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Method for preparing Ni-Fe/Fe compound powder film with high magnetic conductivity

A technology of composite powder and high magnetic permeability, applied in the field of materials, can solve the problems of difficulty in preparing particle gaps, affecting the magnetic permeability of magnetic powder, and high bulk density, and achieve high saturation magnetization and high magnetic permeability. , the effect of low coercive force

Inactive Publication Date: 2010-05-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively large particle size and the relatively large gaps between powder particles, it is difficult to prepare powder materials with small particle gaps and high bulk density, which will affect the magnetic permeability of magnetic powder, especially at 100MHz ~ 1GHz Permeability of the band

Method used

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  • Method for preparing Ni-Fe/Fe compound powder film with high magnetic conductivity
  • Method for preparing Ni-Fe/Fe compound powder film with high magnetic conductivity
  • Method for preparing Ni-Fe/Fe compound powder film with high magnetic conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] FeCl 2 and NiCl 2 Added to ethylene glycol, FeCl 2 The molar concentration is 0.1M, NiCl 2 The molar concentration of the solution is 0.1M, the NaOH solution is added dropwise to adjust the pH value to 7, and the concentration of the NaOH solution is 0.5M. Heat and stir at 80±5°C until the iron salt and nickel salt are completely dissolved in ethylene glycol to obtain a mixed alcohol solution.

[0037] Heat the mixed alcohol solution to 150°C and keep it warm for 180min to obtain a suspension.

[0038] Cool the suspension to room temperature, put it in a centrifuge tube, and centrifuge at a speed of 5000 rpm. The microparticles are attached to the wall of the centrifuge tube under the action of gravity and centrifugal force, and the liquid phase is poured out to obtain a solid phase of Ni-Fe. Fine particles; the average particle diameter of the Ni-Fe fine particles is 440 nm.

[0039]Wash the Ni-Fe microparticles with water to remove residual ethylene glycol, then ...

Embodiment 2

[0043] Fe(acac) 2 and Ni(acac) 2 Added to ethylene glycol, Fe(acac) 2 The molar concentration of Ni(acac)2 is 0.5M, and the molar concentration of Ni(acac)2 is 0.5M. NaOH solution is added dropwise to adjust the pH value to 8, and the concentration of NaOH solution is 1M. Stir under the condition that the heating temperature is 80±5°C until the iron salt and the nickel salt are completely dissolved in ethylene glycol to obtain a mixed alcohol solution.

[0044] Add K to the mixed alcohol solution 2 PtCl 4 As a nucleating agent, the molar ratio of the Pt ions in the nucleating agent to the Ni ions and Fe ions in the mixed alcohol solution is Pt: (Ni+Fe)=1×10 -4 : 1, then heated to 160° C., kept for 150 minutes, and synthesized to obtain a suspension.

[0045] Cool the suspension to room temperature, place it in a centrifuge tube, and centrifuge at a speed of 6000rpm. The microparticles are attached to the wall of the centrifuge tube under the action of gravity and centrifu...

Embodiment 3

[0050] FeCl 2 and NiCl 2 Added to ethylene glycol, FeCl 2 The molar concentration is 0.2M, NiCl 2 The molar concentration of the solution is 0.2M, the NaOH solution is added dropwise to adjust the pH value to 9, and the concentration of the NaOH solution is 2M. Stir under the condition that the heating temperature is 80±5°C until the iron salt and the nickel salt are completely dissolved in ethylene glycol to obtain a mixed alcohol solution.

[0051] Add K to the mixed alcohol solution 2 PtCl 4 As a nucleating agent, the molar ratio of the Pt ions in the nucleating agent to the Ni ions and Fe ions in the mixed alcohol solution is Pt: (Ni+Fe)=1×10 -5 : 1, then heated to 180° C., kept for 120 minutes, and synthesized to obtain a suspension.

[0052] Cool the suspension to room temperature, place it in a centrifuge tube, and centrifuge at a rotation speed of 5000 rpm. The microparticles are attached to the wall of the centrifuge tube under the action of gravity and centrifu...

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Abstract

The invention provides a method for preparing Ni-Fe / Fe compound powder film with high magnetic conductivity. The method comprises the following steps of: adding iron salt and nickel salt to ethylene glycol, adjusting the pH value, heating and stirring the solution till the iron salt and the nickel salt dissolve completely, adding K2PtCl14, heating the mixed solution to the temperature of between 150 and 200 DEG C, keeping temperature constant for 30 to 180 minutes to perform synthesis reaction to obtain suspended solution, cooling the suspended solution to the room temperature, centrifuging the suspended solution and removing liquid phase to obtain a solid phase which is Ni-Fe micro particles; and mixing the Ni-Fe micro particles and micro-level Fe powder to obtain the compound magnetic powder. The compound magnetic powder is coated on a basal body, the basal body coated with the compound magnetic powder is applied with magnetic fields and dried, and the compound magnetic powder film is obtained on the basal body, wherein the thickness of the film is 10 to 1,000 mu m. The synthesis method has the advantages that: the method is simple and easy to operate, non-poisonous and harmless, and does not cause environmental pollution; the obtained Ni-Fe / Fe compound magnetic powder film possesses high saturation magnetization, low coercive force and controllable magnetic conductivity, is a good type of soft magnetic materials and has wide application prospect in fields such as high-frequency electromagnetic noise inhibition of an integrated circuit, design of a DC-DC converter, wave-absorbing materials and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing a Ni-Fe / Fe composite powder film with high magnetic permeability. Background technique [0002] Fe-based soft magnetic materials, such as Ni-Fe Permalloy, have high saturation magnetization, magnetic permeability and low coercive force, and have been widely used at present. However, due to the low resistivity of metals (about 10 -6 ~10 -5 Ωcm), it will produce significant eddy current loss when applied to high frequency. By reducing the particle size and preparing nanometer and submicron size powder materials, this loss effect can be effectively reduced. Therefore, in recent years, researchers have prepared Fe-based soft magnetic materials into submicron and nanoscale particles. This ultrafine powder exhibits many excellent properties, so it has broad application prospects in many fields such as magnetic fluids, wave-absorbing materials, electromagnet...

Claims

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Application Information

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IPC IPC(8): H01F10/14H01F41/14B22F9/24C23C24/08
Inventor 秦高梧裴文利李松任玉平左良
Owner NORTHEASTERN UNIV
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