Method for improving magnetic performance of permanent magnetic ferrite

A technology of permanent magnet ferrite and magnetic properties, applied in the direction of magnetic properties of inorganic materials, etc., can solve the problems of inability to obtain magnetic properties, decline of magnetic properties of materials, etc., to improve the molding efficiency and pass rate, excellent magnetic properties, and reduce production costs. Effect

Inactive Publication Date: 2020-05-05
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Abstract
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Problems solved by technology

Under the technical conditions of the slurry particle size greater than 1.0 μm, the magnetic properties of the material will decrease rapidly, and the magnetic properties with practical value cannot be obtained.

Method used

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  • Method for improving magnetic performance of permanent magnetic ferrite
  • Method for improving magnetic performance of permanent magnetic ferrite
  • Method for improving magnetic performance of permanent magnetic ferrite

Examples

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Embodiment

[0029] Each present embodiment comprises the following steps:

[0030] (1) Select permanent magnet ferrite pre-fired material powder, 1000g of each material powder as the main raw material, add permanent magnet ferrite pre-fired material in the ball mill, add additives calcium carbonate, silicon dioxide, zinc borate, Lanthanum oxide, then add water, and ball mill to obtain permanent magnet ferrite slurry;

[0031] (2) Precipitation and filtration of the permanent magnet ferrite slurry obtained in step (1) to obtain the permanent magnet ferrite filter slurry;

[0032] (3) injecting the permanent magnet ferrite filter slurry obtained in step (2) into a mould, and pressurizing and molding under a magnetic field to obtain a permanent magnet ferrite green body;

[0033] (4) Sintering the permanent magnet ferrite green body obtained in step (3) to obtain permanent magnet ferrite.

[0034] Add the main raw materials and formula to the ball mill, add 1500g of water, and ball mill th...

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Abstract

A method for improving the magnetic property of a permanent magnetic ferrite comprises the following steps: (1) adding a permanent magnetic ferrite pre-sintered material into a ball mill, adding calcium carbonate, silicon dioxide, zinc borate and lanthanum oxide, adding water, and carrying out ball milling to obtain permanent magnetic ferrite slurry; (2) precipitating and filtering the permanent magnetic ferrite slurry obtained in the step (1) to obtain permanent magnetic ferrite filter slurry; (3) injecting the permanent magnetic ferrite filter slurry obtained in the step (2) into a mold, andcarrying out pressure molding in a magnetic field to obtain a permanent magnetic ferrite green body; and (4) sintering the permanent magnetic ferrite green body obtained in the step (3) to obtain thepermanent magnetic ferrite. Compared with the traditional process method, the technical scheme provided by the invention can obtain excellent magnetic performance under the condition that the granularity of the slurry is greater than or equal to 1.0 [mu]m, so that the forming difficulty of the slurry is reduced, the production efficiency is improved, and the method is more suitable for preparinga permanent magnet device with a complex shape.

Description

technical field [0001] The invention relates to a method for manufacturing permanent magnet ferrite, in particular to a method for manufacturing high-performance permanent magnet ferrite. Background technique [0002] Permanent magnetic material, also known as hard magnetic material, is a material that can provide a constant magnetic field to the outside world after magnetization. [0003] The permanent ferrite material maintains a large magnetic energy after being magnetized, and can provide a constant magnetic field for a long time, so it can be used as a medium for the mutual conversion of electrical energy and mechanical energy. [0004] Since permanent ferrite magnets are oxides sintered at high temperatures, there is no problem of corrosion at high temperatures, and they have high stability. At present, they are mainly used to prepare parts for various types of motors and electroacoustic products. They mainly serve Automotive, home appliances and information equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622H01F1/10
CPCC04B35/2608C04B35/2641C04B35/622C04B2235/3208C04B2235/3227C04B2235/3409C04B2235/3418H01F1/10
Inventor 郑亮张铁军邓兴民邱棒祥
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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