Prepn of doped magnetic ferrite material

A magnetic material and ferrite technology, which is applied in the field of preparation of doped ferrite magnetic materials, can solve the problems of difficult precise control of doping amount, long relative sintering time, high sintering phase temperature, etc., to shorten the production cycle, Shorter sintering time and better repeatability

Inactive Publication Date: 2004-04-07
SHANGHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new method described by this patented allows for precise addition or removal of dopants during processing without affecting other important characteristics such as particle shape and crystal structure. It also reduces power usage compared to previous methods while maintaining high productivity rates. Additionally, it achieves better results due to improved stability at higher temperatures used when making ceramic products.

Problems solved by technology

This patents discusses various techniques for producing pure iron (Fe) magnets without any harmful chemical compounds or other unwanted effects from adding dopants like metals or carbons into their starting ingredients. These processes have drawbacks including longer manufacturing cycles due to the use of solvents, energy consumption required when heating them up, contamination issues caused by residual gases generated during the grinding step, difficulty controlling final products' physical attributes resulting in variations between specifications and reduced reliance on new designs.

Method used

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  • Prepn of doped magnetic ferrite material
  • Prepn of doped magnetic ferrite material
  • Prepn of doped magnetic ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: take by weighing Ni(NO) that chemical purity is 98% 3 ) 2 ·6H 2 O 112.66 g, Zn with a purity of 99% (NO 3 ) 2 ·6H 2 O 76.06 g, Fe(NO 3 ) 3 9H 2 O 521.76 g, 99% pure C 6 h 8 o 7 ·H 2 O 400.89 grams and the salt Co(NO 3 )·6H 2 O appropriate amount; use 354ml of deionized water to configure an aqueous solution respectively. Fix the wide-mouth cup in the thermostat, and control the temperature at the best 60°C. Slowly pour the prepared solution into the wide-mouth cup in sequence, and stir at constant temperature for about 60 minutes. While stirring, use a dropper Add ethylenediamine dropwise to adjust the pH value of the solution to 5-7. At this time, the wet gel solution turns dark green. Put the prepared wet gel solution directly on the electric furnace for evaporation, remove most of the water, put the gel in the sintering furnace, and pre-fire at 500°C for 15 minutes as needed. At this point, the gel turns into a reddish-brown fluffy pow...

Embodiment 2

[0017] Embodiment 2: The preparation method is the same as that of Embodiment 1, except that copper nitrate is used for doping with metal nitrate, and the sintering temperature is 1100°C.

[0018] According to the magnetic spectrum of the different cobalt-doped and copper-doped ferrite magnetic materials prepared by the inventive method, see figure 1 and figure 2 . From figure 1 and figure 2 It can be seen from the figure that, for the doped ferrite magnetic material prepared by the method of the present invention, the influence of the slight change of the dopant on the electromagnetic properties of the final sample can be detected and controlled, and the process is stable, easy to repeat, and the performance Stablize.

[0019] The method of the invention is not only applicable to the doping of various soluble salt solutions of alkaline earth metals, main metals, transition metals, nonmetals and rare earth elements, but also can be used for mixed doping of two or more el...

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Abstract

The present invention belongs to the field of magnetic material preparing technology. The technological scheme is that the preparation of doped magnetic ferrite material includes mixing metal nitrate solution and citric acid solution under acid condition, adding nitrate solution of the metal to be doped, regulating PH value to produce liquid phase reaction to produce one kind of wet gel solution; evaporating excessive water via heating on electric furnace to form gel; pre-baking the gel solution at certain temperature to obtain doped nano crystalline ferrite powder; pressing the ferrite powder into required shape and sintering to obtain the doped magnetic ferrite material. The doping process is completed in the stoichiometric sol stage and this makies the prepared material homogeneous. The said preparation process is short in preparation period, low in power consumption, well controllable, high in repeatability and good in transplantation performance.

Description

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Claims

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Application Information

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Owner SHANGHAI UNIV
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