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Composite soft magnetic metal powder, preparation method and integrally-formed inductor

A metal powder, composite soft magnetic technology, applied in metal processing equipment, inductance/transformer/magnet manufacturing, circuits, etc., can solve the problems of sacrificing integrated inductance magnetic

Inactive Publication Date: 2019-08-30
HEFEI ECRIEE TAMURA ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods for improving the withstand voltage characteristics of soft magnetic powders and improving the high-voltage resistance of integrated inductors almost all sacrifice the magnetic properties of integrated inductors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The invention provides a method for preparing composite soft magnetic metal powder, comprising the following steps:

[0029] Step S1, passivation treatment: the soft magnetic metal powder is placed in a phosphorus-containing solution for phosphating reaction, so that a phosphating film is formed on the surface of the soft magnetic metal powder, then filtered, dried, and set aside;

[0030] Step S2, preparing a coating agent: adding rare earth oxides to the adhesive, mixing evenly and then setting aside;

[0031] Step S3, adding the soft magnetic metal powder obtained in step S1 to the coating agent obtained in step S2, and mixing evenly;

[0032] Step S4, granulating and drying the mixture obtained in step S3;

[0033] Step S5, adding a lubricant to the particles obtained in step S4, and mixing uniformly to obtain the composite soft magnetic metal powder.

[0034] Wherein, the soft magnetic metal powder is carbonyl iron powder or iron-silicon-chromium alloy powder; th...

Embodiment 1

[0038] Step S1. Soak the carbonyl iron powder in a zinc-based phosphating solution with a mass fraction of 0.5% until a phosphating film is formed on the surface of the carbonyl iron powder, filter off the liquid, and dry the solid in a draft oven. The temperature is 150°C, and the baking time is 120 minutes, then take it out and let it dry for later use.

[0039] Step S2, adding samarium oxide powder and absolute ethanol to the phenolic resin, followed by stirring in a water bath at 40°C to obtain a uniform mixed coating agent, which is ready for use.

[0040] In this step, the amount of samarium oxide is 2% of the mass of carbonyl iron powder, the volume ratio of phenolic resin to absolute ethanol is 1:5, and the amount of phenolic resin is equivalent to that of conventional methods.

[0041] Step S3, adding the solid obtained in step S1 to the coating agent obtained in step S2, stirring evenly, and then granulating to obtain wet powder.

[0042] Step S4, put the wet powder...

Embodiment 2

[0047] Step S1, soak the carbonyl iron powder in a zinc-based phosphating solution with a mass fraction of 1.5% to form a phosphating film on the surface of the carbonyl iron powder, filter off the liquid, dry the solid in a draft oven, and bake The temperature is 150°C, and the baking time is 120 minutes, then take it out and let it dry for later use.

[0048] Step S2, adding cerium oxide powder and acetone to the phenolic resin, followed by stirring in a water bath at 45°C to obtain a uniform mixed coating agent, which is ready for use.

[0049] In this step, the consumption of described cerium oxide is 5% of carbonyl iron powder quality, diluent is dehydrated alcohol, and the consumption volume ratio of phenolic resin and dehydrated alcohol is 1: 3, the consumption of phenolic resin and conventional method consumption quite.

[0050] Step S3, adding the solid obtained in step S1 to the coating agent obtained in step S2, stirring evenly, and then granulating to obtain wet p...

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Abstract

The invention discloses composite soft magnetic metal powder, a preparation method and an integrally-formed inductor. The preparation method of the composite soft magnetic metal powder comprises the following steps of performing passivation treatment, preparing a coating agent, coating the soft magnetic metal powder, granulating, and adding a lubricant. The preparation method of the composite softmagnetic metal powder has the advantages that the high pressure impact resistance of the soft magnetic composite metal powder is greatly improved by adding rare earth oxide into the soft magnetic composite metal powder, so that the performance of the integrally-formed inductor is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic component manufacturing, and in particular relates to a composite soft magnetic metal powder, a preparation method and an integrally formed inductor. Background technique [0002] The one-piece inductor is used in the circuit to perform the functions of filtering, energy storage and voltage conversion. It includes a seat body and a winding body. The seat system is formed by die-casting the winding body embedded in soft magnetic metal powder. Electrode pins are formed on the surface of the body. During the working process of the circuit, instantaneous high voltage or high voltage conversion will inevitably occur, which will cause an impact on the integrally formed inductor, and then cause leakage, and what is more, it will cause damage to the entire circuit. [0003] In view of this, how to improve the withstand voltage characteristics of integrally formed inductors has become an urgent problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/02H01F1/20H01F41/02
CPCH01F1/20H01F41/0246B22F1/10B22F1/16B22F1/145
Inventor 钱小龙张磊李伟健万静龙张德光刘国安
Owner HEFEI ECRIEE TAMURA ELECTRIC
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