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Characterization analysis method for migration of lanthanum and cobalt ions in lanthanum-cobalt substituted strontium ferrite permanent magnet material

A technology of strontium ferrite and permanent magnet materials, applied in the field of materials science, can solve the problems of little research on the law of ion migration

Inactive Publication Date: 2013-11-27
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most researchers focus on the effect of ion substitution on the magnetic properties of strontium ferrite permanent magnet materials, but there is little research on the law of ion migration during ion substitution

Method used

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  • Characterization analysis method for migration of lanthanum and cobalt ions in lanthanum-cobalt substituted strontium ferrite permanent magnet material
  • Characterization analysis method for migration of lanthanum and cobalt ions in lanthanum-cobalt substituted strontium ferrite permanent magnet material
  • Characterization analysis method for migration of lanthanum and cobalt ions in lanthanum-cobalt substituted strontium ferrite permanent magnet material

Examples

Experimental program
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Effect test

preparation example Construction

[0040] Preparation of XRF test samples: sand it flat with sandpaper, rinse the surface with absolute alcohol, and keep it dry and pollution-free.

[0041] The X-ray fluorescence spectrometer (XRF) used in the examples is the XRF-1800 type from Shimadzu Corporation of Japan.

Embodiment 1

[0043] A method for characterizing and analyzing ion migration in a lanthanum-cobalt substituted strontium ferrite permanent magnet material, comprising the following steps:

[0044] (1) The ferrite calcined material containing strontium is mixed with the secondary additives without lanthanum and cobalt in a ball mill. After wet ball milling, the average particle size of the slurry reaches 0.9 μm. After passing the dehydration and separation, it is required that after dehydration The moisture content of the slurry is 35%;

[0045] The chemical formula of the strontium ferrite calcined material is SrFe 12 o l9 ;

[0046] The auxiliary agent added for the second time without lanthanum cobalt is made of Al 2 o 3 , CaCO 3 , SiO 2 and H 3 BO 3 Composition, the mass ratio of strontium ferrite calcined material to secondary additives without lanthanum and cobalt is 1:0.027;

[0047] (2) The ferrite calcined material containing strontium and the secondary additive containing ...

Embodiment 2

[0056] A method for characterizing and analyzing ion migration in a lanthanum-cobalt substituted strontium ferrite permanent magnet material, comprising the following steps:

[0057] (1) The ferrite calcined material containing strontium is mixed with the secondary additives without lanthanum and cobalt in a ball mill. After wet ball milling, the average particle size of the slurry reaches 0.8 μm. After passing the standard, it is dehydrated and separated, and after dehydration is required The moisture content of the slurry is 30%;

[0058] The chemical formula of the strontium ferrite calcined material is SrFe 12 o l9 ;

[0059] The auxiliary agent added for the second time without lanthanum cobalt is made of Al 2 o 3 , CaCO 3 , SiO 2 and H 3 BO 3 Composition, the mass ratio of strontium ferrite calcined material to secondary additives without lanthanum and cobalt is 1:0.027;

[0060] (2) The ferrite calcined material containing strontium and the secondary additive c...

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Abstract

The invention provides a characterization analysis method for migration of lanthanum and cobalt ions in a lanthanum-cobalt substituted strontium ferrite permanent magnet material. The method comprises the following steps: mixing a strontium-containing ferrite pre-sintering material with a secondarily added auxiliary agent containing lanthanum and cobalt and with a secondarily added auxiliary agent not containing lanthanum and cobalt in a ball mill, respectively and subjecting obtained mixtures to ball milling in the ball mill; preparing a circular green body from separated and dehydrated slurry not containing lanthanum and cobalt through wet molding, then taking the green body out, adding slurry containing lanthanum and cobalt in a press groove, placing the compacted green body above the slurry containing lanthanum and cobalt, carrying out compaction to prepare a mixed circular green body, allowing the molded green body to enter into a tunnel furnace and carrying out sintering according to a certain process system so as to obtain a sintered mixed strontium ferrite permanent magnet material; polishing the surface of a sample from top to bottom layer by layer so as to remove 1 to 2 mm of the sample and analyzing the surface by using an X-ray fluorescent spectrum analyzer so as to obtain the content of elemental lanthanum and elemental cobalt in a plurality of surfaces; and finally drafting a diagram showing changes of the content of elemental lanthanum and elemental cobalt with migration distance so as to visually display migration of lanthanum and cobalt ions in the strontium ferrite permanent magnet material.

Description

technical field [0001] The invention belongs to the field of materials science, and in particular relates to a lanthanum-cobalt-substituted strontium ferrite magnetic material, in particular to a method for characterizing and analyzing the migration of lanthanum-cobalt ions in the lanthanum-cobalt-substituted strontium ferrite permanent magnet material. [0002] Background technique [0003] M-type hexagonal ferrite is composed of several oxides with ferric ions as the main cation component. It is widely used because of its high cost performance, suitable magnetic properties and high chemical stability. With the rapid development of domestic and foreign economies, the demand for the output of ferrite is increasing, and the performance requirements are getting higher and higher. The improvement of the magnetic properties of ferrite starts from two aspects: first, in terms of technology, the magnetic properties are improved by optimizing the process parameters such as the bal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 孙延杰王占勇金双玲金鸣林
Owner SHANGHAI INST OF TECH
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