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Preparation method of core-shell soft magnetic composite

A soft magnetic composite material, core-shell technology, applied in the direction of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problems of affecting magnetic loss, difficult coating, and affecting coating effect, etc.

Inactive Publication Date: 2018-09-28
HAIAN INST OF HIGH TECH RES NANJING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The direct mixing between alloy powder and ferrite powder is difficult to form a complete coating, which affects the coating effect and then affects the reduction of magnetic loss. Therefore, to further reduce the loss of magnetic powder core, it is necessary to make the ferrite coating agent more Uniform, so that it completely covers the surface of the alloy powder

Method used

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Effect test

Embodiment 1

[0030] 1) Preliminary preparation, select manganese-zinc ferrite, and the coating amount, that is, the mass ratio of manganese-zinc ferrite to magnetic metal powder, is set to 5%, and the molar mass ratio of metal elements in manganese-zinc ferrite is Fe. : Zn:Mn=2:0.5:0.5, prepare magnetic metal powder of corresponding mass according to the above requirements, and configure chloride salt solution containing Fe, Zn, Mn of corresponding molar mass, magnetic metal powder adopts Fe-Ni powder, particle size 40-50μm.

[0031] 2) Passivation treatment: Add Fe-Ni powder to the passivating agent, stir evenly, wash 4 times with deionized water after 15 minutes, and then put it into a vacuum drying oven to dry. The passivating agent includes phosphate acetone solution, sulfuric acid solution and Phosphoric acid solution, the mass fraction of phosphate acetone in the phosphoric acid acetone solution is 4%, the mass fraction of sulfuric acid in the sulfuric acid solution is 2%, and the ma...

Embodiment 2

[0035] 1) In the preliminary preparation, nickel-zinc ferrite is selected, and the coating amount, that is, the mass ratio of the nickel-zinc ferrite to the magnetic metal powder, is set to 5%, and the molar mass ratio of the metal elements in the nickel-zinc ferrite is Fe. : Zn:Ni=2:0.4:0.6, prepare magnetic metal powder of corresponding mass according to the above requirements, and configure the sulfate solution containing Fe, Zn, Ni of corresponding molar mass, magnetic metal powder adopts Fe-Ni powder, particle size 40-50μm.

[0036]2) Passivation treatment: Add Fe-Ni powder to the passivating agent, stir evenly, wash 4 times with deionized water after 15 minutes, and then put it into a vacuum drying oven to dry. The passivating agent includes phosphate acetone solution, sulfuric acid solution and Phosphoric acid solution, the mass fraction of phosphate acetone in the phosphoric acid acetone solution is 3%, the mass fraction of sulfuric acid in the sulfuric acid solution i...

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Abstract

The invention discloses a preparation method of a core-shell soft magnetic composite. The preparation method comprises the following steps of S1. preparing quantitative magnetic metal powder; S2. determining corresponding molar mass of a required metal element Mn or Ni, Fe and Zn according to a wrapping amount of a required Mn-Zn ferrite or Ni-Zn ferrite, and preparing a metal salt solution of thecorresponding molar mass; S3. adding deionized water to the magnetic metal powder of S1 and stirring, and heating to 30-80DEG C; S4. slowly dripping the metal salt solution of S2, stirring and dripping a precipitant at the same time, controlling pH at 9-11, reacting for 30-60 minutes to obtain alloy magnetic powder; S5. washing and drying the alloy magnetic powder; S6. sintering the dried alloy magnetic powder for 1-3 hours at 500-700DEG C, so as to obtain core-shell particles; and S7. pressing the core-shell particles at 1400Mpa at room temperature so as to obtain magnetic cores, and sintering for 1 hour at 600DEG C so as to obtain the core-shell soft magnetic composite. The prepared core-shell soft magnetic composite has good performance.

Description

technical field [0001] The present application relates to the technical field of soft magnetic materials and powder metallurgy, and in particular, to a preparation method of a core-shell soft magnetic composite material. Background technique [0002] With the rapid development of microelectronic technology and magnetoelectronic devices, the development of magnetic core materials with excellent magnetic properties has become one of the key issues to be solved in this field. Soft magnetic materials are widely used in transformers, motors and instruments. Among various magnetic materials, metal materials have the characteristics of high saturation magnetic induction and permeability, and low power loss. However, the high frequency eddy current loss of metal materials limits its application in high frequency fields. In contrast, ferrites have lower saturation induction but can be used at higher frequencies due to their high resistivity. By insulating the surface of the metal ...

Claims

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Application Information

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IPC IPC(8): H01F1/33H01F41/02
CPCH01F1/33H01F41/0246
Inventor 雷成龙涂巍巍唐红哲唐少龙都有为
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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