Method for preparing Fe-B-P ultrafine particles

A technology of ultra-fine particles, fe-b-p, applied in the field of magnetic materials, can solve the problems of large coercive force, achieve low coercive force, high saturation magnetization, and broad application prospects

Active Publication Date: 2011-09-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

How to solve the problem of large coercive force has always been the focus of research

Method used

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  • Method for preparing Fe-B-P ultrafine particles
  • Method for preparing Fe-B-P ultrafine particles
  • Method for preparing Fe-B-P ultrafine particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The steps for preparing Fe-B-P ultrafine particles are as follows.

[0032] (1) At room temperature, using water as a solvent, dissolve the following substances in turn: FeCl 2 4H 2 O, NH 4 Cl, sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) and sodium hypophosphite (NaH 2 PO 2 ·H 2 O).

[0033] In the aqueous solution, the mass percent concentration of the above-mentioned substances is: FeCl 2 4H 2 O22%; NH 4 Cl 11%; sodium citrate (C 6 h5 Na 3 o 7 2H 2 O) 22%; sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 20%.

[0034] (2) Add urea as coating agent in the solution prepared in step (1), and the addition amount is according to coating agent and FeCl 2 4H 2 Molar ratio of O, for encapsulant: FeCl 2 4H 2 O=5:1, so as to control the uniformity of particle size.

[0035] (3) under stirring condition (stirring rate 1800 revs / min), in the solution that step (2) prepares, drop the NaOH solution of 1.8mol / L, the rate of addition is 160ml / h, adjusts the preparation ...

Embodiment 2

[0046] The steps for preparing Fe-B-P ultrafine particles are as follows.

[0047] (1) At room temperature, using water as a solvent, dissolve the following substances in turn: FeCl 2 4H 2 O, NH 4 Cl, sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) and sodium hypophosphite (NaH 2 PO 2 ·H 2 O).

[0048] In the aqueous solution, the mass percent concentration of the above-mentioned substances is: FeCl 2 4H 2 O35%; NH 4 Cl 16%; sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) 16%; sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 15%.

[0049] (2) Add polyvinylpyrrolidone (PVP) to the solution prepared in step (1) as a wrapping agent, and the amount of addition is based on the wrapping agent and FeCl 2 4H 2 Molar ratio of O, for encapsulant: FeCl 2 4H 2 O=10:1, so as to control the uniformity of particle size.

[0050] (3) under stirring condition (stirring speed 500 revs / min), in the solution that step (2) prepares, drop the NaOH solution of 0.5mol / L, the rate of addition is 3...

Embodiment 3

[0061] The steps for preparing Fe-B-P ultrafine particles are as follows.

[0062] (1) At room temperature, using water as a solvent, dissolve the following substances in turn: FeCl 2 4H 2 O, NH 4 Cl, sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) and sodium hypophosphite (NaH 2 PO 2 ·H 2 O).

[0063] In the aqueous solution, the mass percent concentration of the above-mentioned substances is: FeCl 2 4H 2 O 5%; NH 4 Cl 2%; sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) 5%; sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 5%.

[0064] (2) Add polyethylene glycol (PEG) as encapsulating agent in the solution prepared in step (1), and the addition amount is according to encapsulating agent and FeCl 2 4H 2 Molar ratio of O, for encapsulant: FeCl 2 4H 2 O=0.25:1, so as to control the size uniformity of the particles.

[0065] (3) under stirring condition (stirring rate 50 revs / min), in the solution that step (2) prepares, drop the NaOH solution of 3mol / L, rate of addition is 2...

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Abstract

The invention relates to a method for preparing Fe-B-P ultrafine particles, comprising the following steps: dissolving FeCl2.4H2O, NH4Cl, sodium citrate and sodium hypophosphite to water functioning as solvent in room temperature; adding package agent to the solution; dropwise adding NaOH solution to adjusting the pH value of the solution; dropwise adding sodium borohydride solution to obtain theblack Fe-B-P ultrafine particle suspension; centrifugally separating the black Fe-B-P ultrafine particle suspension to obtain the Fe-P-B ultrafine particles; and collecting the Fe-P-B ultrafine particles, washing with water, washing with ethanol and placing into ethanol. The sub-micron / nanometer ultrafine powder material has high saturation magnetization and low coercive force, is good soft magnetic material and has wide application prospect in numerous fields of the magnetic fluid, the electromagnetic wave absorbing material, the DC-DC converter, the targeting drugs and the like.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a method for preparing Fe-based soft magnetic materials. Background technique [0002] Fe-based soft magnetic materials have high saturation magnetization and low coercive force, and are currently widely used. With the development of science and technology, submicron and nanometer materials have gradually entered the stage of material application. When the material is made into the submicron and nanometer range, it will reveal many characteristics different from bulk materials, such as: small size effect, surface effect, tunnel effect and even quantum effect and so on. For soft magnetic materials, high permeability and saturation magnetization, low coercive force and magnetic loss are generally required. Metal soft magnetic materials are the earliest soft magnetic materials used, but due to the low resistivity of metals (about 10 -6 -10 -5 Ωcm), it will...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01F1/14B22F9/24
Inventor秦高梧裴文利姚骋李松任玉平左良
OwnerNORTHEASTERN UNIV LIAONING