Preparation method of permanent magnetic ferrite material

A permanent magnet ferrite and raw material technology, which is applied in the field of permanent magnet ferrite material preparation, can solve the problems of poor chemical uniformity, high energy consumption and cost, and low density of the mixture, and achieve high density, low energy consumption, Effect of Microstructural Optimization

Inactive Publication Date: 2014-05-21
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a preparation method of permanent magnet ferrite material to solve the problems of poor chemical uniformity, low density, high energy consumption and cost, and poor magnetic properties of the mixture existing in the existing permanent magnet ferrite sintering technology. lower question

Method used

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preparation example Construction

[0011] The preparation method of the permanent magnet ferrite material provided in this specific embodiment specifically includes the following steps:

[0012] Step 1, according to the main phase of permanent magnet ferrite MO·nFe 2 o 3 The molar ratio is weighed to configure the raw materials, where Fe 2 o 3 Purity≧99.2%, M means SrCO 3 And the purity is ≧98.0%, and the primary additive added to the raw material is SiO 2 , CaCO 3 or Bi 2 o 3 at least one of;

[0013] Step 2, put the raw materials into the intensive mixer and mix for 3 to 10 minutes, then put the mixture into the vibration mill and mix for 1 to 5 minutes;

[0014] Step 3, making pellets from the mixed raw materials, and pre-burning in the air, the pre-burning temperature is 1150-1250 °C, and the temperature is kept for 1-4 hours;

[0015] Step 4, pulverizing the pre-calcined raw materials through a ball mill to obtain coarse powder, and performing particle size screening on the coarse powder, the part...

Embodiment 1

[0025] Ingredients: According to Fe 2 o 3 with SrCO 3 The molar ratio of n=5.8 is used for the main material preparation, and the primary additive SiO 2 =0.3%wt, CaCO 3 =0.2wt%, where Fe 2 o 3 Purity≥99.2%, SrCO 3 Purity≥98.0%.

[0026] Mixing: Put the weighed raw materials into the intensive mixer and mix for 5 minutes. Put the mixture into a vibrating mill and mix for 3 minutes.

[0027] Pre-burning: The raw material powder obtained in the mixing process is pelletized, and pre-fired in air at a temperature of 1200°C for 2 hours.

[0028] Coarse crushing: crush the calcined material with a ball mill to obtain a coarse powder, and carry out particle size screening at the same time, and the particle size of the coarse powder is close to 4um.

[0029] Fine grinding: Add secondary additives to the coarse powder obtained by coarse grinding and use a ball mill for fine grinding, using water as the dispersion medium to obtain a fine grinding slurry. After the slurry is drie...

Embodiment 2

[0035] Ingredients: According to Fe 2 o 3 with SrCO 3 The molar ratio of n=5.8 is used for the main material preparation, and the primary additive SiO 2 =0.3%wt. where Fe 2 o 3 Purity≥99.2%, SrCO 3 Purity≥98.0%.

[0036]Mixing: Put the weighed raw materials into the intensive mixer and mix for 5 minutes. Put the mixture into a vibrating mill and mix for 3 minutes.

[0037] Pre-calcination: The raw material powder obtained in the mixing process is pelletized, and pre-fired in air at a pre-calcination temperature of 1170°C for 2 hours.

[0038] Coarse crushing: crush the calcined material with a ball mill to obtain a coarse powder, and carry out particle size screening at the same time, and the particle size of the coarse powder is close to 4um.

[0039] Fine grinding: Add secondary additives to the coarse powder obtained by coarse grinding and use a ball mill for fine grinding, using water as the dispersion medium to obtain a fine grinding slurry. After the slurry is d...

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Abstract

The invention discloses a preparation method of a permanent magnetic ferrite material. The preparation method comprises the steps of weighing and preparing raw materials depending on mol ratio of a permanent magnetic ferrite main phase MO.nFe2O3, wherein M represents SrCO3, and n represents a mol ratio of Fe2O3 to SrCO3 and ranges from 5.5 to 6.0, and a primary additive added to the raw materials is selected from at least one of SiO2, CaCO3 and Bi2O3; mixing, pre-sintering and grinding the raw materials added with the primary additive, and implementing wet compression molding to obtain the permanent magnetic ferrite material. The preparation method disclosed by the invention, through application of a mixing process and a nano additive, optimizes a micro structure of the permanent magnetic material, thus providing a preparation method of the high-performance sintered permanent magnetic ferrite material which is good in chemical uniformity of mixture, relatively high in density, low in energy consumption and free from addition of rare earth element.

Description

technical field [0001] The invention relates to a preparation method of a permanent magnet ferrite material, which belongs to the technical field of ferrite materials. Background technique [0002] Permanent ferrite materials are widely used in the electronics industry, household appliances and electrical equipment and other fields. With the development of science and technology, electronic equipment is developing toward miniaturization, light weight, and thinning, which puts forward higher requirements for the performance of permanent ferrite materials. The addition of rare earth elements provides an effective way to develop high-performance permanent ferrite magnetic materials, but the price of rare earths has risen in recent years, and the use of rare earth elements such as La and Co to develop high-performance permanent ferrites will increase production costs, which is not conducive to Improvement of economic benefits of enterprises. [0003] The permanent magnet ferri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 王常蕾王颖泉连江滨刘辉滕阳民
Owner BGRIMM TECH CO LTD
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