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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  • Abstract
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  • Application Information

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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 magnet

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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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Example Embodiment

[0026] Please refer to figure 1 , figure 1 The schematic diagram of the process of preparing the soft magnetic metal powder with negative thermal expansion coefficient and high insulation properties according to the present invention is shown. Such as figure 1 As shown, the preparation method of soft magnetic metal powder with negative thermal expansion coefficient and high insulation properties includes 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 vacuum degree is 4×10 -3 Pa, the temperature control accuracy is ±0.1°C; a magnetic field is added while the soft magnetic metal powder is heat-treated, and the magnetic field intensity is 0-4kA / m.

[0028] Prepare 0.5%-1% nano-zirconium hydroxide solution, 0.5%-1% nano-aluminum tungstate solution, 0.5%-2% aluminum dihydrogen phosphate solution and analytical pure phosphoric acid liquid ;

[0029] Wherein, the nano z...

Example Embodiment

[0035] Example one

[0036] 2500g of carbonyl iron powder is subjected to vacuum heat treatment, the conditions of the heat treatment are 800°C and the vacuum degree is 4×10 - 3 Pa, the temperature control accuracy is ±0.1°C, the magnetic field is added while the soft magnetic metal powder is heat-treated, and the magnetic field strength is 3kA / m;

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

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

[0039] Add the heat-treated carbonyl iron powder i...

Example Embodiment

[0050] Example two

[0051] 8000g iron-silicon-chromium alloy powder is subjected to vacuum heat treatment, the condition of the heat treatment is 1000°C and the vacuum degree is 4×10 -3 Pa, the temperature control accuracy is ±0.1°C, the magnetic field is added while the soft magnetic metal powder is heat-treated, and the magnetic field strength is 4kA / m;

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

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

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

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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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