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Preparation method of iron-silicon-aluminum sheet-shaped magnetic powder with surface coated with titanium dioxide in insulating mode

A technology of titanium dioxide and insulation coating, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of complex process, poor compactness, and poor high temperature resistance, so as to save process flow and enhance compactness performance, the effect of strengthening the insulation effect

Inactive Publication Date: 2020-12-11
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: To solve the problems of poor high temperature resistance of sendust soft magnetic materials, poor compactness and complicated process of the existing insulation coating method, the present invention provides a sendust sheet with surface insulation coated with titanium dioxide The preparation method of magnetic powder, the impedance matching of the prepared sendust flake magnetic powder at high frequency is effectively improved, and the microwave absorption performance is significantly improved

Method used

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  • Preparation method of iron-silicon-aluminum sheet-shaped magnetic powder with surface coated with titanium dioxide in insulating mode

Examples

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Effect test

Embodiment 1

[0025] (1) Weigh 800 grams of 400-mesh sendust metal raw powder, prepare 1 L of 0.05mol / L sodium hydroxide solution, add sendust aluminum powder into the sodium hydroxide solution and mechanically stir for 1 hour, then filter and process the metal The powder is dried in a vacuum drying oven at 50°C, and then 5% xylene solution of silane coupling agent is added thereto, mechanically stirred for 2 hours, placed in a ventilated drying cabinet to dry naturally, and the metal magnetic powder is collected and stored in vacuum.

[0026] (2) Divide the metal magnetic powder obtained in step (1) into four equal parts, place 200 grams of each in four zirconia ball milling jars, keep the ball-to-material ratio in the ball milling jars at 10:1, add 5 grams of KH550, 4 grams of glyceryl trioleate, 280 grams of ethanol, 20 grams of deionized water, 10 grams of tetrabutyl titanate, and 0.5 grams of phosphoric acid; after vacuuming, flush into nitrogen protection, set the rotating speed to 400...

Embodiment 2

[0041](1) Weigh 800 grams of 350-mesh sendust metal raw powder, prepare 1.2 L of 0.01mol / L sodium hydroxide solution, add sendust aluminum raw powder into the sodium hydroxide solution and mechanically stir for 1 hour and then filter it. The metal powder is dried in a vacuum drying oven at 50°C, and then 3% xylene solution of silane coupling agent is added thereto, mechanically stirred for 2 hours, placed in a ventilated drying cabinet to dry naturally, and the metal magnetic powder is collected and stored in vacuum.

[0042] (2) Divide the metal magnetic powder obtained in step (1) into four equal parts, place 200 grams of each in four zirconia ball milling jars, keep the ball-to-material ratio in the ball milling jars at 10:1, add 3 grams of KH550, 3 grams of triolein, 290 grams of ethanol, 20 grams of deionized water, 10 grams of tetrabutyl titanate, and 0.4 grams of phosphoric acid. After vacuuming, flush into nitrogen protection, set the rotating speed to 450 rpm, the bal...

Embodiment 3

[0045] (1) Weigh 800 grams of 350-mesh sendust metal raw powder, prepare 1.2L of 0.1mol / L sodium hydroxide solution, add sendust aluminum raw powder into the sodium hydroxide solution and mechanically stir for 1 hour and then filter it. The metal powder is dried in a vacuum drying oven at 50°C, and then 3% xylene solution of silane coupling agent is added thereto, mechanically stirred for 2 hours, placed in a ventilated drying cabinet to dry naturally, and the metal magnetic powder is collected and stored in vacuum.

[0046] (2) Divide the metal magnetic powder obtained in step (1) into four equal parts, place 200 grams of each in four zirconia ball milling jars, keep the ball-to-material ratio in the ball milling jars at 10:1, add 3 grams of KH550, 3 grams of triolein, 290 grams of ethanol, 20 grams of deionized water, 20 grams of tetrabutyl titanate, and 0.8 grams of phosphoric acid. After vacuuming, flush into nitrogen protection, set the rotating speed to 350 rpm, the ball...

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Abstract

The invention discloses a preparation method of iron-silicon-aluminum sheet-shaped magnetic powder with the surface coated with titanium dioxide in an insulating mode. The preparation method comprisesthe following steps that 1, surface hydroxyl treatment is conducted on the iron-silicon-aluminum magnetic powder; 2, the iron-silicon-aluminum magnetic powder subjected to surface hydroxyl treatmentis put into a ball milling tank, a a precursor tetrabutyl titanate is added, flaky iron-silicon-aluminum powder is formed through high-energy ball milling, and the surface of the flaky iron-silicon-aluminum powder is coated with titanium dioxide; and 3, high-temperature annealing is carried out on the flaky iron-silicon-aluminum powder obtained in the step 2. According to the preparation method, the iron-silicon-aluminum magnetic powder with the insulated and coated surface is prepared through hydrolysis of tetrabutyl titanate, surface coating and magnetic powder flaking are completed in one step, the preparation method is simple and convenient, coating of titanium dioxide is tighter, and the insulation effect can be effectively enhanced; and meanwhile, through high-temperature annealing treatment, the compactness of titanium dioxide surface coating is enhanced while the iron-silicon-aluminum crystal form is recovered, and the wave absorbing performance and the insulating effect of theiron-silicon-aluminum magnetic powder are further improved.

Description

technical field [0001] The invention relates to a preparation method of sendust flake magnetic powder, in particular to a preparation method of sendust flake magnetic powder whose surface is insulated and coated with titanium dioxide, and belongs to the technical field of alloy magnetic powder preparation. Background technique [0002] With the development of modern electronic technology, the wave-absorbing materials are developing in the direction of "light", "thin", "high" and "strong". When designing a wave-absorbing material, two issues should be considered. 1) When the electromagnetic wave encounters the surface of the wave-absorbing material, it should pass through the surface as much as possible to reduce reflection; 2) When the electromagnetic wave enters the inside of the wave-absorbing material, the energy of the electromagnetic wave should Lose as much as possible. At the same time, the former requires impedance matching, and the latter requires magnetic loss or ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/147
CPCH01F41/026H01F1/14791
Inventor 余建明鲁振达董训益
Owner NANJING UNIV
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