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Barium permanent magnetic ferrite and preparation method thereof

A technology of permanent magnet ferrite and molded body, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of losing the high cost performance of M-type permanent ferrites and increasing production costs, and achieves uniform growth. , to prevent excessive growth, the effect of low energy consumption

Active Publication Date: 2020-05-15
湖南航天磁电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetoelectric properties of the permanent magnet ferrite prepared by this method have been improved, but a large amount of expensive Nd 2 o 3 and Gd 2 o 3 , which greatly increases the production cost and loses the cost-effective characteristics of M-type permanent magnet ferrite
[0004] CN201410066900.6 discloses a molten salt as a solid-phase reaction medium to prepare barium permanent magnet ferrite material, which uses 10%-20% molten salt reaction to increase the diffusion rate, reduce reaction time and temperature, but this method uses A large amount of molten salt needs to be stirred and washed by adding water to the calcined material, which increases the production cost

Method used

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  • Barium permanent magnetic ferrite and preparation method thereof

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Effect test

Embodiment 1

[0037] The preparation method of the present embodiment barium permanent magnet ferrite comprises the following steps:

[0038] (1) Ingredients, ball milling: weigh 1680g Fe 2 o 3 , 24.4g BaCO 3 , 72g CaCO 3 , 48.2g Co 3 o 4 , 165g La 2 o 3 , add 2400ml of deionized water, place in a roller ball mill, and ball mill for 3 hours to obtain a mixed slurry;

[0039] (2) Drying and pre-calcination: dry the mixed slurry obtained in step (1) at 120°C for 8 hours to obtain a powder, and then pre-fire the powder at 1100°C for 2 hours in an air atmosphere to obtain a pre-fired material;

[0040] (3) Vibration milling: put the calcined material obtained in step (2) in a vibrating mill, and vibrate for 100 seconds to obtain a coarse powder with an average particle size of 3 μm;

[0041] (4) Secondary ball milling: Weigh 400g of the coarse powder obtained in step (3), add 3.2g of CaCO 3 , 0.8gBi 2 o 3 , 1gBaSi 2 o 5 , 2g calcium gluconate, 0.8 boric acid and 1200mL deionized wa...

Embodiment 2

[0044] Add 0.9%CaCO in this embodiment 3 -0.2% Bi 2 o 3 -0.25%BaSi 2 o 5 Composite sintering aid (based on the weight of coarse powder), other operating steps are the same as in Example 1.

Embodiment 3

[0046] Add 0.8%CaCO in this embodiment 3 -0.15% Bi 2 o 3 -0.25%BaSi 2 o 5 Composite sintering aid (based on the weight of coarse powder), other operating steps are the same as in Example 1.

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Abstract

The invention discloses a barium permanent magnetic ferrite and a preparation method thereof. The chemical formula of the barium permanent magnetic ferrite is La1-x-yCayBaxFe2n-zCozO19. The preparation method comprises the following steps: (1) burdening and ball-milling; (2) drying and presintering; (3) vibration grinding; (4) secondary ball milling; and (5) compression molding and sintering. Thebarium permanent magnetic ferrite is uniform in crystal grain, high in orientation degree and excellent in magnetic performance, and the preparation method of the barium permanent magnetic ferrite islow in energy consumption and easy to operate.

Description

technical field [0001] The invention relates to the field of ferrite and a preparation method thereof, in particular to a barium permanent magnet ferrite and a preparation method thereof. Background technique [0002] Sintered permanent magnet ferrite has the advantages of high magnetic properties, corrosion resistance and low price, and is widely used in the automobile and home appliance industries. At present, the sintered permanent ferrite mostly uses magnetoplumbite type (M type) strontium ferrite or barium ferrite to sinter the magnet, and its chemical formula is Ba(Sr)Fe 12 o 19 , but the magnetic performance of this type of permanent ferrite is not high. [0003] In order to improve its magnetic properties, CN201110153849 discloses a rare earth substituted permanent magnet ferrite material whose chemical formula is D 1-x R x O nFe 2-y-z ln z co y o 3 , the permanent magnet ferrite material and the traditional permanent magnet ferrite AB 12 0 19 In contrast, ...

Claims

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Application Information

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IPC IPC(8): C04B35/32C04B35/40C04B35/64H01F1/34H01F41/02
CPCC04B35/2633C04B35/2641C04B35/64H01F41/02H01F1/344C04B2235/442C04B2235/3227C04B2235/3298C04B2235/3427C04B2235/96
Inventor 陈肯谭春林胡盛青郑亮
Owner 湖南航天磁电科技有限公司
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