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Method for preparing cobalt ferrite super fine powder at low temperature

A technology of cobalt ferrite and ultrafine powder, applied in the field of material science, can solve the problems of strict equipment requirements and high energy consumption, and achieve the effects of good grain development, low preparation cost and convenient operation.

Inactive Publication Date: 2008-04-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method consumes a lot of energy and has strict requirements on equipment, otherwise it is easy to introduce impurities

Method used

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  • Method for preparing cobalt ferrite super fine powder at low temperature
  • Method for preparing cobalt ferrite super fine powder at low temperature
  • Method for preparing cobalt ferrite super fine powder at low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1, at first, by CoFe 2 o 4 The general chemical formula will be Co 3 o 4 and Fe 2 o 3 The powders are mixed, and then 200% KOH of the mass of the mixed powder is added to the mixed powder and mixed uniformly to obtain a mixture; secondly, the mixture is put into a container and calcined at 750° C. for 1 hour; finally, the calcined product is finely ground, Washing, filtering to remove salt to obtain superfine cobalt ferrite powder.

Embodiment 2

[0014] Embodiment 2, at first, by CoFe 2 o 4 The general chemical formula will be Co 3 o 4 and Fe 2 o 3 The powders are mixed, and then 100% NaOH of the mixed powder mass is added to the mixed powder and mixed uniformly to obtain a mixture; secondly, the mixture is put into a container and calcined at 700° C. for 2 hours; finally, the calcined product is finely ground, Washing, filtering to remove salt to obtain superfine cobalt ferrite powder.

Embodiment 3

[0015] Embodiment 3, at first, by CoFe 2 o 4 The general chemical formula will be Co 3 o 4 and Fe 2 o 3 The powders are mixed, and then 150% Li of the mass of the mixed powder is added to the mixed powder 2 SO 4 and Na 2 SO 4Mix evenly to obtain a mixture; secondly, put the mixture into a container, and calcinate at 800° C. for 1 hour; finally, grind the calcined product finely, wash, and filter to remove salt to obtain superfine cobalt ferrite powder.

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Abstract

The invention relates to a process for preparing cobalt ferrite ultra-fine powder at low temperature, which comprises that first, according to the chemical formula of CoFe2O4, Co3O4 and Fe2O3 powder are mixed, salt at 80-200% of the mixed powder mass is charged into the mixed powder, to be mixed uniformly to obtain mixture, then the mixture is calcined at 700-900DEG C for 1-2h, at last the calcined product is grinded and washed, and the salt is filtered out to obtain cobalt ferrite ultra-fine powder. The invention charges salt in preparation, to reduce synthesis temperature, with simple process and device, easy operation, cheap raw material and wide material supply, low preparation cost, and batch production support, while the product has better crystal grain growth, small granularity, and little agglomeration or the like.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a method for preparing superfine cobalt ferrite powder at low temperature. Background technique [0002] Cobalt ferrite (CoFe 2 o 4 ) has high magnetocrystalline anisotropy, high coercive force and magnetic saturation strength, its coercive force and resistivity are dozens of times higher than those of magnetogenetic alloys, and its high-frequency magnetic permeability is high. The magnetocrystalline anisotropy constant is as high as about 2.7×10 5 J / m 3 , stable chemical properties and resistance to corrosion and wear, so it has attracted much attention, and is widely used in information storage systems, medical diagnostic technology, magnetic fluid technology, magnetothermal and refrigeration and other fields. In addition, cobalt ferrite magnetic powder can be used as an important microwave absorber because it can maintain high magnetic permeability in the microw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C04B35/26
Inventor 杨海波林营王芬朱建锋
Owner SHAANXI UNIV OF SCI & TECH
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