Method for improving property of dry pressing isotropic permanent magnetic ferrite

A permanent magnet ferrite and isotropic technology, which is applied in the preparation of permanent magnet ferrite magnetic materials and the field of squaring permanent magnet ferrite magnetic tiles, can solve the problems of increasing the cost of raw materials, less crustal reserves, difficulty in refining, etc., so as to improve the reaction Activity, improve magnetic properties, doping uniform effect

Inactive Publication Date: 2013-12-11
SHAOGUAN SIGMA TECH
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Problems solved by technology

La is a rare earth element with few reserves in the earth's crust, difficult to refine, and high price; and Co is called a strategic element, which is very

Method used

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  • Method for improving property of dry pressing isotropic permanent magnetic ferrite
  • Method for improving property of dry pressing isotropic permanent magnetic ferrite

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[0034] Example 1:

[0035] Weigh 150 g of strontium ferrite pre-calcined material, add 1.20 g of calcium carbonate, 0.30 g of boric acid, 0.15 g of kaolin and 180 ml of water, ball mill for 6 hours, filter, and dry at 105°C; then calcinate at 850°C for 6 hours. Then add 0.75 g of calcium carbonate, 0.30 g of boric acid, 0.6 g of sodium lauryl sulfonate and 180 ml of water, and ball mill at 400 r / min for 12 h to prepare an organically coated superfine permanent ferrite slurry material. The average particle size is 0.58um and the BET is 19.8 g / m. 2 . Then add 0.30 g of pre-dissolved PVA, continue ball milling for 3 h, then filter, dry at 80°C, add calcium stearate, granulate, and press to obtain ferrite magnet blanks; in a certain heating curve The temperature is kept at 1220℃ for 2 hours, cooled with the furnace, and then polished to obtain ferrite magnets for motors. Assemble this magnet into a motor, and test Ec value of 1.80 V after magnetizing.

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Abstract

The invention relates to a method for improving the property of a dry pressing isotropic permanent magnetic ferrite, wherein a magnet product used for a motor is obtained through secondarily blending ingredients, secondarily ball-milling, drying and calcining, tertiarily blending ingredients, tertiarily ball-milling, doping polyvinyl acetate in the mixture, drying, pelleting, compressing, sintering and polishing. The calcining process is conducted before sintering to promote Fe<2+> to be fully oxidized into Fe<3+>, so that the raw material can sufficiently become ferrite, an ultrafine powder technique is adopted to improve the reaction activity of the ferrite, so that the doping is more uniform and sufficient, the agglomeration of the ferrite is reduced through organically coating the surface of the ferrite, and meanwhile, tertiary blending ingredients and the ball-milling process are adopted, the magnetic property of the magnetic ferrite is improved on the premise of not adding the rare earth La and the strategic element Co, and the Ec value of a magnet applied in a micro-motor is increased.

Description

technical field [0001] The invention belongs to the technical field of manufacturing magnetic materials, and relates to a method for preparing permanent ferrite magnetic materials, in particular to a method for preparing dry-pressed isotropic permanent ferrite magnetic tiles using ultrafine powder. Background technique [0002] Magnetic materials are widely used in automobiles, home appliances, electric toys, electric tools, computers, office equipment, speakers, microwave ovens and sensors due to their special properties. Ferrite magnetic material has become the most widely used magnetic material because of its easy-to-obtain raw materials, low price and high cost performance. With the rapid development of my country's economy, the annual output of ferrite magnetic materials in my country accounts for more than 60% of the global annual output. [0003] According to the characteristics of magnetic properties, ferrite mainly includes permanent ferrite and soft ferrite. Amon...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/63C04B35/632C04B35/622
Inventor 周贤界徐修冬郑子涛
Owner SHAOGUAN SIGMA TECH
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