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A method for directly preparing alumina-coated ferrite by high-pressure ultrasonic spray pyrolysis

A technology of spray pyrolysis and high-voltage ultrasound, which is applied in the fields of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve the problems of uneven oxide film coating thickness, complex reaction control conditions, and long coating reaction time and other problems, to achieve the effect of good coating integrity, shortened reaction time, and low raw material cost

Active Publication Date: 2020-07-21
广州金意新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of preparing alumina-coated ferrite powder by the existing method, the ferrite powder agglomerates seriously during the coating process, the thickness of the oxide film coating layer is uneven, the coating reaction time is long, and the reaction control conditions are complicated.

Method used

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  • A method for directly preparing alumina-coated ferrite by high-pressure ultrasonic spray pyrolysis
  • A method for directly preparing alumina-coated ferrite by high-pressure ultrasonic spray pyrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown in the figure, after the spray precursor solid-liquid mixture 1 is atomized by the atomizing nozzle 3, it is transported into the tube furnace 4 by the carrier gas, and the water mist first undergoes the evaporation of the solvent (here, the evaporation of water), Then the solute is decomposed, and then the decomposed product is further oxidized, and finally the alumina-coated ferrite powder 5 is collected in the collector 6 . Carrier gas can choose N 2 , Ar or helium.

[0027] 80g manganese zinc ferrite powder is put into 1L colloidal palladium activation solution, and described colloidal palladium activation solution contains 0.5g palladium chloride, 15g tin protochloride, 150ml mass fraction is 37% hydrochloric acid, processes 10 Minutes, after centrifugation and organic alcohol cleaning, take out the manganese zinc ferrite powder, the particle size distribution is about 10-100 microns, such as figure 2 As shown in (a), its XRF data anal...

Embodiment 2

[0036] 120g nickel-zinc ferrite powder is put into 1L colloidal palladium activation solution, and described colloidal palladium activation solution contains 0.5g palladium chloride, 15g tin protochloride, and 150ml mass fraction is 37% hydrochloric acid, processes under ultrasonic wave 10 Minutes, centrifugal separation, cleaning with organic alcohol, take out the nickel-zinc ferrite, the particle size is about 10-100 microns.

[0037] Take 0.5mol / L Al 2 (SO 4 ) 3 Mix 200mL of the solution with 5g of nickel-zinc ferrite powder and pour it into figure 1 For the high-pressure bottle shown, heat the tube furnace to 850°C with a heating rate of 10°C / min (in the temperature range of 50-400°C) and 8L / min (in the temperature range of 400-850°C), and then turn on the high pressure bottle, the air pressure in the high-pressure bottle is 15MPa; tighten the pressure reducing valve of the nitrogen tank, set the gas flow rate to 3L / min through the gas flow meter, and carry the gas N 2...

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Abstract

The invention discloses a method for directly preparing alumina coated ferrite through a high-pressure ultrasonic spray pyrolysis method. A solid-liquid mixture composed of water-soluble aluminum saltand ferrite powder subjected to surface activation is taken as spray precursor solution, the solid-liquid mixture is prepared to be atomized through high-pressure ultrasonic spray, and composite ferrite powder coated with an alumina insulating layer on the surface is formed in a set tube furnace through the pyrolysis method. The method provided by the invention is simple to operate, has low costof raw materials and relatively less steps and needs short reaction time; the coated ferrite powder has excellent dispersity and cannot aggregate; the alumina coating layer formed on the surface is thin and compact, and coating is complete.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and relates to a method for preparing ferrite powder coated with an aluminum oxide insulating layer on the surface by pyrolysis of high-pressure ultrasonic spray. Background technique [0002] At present, the development of soft ferrite in the world tends to be balanced, and due to the surge in national electricity consumption and the vigorous development of the information industry in China, the demand for soft ferrite is also increasing. As a metal oxide, aluminum oxide has high resistivity, but its breakdown voltage is relatively small under high voltage. Therefore, an insulating layer such as aluminum oxide film is coated on the surface of ferrite powder to form a composite material. It can effectively increase the resistance of the ferrite, thereby increasing the breakdown voltage and effectively reducing its eddy current loss under alternating current, so that the appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/00H01F1/36
CPCH01F1/36H01F41/00
Inventor 郑精武郑海达乔梁车声雷李旺昌余靓蔡伟应耀
Owner 广州金意新材料有限公司
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