Preparation method of biphase composite hard magnetic ferrite nano-powder with exchange coupling

A technology of hard ferrite and nano-powder, applied in the direction of magnetism of inorganic materials, can solve problems such as unfavorable exchange coupling effect, and achieve the effect of simple preparation method

Active Publication Date: 2013-12-18
扬州华翀电力电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the oxide method is not conducive to the formation of the exchange coupling effect

Method used

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  • Preparation method of biphase composite hard magnetic ferrite nano-powder with exchange coupling
  • Preparation method of biphase composite hard magnetic ferrite nano-powder with exchange coupling
  • Preparation method of biphase composite hard magnetic ferrite nano-powder with exchange coupling

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Experimental program
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Effect test

Embodiment 1

[0021] First prepare SrFe separately 12 o 19 Powder: to analyze pure nitrate (Sr(NO 3 ) 2 , Fe(NO 3 ) 3 ) as raw material to prepare 2mmol of SrFe 12 o 19 Powder, the molar ratio of Fe and Sr in the raw material is 4:1, and Sr(NO 3 ) 2 2mmol, Fe(NO 3 ) 3 8mmol; according to molar ratio Proportioning required NaOH, that is, 84mmol NaOH is required. The nitrate raw material was dissolved in 45 ml deionized water, and the NaOH was dissolved in 30 ml deionized water. Then, while stirring, NaOH solution is added dropwise to the mixed nitrate solution to make the metal ion precipitate, and the precipitate and the precipitate are moved into a 100ml hydrothermal reaction kettle for hydrothermal reaction, while controlling the filling degree of the reactor to be 80%, and the reaction conditions are 220 °C×5h. The product obtained after the reaction was washed 3 times and 2 times with deionized water and absolute ethanol, respectively. To ensure the purity of the phase, t...

Embodiment 2

[0025] Preparation method is the same as embodiment 1, and the parameter of change is: control mass ratio SrFe 12 o 19 : Ni 0.4 Zn 0.6 Fe 2 o 4 1:1. The hysteresis loop of the resulting pure oxide composite ferrite is listed in Figure 4 middle. It can be seen from the figure that the composite ferrite powder sample does not have a stepped or necked two-phase characteristic curve, but a good single-phase hard magnetic characteristic curve, which indicates that there is a good exchange coupling effect in the sample.

Embodiment 3

[0027] Preparation method is the same as embodiment 1, and the parameter of change is: control mass ratio SrFe 12 o 19 : Ni 0.4 Zn 0.6 Fe 2 o 4 It is 1:2. From Figure 4 It can be seen from the hysteresis loop that there is a good exchange coupling effect in the composite ferrite powder sample.

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Abstract

The invention discloses a preparation method of biphase composite hard magnetic ferrite nano-powder with hard magnetic/soft magnetic exchange coupling, belonging to the technical field of preparation of magnetic ferrites. The method comprises the following steps: directly adding hydrochloric acid-cleaned SrFe12O19 ferrite nano-powder which is prepared by a hydrothermal method into a reaction kettle for preparing NixZn(1-x)Fe2O4 ferrite nano-powder by the hydrothermal method; directly preparing the nano composite ferrite powder at a low temperature, wherein the prepared biphase powder which is not sintered at a high temperature shows a single phase magnetic behavior, namely the powder has the exchange coupling effect. The preparation method disclosed by the invention is simple and applicable tofor preparing pure oxide biphase composite hard magnetic ferrite nano-powder with hard magnetic/soft magnetic exchange coupling.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic ferrite, in particular to a preparation method of pure oxide two-phase composite hard ferrite nanopowder with hard magnetic / soft magnetic exchange coupling. Background technique [0002] Hard ferrite is one of the most common ferrimagnetic materials. Although it has a long history, it is still widely used in many industries due to its high cost performance, cheap raw materials and good chemical stability, and its output is very large. However, as a big country in the production of hard ferrite, my country's production technology is much behind that of Europe, America and Japan, and it is still not a strong country in the production of hard ferrite. For this reason, it is urgent to find a new preparation method of hard ferrite to improve the production level of hard ferrite in our country. [0003] The magnetic properties of the hard magnetic material can be effectively improved by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/30C04B35/622H01F1/10
Inventor 夏爱林左从华晋传贵吴胜华胡绪照任素贞
Owner 扬州华翀电力电子科技有限公司
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