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Preparation method of coated carbonyl iron powder

A technology of carbonyl iron powder and coated type, which is applied in the field of preparation of coated carbonyl iron powder, can solve the problems that the insulating layer has no high temperature resistance, cannot withstand heat treatment, and the coating layer has a single insulating layer, so as to achieve good high temperature resistance Performance, improve the effect of heat treatment temperature is too low

Inactive Publication Date: 2013-04-17
CHINA IRON & STEEL RES INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the cladding layers obtained by the above technologies are single insulating layers, and these insulating layers do not have good high temperature resistance (generally not exceeding 500°C), and cannot withstand heat treatment at higher temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material iron powder is high-purity carbonyl iron powder with an average particle size of 1 micron, and its concentration is controlled at 2 g / ml. A certain amount of zinc-iron phosphate, phosphoric acid, hexafluorotitanic acid and deionized water are added to ethanol to form an acidic treatment solution. Control the concentration of phosphate to 0.02g / ml, the concentration of phosphoric acid to 0.05g / ml, the concentration of hexafluorotitanic acid to 0.002g / ml, and the volume fraction of deionized water to 5%. Add the iron powder into the acidic treatment liquid and stir it mechanically at 70°C for 5 minutes, filter and wash with absolute ethanol for 3 times, and dry it fully at 80°C. A certain amount of magnesium ethylate was added to the mixed solution of ethanol and deionized water for hydrolysis, and a certain amount of ammonia was added as a catalyst to prepare the sol. Control the concentration of magnesium ethoxide to 0.2 g / ml, the concentration of ammo...

Embodiment 2

[0027] The raw material iron powder is high-purity carbonyl iron powder with an average particle size of 3 microns, and its concentration is controlled to be 0.1 g / ml. A certain amount of zinc-iron phosphate, phosphoric acid, hexafluorotitanic acid and deionized water are added to ethanol to form an acidic treatment solution. The concentration of phosphate is controlled to be 0.5g / ml, the concentration of phosphoric acid is 0.002g / ml, the concentration of hexafluorotitanic acid is 0.002g / ml, and the volume fraction of deionized water is 15%. Heat the treatment solution in a water bath to 50°C, add iron powder into the acidic treatment solution and mechanically stir for 30 minutes, filter and wash with absolute ethanol for 3 times, then place it at 80°C to fully dry. A certain amount of magnesium ethoxide is added to a mixed solution of ethanol and deionized water for hydrolysis, and a certain amount of ammonia water is added as a catalyst to prepare a sol. Control the concent...

Embodiment 3

[0029]The raw material iron powder is high-purity carbonyl iron powder with an average particle size of 5 microns, and its concentration is controlled at 1 g / ml. A certain amount of zinc-iron phosphate, phosphoric acid, hexafluorotitanic acid and deionized water are added to ethanol to form an acidic treatment solution. The concentration of phosphate is controlled to be 0.1g / ml, the concentration of phosphoric acid is 0.01g / ml, the concentration of hexafluorotitanic acid is 0.05g / ml, and the volume fraction of deionized water is 10%. Add the iron powder into the acidic treatment solution at room temperature (20°C) and mechanically stir for 60 minutes, filter and wash with absolute ethanol for 3 times, and then place it at 80°C to fully dry. A certain amount of magnesium ethoxide is added to a mixed solution of ethanol and deionized water for hydrolysis, and a certain amount of ammonia water is added as a catalyst to prepare a sol. Control the concentration of magnesium ethoxi...

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Abstract

A preparation method of coated carbonyl iron powder belongs to the technical field of magnetic functional materials prepared by powder metallurgy. The process steps are as follows: firstly, placing carbonyl iron powder into an acidic conditioning fluid, stirring for 5-60 min at the temperature of 20-70 DEG C, filtering, washing and drying; then placing the mixture in a magnesium ethoxide conditioning fluid, stirring for 30-120 min at the temperature of 50-120 DEG C by adopting the sol-gel method, filtering and washing; and finally drying the newly obtained mixture at 50-120 DEG C to obtain composite carbonyl iron powder coated by a phosphate layer and a magnesium oxide layer. The preparation method has the advantages that the prepared phosphate and magnesium oxide films can improve the material resistivity, play an insulating role and greatly lower the magnetic loss of soft magnetic powder cores; and the insulating films have better high-temperature resistance and can bear heat treatment at the temperature of 550 DEG C without damage.

Description

technical field [0001] The invention belongs to the technical field of preparing magnetic functional materials by powder metallurgy, in particular to a preparation method of coated carbonyl iron powder. Background technique [0002] Carbonyl iron powder is an onion layer structure powder with an average particle size of about 1-10 microns produced by thermal decomposition of pentacarbonyl iron. It has high purity, high activity, and high magnetic flux rate at high frequency and ultrahigh frequency. , is also widely used in the manufacture of magnetic materials, and plays an irreplaceable role in the manufacture of high-frequency iron powder cores. Especially for high-quality factor high-permeability low-loss soft magnetic materials at high frequencies, high-frequency surface mount (SMD) and anti-electromagnetic interference (EMI) components, etc., with low cost, good reliability and easy molding process Etc. [0003] Electronic components prepared with carbonyl iron powder...

Claims

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Application Information

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IPC IPC(8): C23C20/08C01G49/16
Inventor 李一唐思琪李发长张贵臣柳学全刘文兴李楠杨波霍静李金普孟溟灏
Owner CHINA IRON & STEEL RES INST GRP
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