Preparation method of ferrum-nickle composite magnetic core subjected to cladding treatment

A coating and magnetic core technology, which is applied in the field of preparation of iron-nickel composite magnetic cores, can solve the problems that the soft magnetic composite materials cannot have excellent magnetic properties, the thermal expansion coefficient of the inorganic insulating layer cannot be changed, and the thermal expansion coefficients differ greatly. Excellent soft magnetic properties, good single-phase property, anti-oxidation effect

Inactive Publication Date: 2019-04-05
戴爱娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, the preparation of NiFe 2 o 4 There are many methods of nano-powder, such as mechanical alloying method can prepare nickel ferrite nano-crystal, but it needs a long time of grinding, time-consuming, high energy consumption, so the cost is high
[0004] The current conventional soft magnetic composite material coating method is mainly to phosphorylate the surface of iron powder particles to form a layer of phosphate insulating layer on the surface of the particles to increase the resistivity, but the coating layer containing P or S is harmful to the environment. serious pollution
The thermal expansion coefficient of the inorganic insulating layer and the magnetic powder differ greatly, and the thermal expansion coefficient of the inorganic insulating layer itself cannot be changed. In an environment with a large temperature difference or during long-term use, thermal stress will be generated in the magnetic powder, resulting in inorganic inclusions. Coated soft magnetic composite materials cannot have excellent magnetic properties

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get ferric chloride, oxalic acid and nickel chloride to be dissolved in hydrochloric acid solution, the mol ratio of standby ferric chloride, oxalic acid and nickel chloride is clarified after ultrasonic dispersion is 3:2:1, and the molar concentration of hydrochloric acid is 1.6 mol / L, The ratio of the total molar amount of ferric chloride, oxalic acid and nickel chloride to hydrochloric acid is 1:3.

[0021] Add complexing agent after the solution is clarified, add acrylamide after the complexing agent is completely dissolved, ultrasonically disperse evenly and clarify, the molar ratio of complexing agent, ferric chloride, nickel chloride and acrylamide is 1:1 : 6; adjust the pH to 2 with ammonia water, and finally heat the mixed solution at 60° C. to cause a thermal polymerization reaction, and the solution turns into a gel.

[0022] Dry the gel in a constant temperature drying oven at 110°C for 7 hours, then place it in a high-temperature furnace at 430°C for 50 min...

Embodiment 2

[0026] Get ferric chloride, oxalic acid and nickel chloride to be dissolved in hydrochloric acid solution, the mol ratio of standby ferric chloride, oxalic acid and nickel chloride is clarified after ultrasonic dispersion is 5:4:2, and the molar concentration of hydrochloric acid is 1.9 mol / L, The ratio of the total molar amount of ferric chloride, oxalic acid and nickel chloride to hydrochloric acid is 3:10.

[0027] Add a complexing agent after the solution is clarified, add acrylamide after the complexing agent is completely dissolved, ultrasonically disperse evenly and clarify, the molar ratio of complexing agent, ferric chloride, nickel chloride and acrylamide is 2:1 : 8; adjust the pH to 3 with ammonia water, and finally heat the mixed solution at 80° C. to cause thermal polymerization to occur, and the solution turns into a gel.

[0028] Dry the gel in a constant temperature drying oven at 120°C for 9 hours, then place it in a high-temperature furnace at 460°C for 70 mi...

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Abstract

The invention discloses a preparation method of a ferrum-nickle composite magnetic core subjected to cladding treatment. According to the preparation method, an NiFe2O4 magnetic nanoparticle is prepared by an improved sol gel method; a single phase property is good; the dispersion is relatively uniform; the preparation method is simple; and the cost is lower compared with the prior art. In addition, powder cladding is performed by adopting nano acid silica sol and nanoscale MgO dielectric material cladding treatment powder under argon shield, so that the oxidation of the powder is prevented; the eddy loss of a material is reduced; and the magnetic core has an excellent soft magnetic property and high magnetic induction intensity.

Description

Technical field [0001] The invention relates to the field of magnetic material manufacturing, in particular to a method for preparing a coated iron-nickel composite magnetic core. Background technique [0002] At present, power electronic devices are developing in the direction of energy saving, miniaturization and high precision. Soft magnetic materials with high saturation induction (BS), low loss and high permeability (μ) have become an important direction of research and development in the field of magnetic materials. Amorphous and nanocrystalline soft magnetic alloys have gradually become a hot spot for development by various related companies and research institutions in recent years because of their soft magnetic properties. [0003] NiFe 2 o 4 Type ferrite is a material with important application prospects. Because of their high magnetic permeability and low hysteresis loss, they are widely used in mutual inductance devices, magnetic core bearings, transfer switch...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F41/00H01F1/36
CPCH01F1/36H01F41/00H01F41/0246
Inventor 戴爱娟
Owner 戴爱娟
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