A kind of insulating powder technology for difficult passivation magnetic powder and the magnetic powder prepared therefrom

A technology of insulating powder and magnetic powder, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of large eddy current loss, poor insulation performance, shrinkage, etc., to achieve improved reliability, high insulation performance, The effect of improving the pressing performance

Active Publication Date: 2021-07-27
SHENZHEN MICROGATE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: poor coating uniformity and shrinkage during baking;
Disadvantages: The amount of insulating agent used is large, which has a great influence on the magnetic properties of magnetic powder; the uniformity of magnetic powder coating with sharp angles is poor;
Disadvantages: not suitable for all magnetic powders, poor insulation effect for magnetic powders that are difficult to passivate: such as Ni, Cr crystalline alloy magnetic powders, amorphous magnetic powders, nanocrystalline magnetic powders, etc. are difficult to insulate with passivation
[0006] If the insulation performance of the magnetic powder is poor, the eddy current loss will be large after being pressed into the product and the product reliability will be poor

Method used

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  • A kind of insulating powder technology for difficult passivation magnetic powder and the magnetic powder prepared therefrom
  • A kind of insulating powder technology for difficult passivation magnetic powder and the magnetic powder prepared therefrom
  • A kind of insulating powder technology for difficult passivation magnetic powder and the magnetic powder prepared therefrom

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Effect test

Embodiment 1

[0021] like figure 1 As shown, the present invention provides a device used in the carbonyl decomposition coating method, which includes a device for decomposing Fe(CO) 5 Decomposition device, for placing Fe(CO) 5 The heating device for heating the decomposition device, the coating device connected with the heating device for coating the hard-to-passivate magnetic powder, and the storage liquid for treating the tail gas connected with the coating device tank, the coating device can be rotated during the coating operation to improve the efficiency of coating; the liquid storage tank includes a first liquid storage tank stored with potassium permanganate solution and a storage tank for storing water The second liquid storage tank, the first liquid storage tank that described potassium permanganate solution is stored is used for intercepting unreacted complete Fe(CO) 5 and Fe(CO) 5 The carbon monoxide generated after decomposition is oxidized into harmless carbon dioxide to th...

Embodiment 2

[0029] The application also provides a device used in the spray coating method, such as figure 2 As shown, the device includes a cladding layer melting device, a heating device for heating the cladding layer melting device and a hard-to-passivation magnetic powder spraying device located below the cladding layer melting device. The passivation magnetic powder spraying device sprays hard-to-passivate magnetic powder, and the coating layer melting device controls the outflow of molten easy-passivation magnetic powder through a valve, and the hard-to-passivation magnetic powder is coated by the easy-passivation magnetic powder.

[0030] How to use the device as figure 2 As shown, a. Turn on the heating device to melt the coating layer into a molten state; b. Put the hard-to-passivate magnetic powder to be coated into the related device of the injection nozzle; c. Open the valve to let the molten coating layer flow out, and open the Injection nozzle, so that the hard-to-passiva...

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Abstract

An insulating powder process for hard-passivation magnetic powder and magnetic powder prepared therefrom, the present invention relates to a novel insulation process for hard-passivation magnetic powder, and the technical scheme of the present invention is to coat the surface of hard-passivation magnetic powder first A layer of easily passivated magnetic powder forms a structure similar to "core-shell": the hard-to-passivated magnetic powder is the "core" and the easily passivated magnetic powder is the "shell", and then the coated magnetic powder is passivated. The advantages of the patent of the present invention are: 1. Passivation treatment can be performed after coating a layer of easily passivated magnetic powder on the surface of the difficult-to-passivated magnetic powder, a uniform and dense passivation film can be formed on the surface, and the insulation performance is high. The reliability of electronic components manufactured by magnetic powder is greatly improved; 2. The magnetic permeability, saturation magnetic flux density, coercivity, eddy current loss, and pressing performance of the magnetic powder processed by this process have been improved.

Description

technical field [0001] The invention relates to a new insulation process for hard-to-passivate magnetic powder, which is used for insulation treatment of amorphous / nanocrystalline magnetic powder and hard-to-passivate crystalline magnetic powder containing Ni and Cr, etc., and belongs to the field of powder metallurgy and passive electronic components . Background technique [0002] The iteration of intelligent equipment and the development of communication technology put forward higher requirements for passive electronic components such as transformers and inductors, and thus put forward new requirements for the raw materials for manufacturing electronic components: magnetic powder. Some magnetic powders have superior electromagnetic properties: for example, amorphous / nanocrystalline powders have low loss, and magnetic powders containing Ni and Cr have good rust resistance. However, these magnetic powders are difficult to insulate, resulting in low reliability of passive el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/00H01F41/00
CPCH01F1/00H01F41/00
Inventor 胡庚朱圆圆耿振伟韩仕杰王雪珂
Owner SHENZHEN MICROGATE TECH
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