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Preparation method of highly-oriented strontium ferrite

A strontium ferrite, high-orientation technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., to achieve good dispersion and uniform size distribution

Inactive Publication Date: 2017-05-31
彭晓领
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it cannot be guaranteed that each crushed particle is a single crystal, the crystallographic easy axes of most of the oriented particles are not in the direction of the external magnetic field.

Method used

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  • Preparation method of highly-oriented strontium ferrite
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  • Preparation method of highly-oriented strontium ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The specific steps are:

[0043] 1) Hydrothermal synthesis of strontium ferrite hexagonal sheets

[0044] with SrCl 2 ·6H 2 O, FeCl 3 ·6H 2 O and NaOH are used as raw materials, the ratio of Fe / Sr is controlled to be 3:1, the hydrothermal temperature is 160°C, and the synthesis time is 36h. After filtering, washing and drying, hexagonal flaky strontium ferrite particles are obtained;

[0045] 2) Preparation of composite system

[0046] Stir and disperse 100 parts of epoxy resin and 20 parts of strontium ferrite hexagonal sheet at 20°C for 0.5h, then add 1 part of curing agent diethylenetriamine, and continue stirring for 30s;

[0047] 3) Orientation of magnetic particles in a magnetic field

[0048] Inject the dispersion composite system into the mold, and then apply a magnetic field at the mold, the magnetic field strength is 0.01 T, and the orientation time is 60 minutes, so that the strontium ferrite hexagonal sheet is rotated to the direction of the sheet perpen...

Embodiment 2

[0053] The specific steps are:

[0054] 1) Hydrothermal synthesis of strontium ferrite hexagonal sheets

[0055] with SrCl 2 ·6H 2 O, FeCl 3 ·6H 2 O and NaOH were used as raw materials, the Fe / Sr ratio was controlled to be 6:1, the hydrothermal temperature was 180°C, and the synthesis time was 18 hours. After filtering, washing, and drying, hexagonal flaky strontium ferrite particles were obtained;

[0056] 2) Preparation of composite system

[0057] Stir and disperse 100 parts of epoxy resin and 50 parts of strontium ferrite hexagonal sheet at 40°C for 1 hour, then add 2 parts of curing agent diethylenetriamine, and continue stirring for 30 seconds;

[0058] 3) Orientation of magnetic particles in a magnetic field

[0059] Inject the dispersion composite system into the mold, and then apply a magnetic field at the mold, the magnetic field strength is 0.1 T, and the orientation time is 30 minutes, so that the strontium ferrite hexagonal sheet is rotated to the direction ...

Embodiment 3

[0064] The specific steps are:

[0065] 1) Hydrothermal synthesis of strontium ferrite hexagonal sheets

[0066] with SrCl 2 ·6H 2 O, FeCl 3 ·6H 2 O and NaOH are used as raw materials, the Fe / Sr ratio is controlled to be 8:1, the hydrothermal temperature is 200°C, and the synthesis time is 8h. After filtering, washing, and drying, hexagonal flaky strontium ferrite particles are obtained;

[0067] 2) Preparation of composite system

[0068] Stir and disperse 100 parts of epoxy resin and 100 parts of strontium ferrite hexagonal sheet at 60°C for 2 hours, then add 5 parts of curing agent diethylenetriamine, and continue stirring for 30 seconds;

[0069] 3) Orientation of magnetic particles in a magnetic field

[0070] Inject the dispersion composite system into the mold, and then apply a magnetic field at the mold, the magnetic field strength is 0.3 T, and the orientation time is 10 minutes, so that the strontium ferrite hexagonal sheet is rotated to the direction of the sh...

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Abstract

The invention relates to a preparation method of a highly-oriented strontium ferrite. The method includes the steps of: 1) with SrCl2.6H2O, FeCl3.6H2O and NaOH as raw materials, regulating hydrothermal condition to prepare hexagonal sheet-shaped strontium ferrite particles; 2) uniformly mixing the strontium ferrite particles and epoxy resin to prepare a compound system and injecting the compound system into a mould; 3) placing the mould in a magnetic field so that the hexagonal sheet-shaped strontium ferrite in the mould rotates until the lamella is vertical to the direction of the magnetic field, thereby presenting a typical anisotropic structure and further generating anisotropic magnetic character. The hexagonal sheet-shaped strontium ferrite particle is prepared hydrothermally and has good dispersibility and uniform size distribution. The particle is a single crystal or is like a single crystal, wherein the easy axis of the particle is vertical to the lamella direction. After orientation in the magnetic field, the hexagonal sheet-shaped strontium ferrite particle rotates until the lamella is vertical to the direction of the magnetic field, so that a completely oriented structure is formed and typical anisotropic magnetic performances are generated.

Description

technical field [0001] The invention relates to a preparation method of highly oriented strontium ferrite, which belongs to the field of material preparation. Background technique [0002] Magnetic materials are a wide range of functional materials. Generally, we think that magnetic materials are composed of iron, cobalt, nickel transition elements and their compounds, which can directly or indirectly generate magnetism. Magnetic materials are important materials used in people's livelihood and high-tech industries. From the perspective of the development of magnetic materials, the overall development trend can be summarized as follows: before the 1950s, metallic magnetic materials dominated, and after the 1950s, non-metallic magnetic materials dominated, and ferrite materials were used in almost every field. In terms of the preparation process of magnetic materials, the development of magnetic materials has developed from metallurgy to powder metallurgy and ceramic technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/0036C01P2002/72C01P2004/03C01P2006/42
Inventor 彭晓领张敖李静杨艳婷徐靖才王攀峰金红晓洪波金顶峰葛洪良王新庆
Owner 彭晓领
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