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Soft magnetic metal powder with negative thermal expansion coefficient and high insulation property and preparation method thereof

A technology of negative thermal expansion coefficient and soft magnetic metal, which is applied in metal processing equipment, inductance/transformer/magnet manufacturing, inorganic material magnetism, etc., can solve problems such as poor insulation properties, product cracking, and easy expansion when heated, so as to improve insulation properties , reduce thermal expansion problem, simple operation effect

Active Publication Date: 2020-08-28
安徽博微新磁科技有限公司
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Problems solved by technology

[0003] In view of the above problems, the present invention proposes a soft magnetic metal powder with a negative thermal expansion coefficient and high insulation properties and a preparation method thereof, so as to solve the problem that the soft magnetic metal powder prepared by the existing soft magnetic metal powder preparation method is easy to expand when heated, and is easy to cause product cracking , At the same time, the effect of powder coating is not good, and the insulation properties are poor

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  • Soft magnetic metal powder with negative thermal expansion coefficient and high insulation property and preparation method thereof

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[0026] Please refer to figure 1 , figure 1 It shows a schematic flow chart of the present invention for preparing soft magnetic metal powder with negative thermal expansion coefficient and high insulation properties. Such as figure 1 As shown, the preparation method of the soft magnetic metal powder with negative thermal expansion coefficient and high insulating properties comprises the following steps:

[0027] The soft magnetic metal powder is subjected to vacuum heat treatment, wherein the conditions of the heat treatment are 800-1000°C, and the degree of vacuum is 4×10 -3 Pa, the temperature control accuracy is ±0.1°C; a magnetic field is added while heat-treating the soft magnetic metal powder, and the magnetic field strength is 0-4kA / m.

[0028] Preparation of nano-zirconium hydroxide solution with a mass fraction of 0.5%-1%, nano-aluminum tungstate solution with a mass fraction of 0.5%-1%, aluminum dihydrogen phosphate solution with a mass fraction of 0.5%-2%, and an...

Embodiment 1

[0036] Carry out vacuum heat treatment with 2500g carbonyl iron powder, the condition of described heat treatment is 800 ℃, vacuum degree 4×10 - 3 Pa, temperature control accuracy ±0.1°C, adding a magnetic field while heat-treating the soft magnetic metal powder, the magnetic field strength is 3kA / m;

[0037] Prepare 500 g of nano-zirconium hydroxide ethanol solution with a mass fraction of 0.5%, 500 g of nano-aluminum tungstate ethanol solution with a mass fraction of 0.6%, 500 g of distilled aqueous solution of aluminum dihydrogen phosphate with a mass fraction of 0.5%, and 100 g of analytically pure phosphoric acid liquid;

[0038] Mix 400g of nano-zirconium hydroxide, 200g of nano-aluminum tungstate, and 100g of aluminum dihydrogen phosphate evenly, add phosphoric acid for titration, adjust the pH value of the solution to 3, and obtain a mixed solution;

[0039] Add the heat-treated carbonyl iron powder into the mixed solution, ultrasonically treat for 90 minutes, heat to...

Embodiment 2

[0051] Carry out vacuum heat treatment with 8000g FeSiCr alloy powder, the condition of described heat treatment is 1000 ℃, vacuum degree 4×10 -3 Pa, temperature control accuracy ±0.1°C, adding a magnetic field while heat-treating the soft magnetic metal powder, the magnetic field strength is 4kA / m;

[0052] Prepare 1000 g of nano-zirconium hydroxide ethanol solution with a mass fraction of 0.8%, 1000 g of nano-aluminum tungstate ethanol solution with a mass fraction of 1%, 500 g of distilled aqueous solution of aluminum dihydrogen phosphate with a mass fraction of 2%, and 100 g of analytically pure phosphoric acid liquid;

[0053] Mix the three solutions of 500g nanometer zirconium hydroxide, 800g nanometer aluminum tungstate, and 500g aluminum dihydrogen phosphate evenly, add phosphoric acid for titration, adjust the pH value of the solution to 3, and obtain a mixed solution;

[0054] Add the heat-treated iron-silicon-chromium alloy powder into the mixed solution, ultrasonic...

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Abstract

The invention provides soft magnetic metal powder with a negative thermal expansion coefficient and a high insulation property and a preparation method thereof. The preparation method comprises the following steps that soft magnetic metal powder is subjected to vacuum heat treatment; a nano zirconium hydroxide solution, a nano aluminum tungstate solution and an aluminum dihydrogen phosphate solution are prepared, and mixed evenly, phosphoric acid is added for titration, and the pH value of the solution is adjusted to 3-4 to obtain a mixed solution; the soft magnetic metal powder after the vacuum heat treatment is added into the mixed solution, ultrasonic treatment is carried out for 45-90 minutes, and the mixed solution is heated to 110 DEG C, and stirred to obtain a pre-finished product;and the pre-finished product is subjected to atmosphere protection heat treatment at 500-650 DEG C for 3-6 hours, and cooled to room temperature to obtain the soft magnetic metal powder with the negative thermal expansion coefficient and the high insulation property. According to the invention, soft magnetic metal powder with the negative thermal expansion coefficient is prepared through compositereaction, the thermal expansion problem of powder and a product can be reduced, and meanwhile, a coating insulating layer is better formed on the surface of the powder, so that the insulation property of the powder is greatly improved.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, in particular to soft magnetic metal powder with negative thermal expansion coefficient and high insulation properties and a preparation method thereof. Background technique [0002] Magnetic materials are widely used in electronic and electrical products, and are one of the basic materials in the material industry. It has special functions such as energy conversion and storage. At present, the soft magnetic composite material obtained by coating the insulating film on the surface of ferromagnetic particles has a series of unique properties compared with the traditional laminated rigid magnetic core, such as three-dimensional isotropic magnetic properties, extremely low eddy current loss, flexible It is precisely because of these characteristics that soft magnetic composite materials have broad application prospects. However, electronic products made of soft magnetic materials will ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F1/02H01F1/20H01F41/02
CPCH01F1/20H01F41/0253B22F1/142B22F1/16
Inventor 李伟健李媛媛刘国安方玲柳军涛钱小龙
Owner 安徽博微新磁科技有限公司
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