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High-performance SrFe12O19/CoFe2O4 composite ferrite material and preparation method

A srfe12o19, ferrite material technology, applied in the direction of inductor/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve problems such as unsatisfactory research results, improve comprehensive magnetic properties, improve mixing uniformity, and low cost Effect

Active Publication Date: 2017-05-10
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the research results are not ideal, and how to improve the performance of a single ferrite material through compounding still needs further research by researchers.

Method used

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  • High-performance SrFe12O19/CoFe2O4 composite ferrite material and preparation method
  • High-performance SrFe12O19/CoFe2O4 composite ferrite material and preparation method
  • High-performance SrFe12O19/CoFe2O4 composite ferrite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] SrFe 12 o 19 with CoFe 2 o 4 Stoichiometric ratio weighing analysis of pure iron oxide (Fe 2 o 3 ), cobalt trioxide (Co 2 o 3 ), strontium carbonate (SrCO 3 ). They were respectively placed in polytetrafluoroethylene ball mill jars for ball milling at a rotational speed of 180 r / min for 5 hours, and then the ball milled mixed slurry was dried in a drying oven for 24 hours. Put it in a high-temperature box-type sintering furnace to 1000 ° C for 4 hours to obtain CoFe 2 o 4 Powder; placed in a high-temperature box-type sintering furnace to 1100 ° C for 2 hours to obtain SrFe 12 o 19 Powder.

[0028] Weigh the SrFe respectively12 o 19 Powder 5.481g, CoFe 2 o 4 Powder 0.519g, mix uniformly in a mortar, then add an appropriate amount of polyvinyl alcohol (PVA) with a mass concentration of 8% of the mixture as a binder, mix and granulate to obtain pellets, and press it into a tablet under 20MPa (diameter Φ=12.98mm, thickness d≈2mm).

[0029] The sheet materia...

Embodiment 2

[0032] SrFe 12 o 19 with CoFe 2 o 4 Stoichiometric ratio weighing analysis of pure iron oxide (Fe 2 o 3 ), cobalt trioxide (Co 2 o 3 ), strontium carbonate (SrCO 3 ). They were respectively placed in polytetrafluoroethylene ball mill jars for ball milling at a rotational speed of 180 r / min for 5 hours, and then the ball milled mixed slurry was dried in a drying oven for 24 hours. Put it in a high-temperature box-type sintering furnace to 1000 ° C for 4 hours to obtain CoFe 2 o 4 Powder; placed in a high-temperature box-type sintering furnace to 1100 ° C for 2 hours to obtain SrFe 12 o 19 Powder.

[0033] Weigh the SrFe respectively 12 o 19 Powder 5.481g, CoFe 2 o 4 Powder 0.519g, mix uniformly in a mortar, then add an appropriate amount of polyvinyl alcohol (PVA) with a mass concentration of 8% of the mixture as a binder, mix and granulate to obtain pellets, and press it into a tablet under 20MPa (diameter Φ=12.98mm, thickness d≈2mm).

[0034] The sheet mater...

Embodiment 3

[0037] SrFe 12 o 19 with CoFe 2 o 4 Stoichiometric ratio weighing analysis of pure iron oxide (Fe 2 o 3 ), cobalt trioxide (Co 2 o 3 ), strontium carbonate (SrCO 3 ). They were respectively placed in polytetrafluoroethylene ball mill jars for ball milling at a rotational speed of 180 r / min for 5 hours, and then the ball milled mixed slurry was dried in a drying oven for 24 hours. Put it in a high-temperature box-type sintering furnace to 1000 ° C for 4 hours to obtain CoFe 2 o 4 Powder; placed in a high-temperature box-type sintering furnace to 1100 ° C for 2 hours to obtain SrFe 12 o 19 Powder.

[0038] Weigh the SrFe respectively 12 o 19 Powder 2.007g, CoFe 2 o 4 Powder 3.993g, mix uniformly in a mortar, then add an appropriate amount of polyvinyl alcohol (PVA) with a mass concentration of 8% of the mixture as a binder, mix and granulate to obtain pellets, and press it into a tablet under 20MPa (diameter Φ=12.98mm, thickness d≈2mm).

[0039] The sheet mater...

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Abstract

The invention relates to a high-performance SrFe12O19 / CoFe2O4 composite ferrite material and a preparation method. The chemical structural formula of the composite ferrite material is xSrFe12O19 / yCoFe2O4, where x is more than 0 and less than 1, y is more than 0 and less than 1 and the sum of x and y is equal to 1. The preparation method for the composite ferrite material comprises the steps of mixing, pre-sintering, preforming and sintering treatment. According to the composite ferrite material and the preparation method, a ferrite SrFe12O19 and a ferrite CoFe2O4 undergo magnetic exchange coupling by virtue of own high magnetic performance of the hexagonal ferrite SrFe12O19 and the spinel type ferrite CoFe2O4 to further endow the SrFe12O19 / CoFe2O4 composite ferrite material with high saturation magnetization (Ms) and strong coercive force (Hc), effectively overcome the shortcomings of a single ferrite material and expand the application fields.

Description

technical field [0001] The invention belongs to the field of ferrite materials, in particular to a high-performance SrFe 12 o 19 / CoFe 2 o 4 Composite ferrite material and preparation method. Background technique [0002] As a magnetic material, ferrite has attracted much attention because of its low cost, stable environment, high saturation magnetization and other advantages. Ferrite materials are widely used in permanent magnet motors, magnetic separation equipment, magnetic records, and microwaves. Among them, as magnetoplumbite type ferrite AFe 12 o 19 (Usually Ba, Sr, or both in the A position), and there has been a great international demand for it. Hexagonal ferrite SrFe 12 o 19 As a hard magnetic material, it has a high coercive force (Hc). In order to improve the magnetic properties of this kind of hard magnetic material, the research on the exchange coupling effect of its composite material has become a hot spot. For example in SrFe 12 o 19 / (Ni,Zn)Fe ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/32C04B35/634C04B35/626H01F1/113H01F41/02
CPCC04B35/2633C04B35/2666C04B35/2683C04B35/6261C04B35/62645C04B35/63416C04B2235/96H01F1/113H01F41/0246
Inventor 刘银赵莉郑林义
Owner ANHUI UNIV OF SCI & TECH
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