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BaFe12O19/CoFe2O4 layered permanent magnetic composite material and preparation method thereof

A technology of bafe12o19 and composite materials, which is applied in the field of material science, can solve problems affecting magnetic properties and exchange coupling effects, and achieve the effects of easy large-scale production, suppression of mutual reactions, and simple processes

Active Publication Date: 2015-05-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the uneven dispersion of the two phases in the matrix, it will affect the exchange coupling between the two phases, thereby affecting the magnetic properties.

Method used

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  • BaFe12O19/CoFe2O4 layered permanent magnetic composite material and preparation method thereof
  • BaFe12O19/CoFe2O4 layered permanent magnetic composite material and preparation method thereof
  • BaFe12O19/CoFe2O4 layered permanent magnetic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a BaFe 12 o 19 / CoFe 2 o 4 The chemical expression of the layered permanent magnet composite is (1-x)BaFe 12 o 19 / xCoFe 2 o 4 , where x is CoFe 2 o 4 The mass percentage of x=11.1%.

[0037] The above BaFe 12 o 19 / CoFe 2 o 4 The preparation method of layered permanent magnetic composite material comprises the following steps:

[0038] 1) According to the general chemical formula BaFe 12 o 19 will analyze pure BaCO 3 , Fe 2 o 3 After preparation (that is, mixing), wet ball mill for 4 hours, then dry, sieve, briquette, and pre-burn at 1150 ° C for 6 hours, then crush the resulting block sample and pass through a 120-mesh sieve to obtain BaFe 12 o 19 Powder.

[0039] 2) to BaFe 12 o 19 The powder is granulated after adding a 10% polyvinyl alcohol aqueous solution, and then sieved through a 60-mesh sieve to obtain BaFe 12 o 19 powder; wherein, the mass of polyvinyl alcohol aqueous solution is BaFe 12 o 19 12% of powder mass;

[0040] 3) Accordin...

Embodiment 2

[0048] a BaFe 12 o 19 / CoFe 2 o 4 The chemical expression of the layered permanent magnet composite is (1-x)BaFe 12 o 19 / xCoFe 2 o 4 , where x is CoFe 2 o 4 The mass percentage of x=22.2%.

[0049] The above BaFe 12 o 19 / CoFe 2 o 4 The preparation method of layered permanent magnetic composite material comprises the following steps:

[0050] 1) According to the general chemical formula BaFe12 o 19 will analyze pure BaCO 3 , Fe 2 o 3 After preparation (that is, mixing), wet ball mill for 4 hours, then dry, sieve, briquette, and pre-burn at 1200 ° C for 4 hours, then crush the resulting block sample and pass through a 120-mesh sieve to obtain BaFe 12 o 19 Powder.

[0051] 2) to BaFe 12 o 19 The powder is granulated after adding a 10% polyvinyl alcohol aqueous solution, and then sieved through a 60-mesh sieve to obtain BaFe 12 o 19 powder; wherein, the mass of polyvinyl alcohol aqueous solution is BaFe 12 o 19 10% of powder mass;

[0052] 3) According ...

Embodiment 3

[0060] a BaFe 12 o 19 / CoFe 2 o 4 The chemical expression of the layered permanent magnet composite is (1-x)BaFe 12 o 19 / xCoFe 2 o 4 , where x is CoFe 2 o 4 The mass percentage of x=33.3%.

[0061] The above BaFe 12 o 19 / CoFe 2 o 4 The preparation method of layered permanent magnetic composite material comprises the following steps:

[0062] 1) According to the general chemical formula BaFe 12 o 19 will analyze pure BaCO 3 , Fe 2 o 3 After preparation (that is, mixing), wet ball mill for 4 hours, then dry, sieve, briquette, and pre-burn at 1170 ° C for 5 hours, then crush the resulting block sample and pass through a 120-mesh sieve to obtain BaFe 12 o 19 Powder.

[0063] 2) to BaFe 12 o 19 The powder is granulated after adding a 10% polyvinyl alcohol aqueous solution, and then sieved through a 60-mesh sieve to obtain BaFe 12 o 19 powder; wherein, the mass of polyvinyl alcohol aqueous solution is BaFe 12 o 19 8% of powder mass;

[0064] 3) According...

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Abstract

The invention relates to a BaFe12O19 / CoFe2O4 layered permanent magnetic composite material and a preparation method thereof. The chemical formula is as follows: (1-x)BaFe12O19 / xCoFe2O4, wherein x is the weight percentage of CoFe2O4 and is greater than or equal to 11.1% but less than or equal to 33.3%. The preparation method comprises the following steps: compressing and molding BaFe12O19 and CoFe2O4 powder according to a barrier layer arrangement mode of 2-2 composition in a die; and removing a PVA adhesive and sintering at 1300-1350 DEG C to obtain the BaFe12O19 / CoFe2O4 layered permanent magnetic composite material. As the BaFe12O19 powder and CoFe2O4 powder have a full exchange coupling effect, so that interaction between two phases can be effectively inhibited so as to obtain the composite material which is excellent in magnetic performance and dielectric property.

Description

technical field [0001] The invention belongs to the field of material science and relates to a BaFe 12 o 19 / CoFe 2 o 4 Layered permanent magnetic composite material and its preparation method. Background technique [0002] With the rapid development of mobile communication and computer technology, various electronic devices have become more highly integrated, multi-functional, miniaturized and responsive. Magnetic materials are an important branch of functional materials. Magnetic components made of magnetic materials have the functions of converting, transmitting, processing information, storing energy, and saving energy. They are widely used in energy, telecommunications, automatic control, communications, household appliances, Biology, medical and health, light industry, mineral processing, physical prospecting, military industry and other fields, especially in the field of information technology has become an indispensable part. The general trend of informatization...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 杨海波刘淼林营朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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