind of soft magnetic composite powder and preparation method thereof

A soft magnetic composite and powder technology, which is applied in the direction of magnetism of inorganic materials, can solve problems such as easy cracking of the oxide film, affecting the insulation effect, and difficulty in controlling the technical conditions of the thickness of the insulating film, and achieves excellent physical properties and magnetic properties. Excellent covering effect, convenient for mass production

Inactive Publication Date: 2016-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this process, the uniform oxidation of FeSiAl powder and the technical conditions for controlling the thickness of the insulating film are difficult to grasp, and the oxide film is easy to crack during the pressing and heat treatment process, which affects the insulating effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix FeSiAl powder with absolute ethanol, silane coupling agent and deionized water in a reaction kettle, and stir for 0.5h. Tetraethyl silicate (TEOS) and ammonia water (25wt%) were added to the mixture, and stirred at a reaction temperature of 40° C. for 3 h until the reaction was substantially complete. The mass percent of soft magnetic powder, absolute ethanol, deionized water, silane coupling agent, and silicon source precursor in the reaction system is: 1:10:1:0.05:0.4. The addition of ammonia water is used to adjust the pH value of the solution to be weakly alkaline 7-8. After the reaction, magnetic separation was performed, and the filtrate was washed several times with absolute ethanol and deionized water until the filtrate was clear, and dried completely in a 40°C drying oven. The magnetic SiO2 core-shell structure powder is obtained. Mix magnetic SiO2 core-shell structure powder, n-butyl borate, absolute ethanol, polyethylene glycol, and deionized water in a...

Embodiment 2

[0021] Mix FeSiAl powder with absolute ethanol, silane coupling agent and deionized water in a reaction kettle, and stir for 0.5h. Add the silicon source precursor and ammonia water (25wt%) to the mixed solution, and stir at a reaction temperature of 100° C. for 8 hours until the reaction is almost complete. The mass percent of soft magnetic powder, absolute ethanol, deionized water, silane coupling agent, and silicon source precursor in the reaction system is: 1:3:0.2:0.01:0.05. The addition of ammonia water is used to adjust the pH value of the solution to be weakly alkaline 7-8. After the reaction, magnetically separate, wash with absolute ethanol and deionized water several times until the filtrate is clear, and dry completely in a 100°C drying oven. The magnetic SiO2 core-shell structure powder is obtained. Mix magnetic SiO2 core-shell structure powder, n-butyl borate, absolute ethanol, polyethylene glycol, and deionized water in a reaction kettle, and stir thoroughly. ...

Embodiment 3

[0023]Mix FeSiAl powder with absolute ethanol, silane coupling agent and deionized water in a reaction kettle, and stir for 2h. Add the silicon source precursor and ammonia water (25wt%) to the mixed solution, and stir at a reaction temperature of 100° C. for 5 h until the reaction is almost complete. The mass percent of soft magnetic powder, absolute ethanol, deionized water, silane coupling agent, and silicon source precursor in the reaction system is: 1:5:0.6:0.03:0.2. The addition of ammonia water is used to adjust the pH value of the solution to be weakly alkaline 7-8. After the reaction, magnetically separate, wash with absolute ethanol and deionized water several times until the filtrate is clear, and dry completely in a 100°C drying oven. The magnetic SiO2 core-shell powder is obtained. Mix magnetic SiO2 core-shell structure powder, n-butyl borate, absolute ethanol, polyethylene glycol, and deionized water in a reaction kettle, and stir thoroughly. Acetic acid was a...

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Abstract

The invention discloses soft magnetism composite powder and a preparation method of the soft magnetism composite powder. The soft magnetism composite powder is the composite powder which has two layers of inorganic insulation coating structures, the inner core of the composite powder is magnetic particles of FeSiAl or FeSi, SiO2 in a network state is coated on the outer layer of the magnetic particles, and nanocrystalline B2O3 is coated outside the SiO2. The preparation method of the soft magnetism composite powder comprises the following steps: (1) preparing magnetism SiO2 core-shell structural powder; (2) uniformly mixing the magnetism SiO2 core-shell structural powder prepared in the step (1), borate N-butyl, absolute ethanol, polyethylene glycol and deionized water, dropwise adding acetic acid, adjusting the potential hydrogen (pH) value of the mixed solution to be 5-6, stirring the mixed solution for 1-5 hours at the temperature of 40 DEG C-80 DEG C till a complete reaction is achieved, and drying the mixed solution at the temperature 40 DEG C-100 DEG C till the weight is constant; and (3) calcining the dried powder at the temperature of 400 DEG C-500 DEG C for 1-2 hours under the protective atmosphere. The soft magnetism composite powder prepared through the method has a good physical performance and a good magnetic performance. Due to the fact that a B2O3 film is coated outside the SiO2 shell layer, the magnetic powder is enabled to have a crack self-healing capability under the condition of high temperature, the electrical resistivity of a magnetic powder core is improved, and the eddy-current loss of materials is reduced.

Description

technical field [0001] The invention relates to a soft magnetic composite powder and a preparation method thereof. Background technique [0002] Magnetic powder core is a kind of soft magnetic material formed by mixing and pressing ferromagnetic powder particles and insulating medium, also known as soft magnetic composite material or powder magnetic core. Commonly used magnetic powder cores include iron powder cores, permalloy powder cores, iron silicon magnetic powder cores and sendust powder cores. Senustin and FeSi powder cores are mainly used to replace iron powder cores, the loss is 80% lower than that of iron powder cores, and they can be used at high frequencies above 8kHz; the magnetic permeability is 26-125, and they are mainly used in AC inductors, output inductors, Line filters, power factor correction circuits, etc., are sometimes used as transformer cores instead of air-gapped ferrites. In the high-frequency field, the total loss of FeSiAl and FeSi magnetic po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/24B22F1/02
Inventor 李丽娅易健宏李爱坤吴隆文
Owner CENT SOUTH UNIV