Method for ball-milling modified sol-gel coated magnetic powder core

A magnetic powder core and sol technology, which is applied in the direction of inorganic material magnetism, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of uncontrollable powder particle size and surface morphology, inability to adapt to magnetic powder core, high heat treatment temperature, etc., to achieve Low cost, reduced equipment requirements, and simple preparation equipment

Pending Publication Date: 2021-01-05
JIANGXI AITE MAGNETS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned existing use of sol-gel to combine nano-Al 2 o 3 Metal magnetic powder is coated, but the particle size and surface morphology of the powder are uncontrollable, and it cannot adapt to magnetic powder cores with different performance requirements. At the same time, the heat treatment temperature is too high, the requirements for equipment are high, and the energy consumption is large. The invention provides a ball mill Method of Modified Sol-Gel Coating Magnetic Powder Core

Method used

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  • Method for ball-milling modified sol-gel coated magnetic powder core
  • Method for ball-milling modified sol-gel coated magnetic powder core
  • Method for ball-milling modified sol-gel coated magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Put aluminum isopropoxide into deionized water, put it in a 95°C water bath and stir it magnetically for 80 minutes, then add HNO3 dropwise and continue magnetic stirring for 9.5 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:100:0.5 Continue to stand and age in a water bath at 95° C. for 19.5 hours after the magnetic stirring is completed; mix the AlOOH sol obtained by filtration with gas-atomized FeSi (chemically composed of 94.5% iron and 5.5% silicon) magnetic powder with an average particle size of 30 μm , the weight of the sol is 1% of the gas-atomized FeSi magnetic powder; then the mixture is kept in a drying oven at 150°C for 150min to obtain the AlOOH gel-coated powder; then the obtained powder is ball-milled in a ball mill, using and Two types of grinding balls, and The ratio of grinding balls is 1:3, the ball milling speed is 20r / min, and the ball milling is 12 hours.

[0042] The ball-milled powder is heated to 6...

Embodiment 2

[0049] Put aluminum isopropoxide into deionized water, pass through a water bath at 100°C and stir magnetically for 60 minutes, then add HNO3 dropwise and continue magnetic stirring for 6 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:90:0.4; After the magnetic stirring is completed, continue to stand and age in a water bath at 100°C for 15 hours; combine the AlOOH sol obtained by filtration with the gas-atomized FeSiAl (chemical composition: iron 87.8%, silicon 6.8% and aluminum 5.4%) magnetic powder with an average particle size of 35 μm Mix evenly, and the weight of the sol is 3% of the gas-atomized FeSiAl magnetic powder; then the mixture is kept in a drying oven at 120°C for 180 minutes to obtain an AlOOH gel-coated powder; then the obtained powder is ball-milled in a ball mill, using and Two types of grinding balls, and The ratio of grinding balls is 3:1, the ball milling speed is 50r / min, and the ball milling is 4 hours.

[...

Embodiment 3

[0057] Put aluminum isopropoxide into deionized water, put it in a 98°C water bath and stir it magnetically for 70 minutes, then add HNO3 dropwise and continue magnetic stirring for 8 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:80:0.3; After the magnetic stirring is completed, continue to stand and age in a water bath at 98°C for 17h; combine the AlOOH sol obtained by filtration with the gas-atomized FeSiAl (chemical composition: iron 87.8%, silicon 6.8% and aluminum 5.4%) magnetic powder with an average particle size of 38 μm Mix evenly, and the weight of the sol is 0.5% of the gas-atomized FeSiAl magnetic powder; then the mixture is kept in a drying oven at 150°C for 120 minutes to obtain an AlOOH gel-coated powder; then the obtained powder is ball-milled in a ball mill, using and Three kinds of grinding balls, The ratio of grinding balls is 3:6:1, the ball milling speed is 35r / min, and the ball milling is 8 hours.

[0058] Th...

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Abstract

The invention discloses a method for ball-milling a modified sol-gel coated magnetic powder core, which comprises the following steps: ball-milling AlOOH gel coated powder, and carrying out high-temperature heat treatment to obtain a more uniform and compact nano [alpha]-Al2O3 coated magnetic powder core. According to the invention, ball-milling AlOOH gel is adopted to coat the powder to obtain the nano [alpha]-Al2O3 coating layer, so that the coating layer is thin, more uniform and compact and has excellent insulativity; the heat treatment temperature of the ball-milled powder only needs 600-800 DEG C, so that the energy consumption is greatly reduced, and the requirements on equipment are also reduced; by controlling the process parameters such as ball milling time, the diameter of a grinding ball and the ball milling rotating speed, the particle size distribution and the morphology of the coated powder can be controlled, so that magnetic powder cores with different performance requirements are obtained; and the preparation equipment is simple, easy to operate, low in cost and particularly suitable for industrial large-batch and large-scale production.

Description

technical field [0001] The invention relates to the technical field of magnetic powder core preparation, in particular to a method for ball-milling modified sol-gel coated magnetic powder cores. Background technique [0002] Soft magnetic composite materials are mostly coated with multiple layers of inorganic and organic materials. As reported in the patent US2783208 applied by Katz, the double-layer cladding layer is phosphoric acid and thermosetting phenolic resin; while the patent US5063011 of Rutz uses iron phosphate and thermoplastic resin. Patent US4601765 of Soileau et al. reported that alkali metal silicate was used to coat first, and then coated with silicone resin. The double cladding layer can better meet the requirements of various properties (magnetic, mechanical, chemical, thermal properties, etc.). [0003] In recent years, ultrafine or even nanometer metal oxides (such as Al 2 o 3 、TiO 2 , SiO 2 , MgO 2 etc.) are commonly used as inorganic coatings. E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/24H01F41/02
CPCH01F1/24H01F41/02H01F41/0246
Inventor 张勉团皮金斌毛圣华陈俊杰温余远金鑫
Owner JIANGXI AITE MAGNETS
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