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A kind of preparation method of high coercive force hexagonal strontium ferrite

A technology of strontium ferrite and high coercivity, applied in the field of preparation of high coercivity hexagonal strontium ferrite, can solve problems such as limitations, achieve good size, significant increase in coercivity, and good magnetic properties Effect

Active Publication Date: 2017-03-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the ceramic sintering method is widely used in industry, this preparation method has great limitations in industrial applications.

Method used

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  • A kind of preparation method of high coercive force hexagonal strontium ferrite
  • A kind of preparation method of high coercive force hexagonal strontium ferrite
  • A kind of preparation method of high coercive force hexagonal strontium ferrite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of a high coercive force hexagonal strontium ferrite in this embodiment, the specific preparation steps are as follows:

[0043] (1) Al 2 o 3 Added to the primary calcined material of strontium ferrite (SrFe 12 o 19 ), according to the stoichiometric formula SrFe 11.8 Al 0.2 o 19 Carry out mixing, and add the CaCO of above-mentioned mixed material gross mass 0.8% 3 , 0.2% SiO 2 , 0.3% H 3 BO 3 And 0.6% calcium gluconate, then place in planetary ball mill and carry out wet grinding to obtain slurry, the concrete condition of wet grinding is: use the hard steel ball that diameter is 6mm, press 8:1:1.5 ball, material, Water is mixed in proportion to carry out ball milling, the ball milling speed is 300r / min, and the ball milling time is 4 hours;

[0044] (2) hang the slurry with a filter cloth until the moisture content is between 20% and 25%, and then place it under a wet pressure magnetic field forming press to form a round billet with a ...

Embodiment 2

[0052] The preparation method of a high coercive force hexagonal strontium ferrite in this embodiment, the specific preparation steps are as follows:

[0053] (1) Al 2o 3 Added to the primary calcined material of strontium ferrite (SrFe 12 o 19 ), according to the stoichiometric formula SrFe 11.8 al 0.2 o 19 Carry out mixing, and add the CaCO of above-mentioned mixed material gross mass 0.8% 3 , 0.2% SiO 2 , 0.3% H 3 BO 3 And 0.6% calcium gluconate, then place in planetary ball mill and carry out wet grinding to obtain slurry, the concrete condition of wet grinding is: use the hard steel ball that diameter is 6mm, press 8:1:1.5 ball, material, Water is mixed in proportion to carry out ball milling, the ball milling speed is 300r / min, and the ball milling time is 4 hours;

[0054] (2) hang the slurry with a filter cloth until the moisture content is between 20% and 25%, and then place it under a wet pressure magnetic field forming press to form a round billet with a d...

Embodiment 3

[0060] The preparation method of a high coercive force hexagonal strontium ferrite in this embodiment, the specific preparation steps are as follows:

[0061] (1) Al 2 o 3 Added to the primary calcined material of strontium ferrite (SrFe 12 o 19 ), adjust the doping amount of Al ions according to the stoichiometric formula SrFe 11.9 al 0.1 o 19 , SrFe 11.8 al 0.2 o 19 , SrFe 11.7 al 0.3 o 19 , SrFe 11.6 al 0.4 o 19 , SrFe 11.5 al 0.5 o 19 , SrFe 11.4 al 0.6 o 19 and SrFe 11.3 al 0.7 o 19 Carry out mixing, and add the CaCO of above-mentioned mixed material gross mass 0.8% 3 , 0.2% SiO 2 , 0.3% H 3 BO 3 And 0.6% calcium gluconate, then place in planetary ball mill and carry out wet grinding to obtain slurry, the concrete condition of wet grinding is: use the hard steel ball that diameter is 6mm, press 8:1:1.5 ball, material, Water is mixed in proportion to carry out ball milling, the ball milling speed is 300r / min, and the ball milling time is 4 hours;...

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Abstract

The present invention belongs to the technical field of magnetic materials, and discloses a preparation method for hexagonal strontium ferrite with high coercivity. The preparation method comprises the following steps of: (1) adding Al2O3 into a primary pre-sintering material SrFe12O19 of strontium ferrite, after mixing the material, putting the mixed material into a planetary ball mill and performing wet-milling on the material to obtain slurry; (2) carrying out hang-drying on the slurry by use of filter cloth until water content of the slurry is 20%-25%, then putting the slurry into a wet-pressure magnetic field molding press to carry out pressing and molding, thereby obtaining blank; and (3) putting the blank into sintering equipment and raising the temperature of the blank to a sintering temperature of 1190-1290 DEG C to carry out sintering, after preserving the temperature for 30-120 minutes, cooling the blank to obtain the hexagonal strontium ferrite with high coercivity. The preparation method disclosed by the invention is free of rare earth addition and low in cost, and has characteristics of a simple operated process, easy-to-control adding amount, short preparation time, and the like; and by virtue of optimization of the preparation process, the obtained strontium ferrite has a good magnetic property.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a preparation method of high coercivity hexagonal strontium ferrite. Background technique [0002] Hexagonal strontium ferrite is currently the largest type of permanent magnet material. It has been widely used in electroacoustic devices, Automation equipment, speakers, weather monitoring, communication components, micro motors, chemical equipment, agricultural breeding, motor vehicle starting motors, computer systems, electric bicycles, military instruments, marine detection and other fields. However, its remanence, coercive force and magnetic energy product are much lower than those of rare earth permanent magnet materials, thus limiting the application fields of strontium ferrite. The main ways to improve the magnetic properties of strontium ferrite are to improve the preparation process and ion doping. Through a lot of research, it is found that the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 曾德长李程聪郑志刚余红雅王刚
Owner SOUTH CHINA UNIV OF TECH