A method for in-situ coating of aluminum oxide insulating layer on the surface of metal soft magnetic powder

An aluminum oxide, metal soft magnetic technology, applied in magnetic objects, metal processing equipment, magnetic materials, etc., can solve the problems of poor thermal stability of polymer insulating layers, low bonding strength, uneven insulating coating layers, etc. Achieve high saturation magnetic induction, low loss, high utilization, and thin coating

Active Publication Date: 2019-11-19
山东恒瑞磁电股份有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Aiming at the defects of non-uniform insulating coating layer, low bonding strength with matrix, and poor thermal stability of polymer insulating layer in current soft magnetic composite materials, the present invention provides a metal soft magnetic powder surface in-situ coating Al 2 o 3 The insulating layer method uses a similar hydrothermal method to in-situ coat the aluminum hydroxide precursor on the metal soft magnetic surface, and then forms a uniform, dense, well-bonded and heat-resistant Al on the surface of the metal soft magnetic powder after high-temperature calcination. 2 o 3 Insulation

Method used

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  • A method for in-situ coating of aluminum oxide insulating layer on the surface of metal soft magnetic powder
  • A method for in-situ coating of aluminum oxide insulating layer on the surface of metal soft magnetic powder
  • A method for in-situ coating of aluminum oxide insulating layer on the surface of metal soft magnetic powder

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Effect test

Embodiment 1

[0028] Weigh three parts of 10g iron powder, the uncoated iron powder has a smooth surface, but has obvious pores, and the appearance is as follows: figure 1shown. According to the mass conversion of 0.1 g of elemental aluminum, weigh the aluminum sulfate compound with the corresponding aluminum molar amount, and prepare three solutions of 30 mL with deionized water. At the same time, the other part was used as a comparative example without adding surfactant. The pH of the solution was then adjusted to 6 by adding sodium acetate-acetic acid pH buffer. Add iron powder and aluminum salt solution into the hydrothermal reaction kettle, and stir for 20 minutes to make the metal magnetic powder evenly dispersed; place the hydrothermal reaction kettle in an oven, set the temperature to 55 °C, and keep the holding time for 3 hours to obtain Precursor-coated metal magnetic powder; the obtained precursor-coated metal magnetic powder is washed with water, magnetically separated, alcoho...

Embodiment 2

[0033] Weigh six parts of 10g iron-silicon-aluminum magnetic powder for each. According to the mass conversion of 0g, 0.01g, 0.1g, 0.15g, 0.2g, and 0.25g of elemental aluminum, weigh six parts of aluminum nitrate compound with the same molar amount as elemental aluminum respectively, and use deionized water to prepare six parts of 30mL each. solution. Add 0.15 g of surfactant sodium dodecyl sulfonate to each solution, stir well, and then add sodium dihydrogen phosphate-disodium hydrogen phosphate pH buffer to adjust the pH of the solution to 7. The iron-silicon-aluminum-based magnetic powder and the aluminum salt solution were added to the hydrothermal reaction kettle, and the stirring time was 20 min to make the metal magnetic powder evenly dispersed; 4h, the metal magnetic powder coated with the precursor was obtained; the obtained metal magnetic powder coated with the precursor was subjected to magnetic separation, water washing, alcohol washing, magnetic separation, dryin...

Embodiment 3

[0037] Weigh three parts of 10g iron-nickel-molybdenum magnetic powder. According to the mass conversion of 0.16 g of elemental aluminum, weigh the aluminum chloride compound of the corresponding aluminum molar amount, make a solution of 30 mL with deionized water, and add 0.005 g of surfactant DTAB to the solution, and stir well. The pH of the solution was then adjusted to 5 by adding sodium acetate-acetic acid pH buffer. The iron-nickel-based magnetic powder and the aluminum salt solution were added to the hydrothermal reaction kettle, and stirred for 20 minutes to make the metal magnetic powder evenly dispersed; the hydrothermal reaction kettle was placed in an oven, the temperature was set to 40 °C, and the holding time was 3 hours. , to obtain precursor-coated metal magnetic powder; the obtained precursor-coated metal magnetic powder was washed with water, magnetically separated, alcohol washed, magnetically separated, dried, and calcined at 900 °C for 3 h to obtain alumi...

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Abstract

The invention discloses a method for in-situ coating of an aluminum oxide insulating layer on the surface of a metal soft magnetic powder, using a similar hydrothermal method to in-situ coat an aluminum hydroxide precursor on the metal soft magnetic surface, and then calcining at a high temperature The surface of the metal soft magnetic powder forms a uniform and dense Al with good bonding force and strong heat resistance. 2 o 3 Insulation. This method uses alumina as the insulating coating layer, which has high resistivity, good heat resistance, and excellent insulation performance; the aluminum hydroxide precursor is coated in situ by a low-temperature similar hydrothermal method, which is simple in operation, strong in applicability, and low in energy consumption. Relatively low; through the directional modification of the chemical group of the surfactant, the directional deposition of aluminum hydroxide on the surface of the metal soft magnetic powder can be realized, so that the utilization rate of the aluminum salt is high, and the finally obtained alumina crystal is fine and evenly coated , the cladding layer is thin and the binding force is strong, which is beneficial to obtain the optimal magnetic properties.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal powders, and in particular relates to a metal soft magnetic powder coated with Al on the surface by similar hydrothermal reaction and subsequent high temperature treatment 2 O 3 method of insulating layers. Background technique [0002] Metal soft magnetic materials have the advantages of high magnetic permeability and high saturation magnetization, but their use is restricted due to low resistivity and easy generation of eddy current loss when used at high frequencies. Therefore, it is necessary to carry out insulation coating treatment on the surface to make metal soft magnetic composite powder. Compared with the metal soft magnetic composite material, it not only retains some of the excellent properties of the metal soft magnetic composite ferrite soft magnetic material, but also overcomes some defects of the two, and has excellent comprehensive performance. At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/14H01F1/147H01F41/00B22F1/02
CPCH01F1/14H01F1/14733H01F1/14766H01F1/14791H01F41/00B22F1/16
Inventor 郑精武雷建郑海达乔梁蔡伟车声雷李旺昌应耀余靓姜力强
Owner 山东恒瑞磁电股份有限公司
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