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A kind of barium permanent magnet 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 increasing production costs, losing the high cost performance of M-type permanent ferrites, and preventing excessive growth. , Conducive to uniform growth and improve coercivity

Active Publication Date: 2022-05-20
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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  • A kind of barium permanent magnet ferrite and preparation method thereof

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Experimental program
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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 , 165gLa 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 wat...

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

A kind of barium permanent magnet ferrite and preparation method thereof, the chemical formula of this barium permanent magnet ferrite is La 1‑x‑y Ca y Ba x Fe 2n−z co z o 19 The preparation method includes the following steps: (1) batching and ball milling; (2) drying and pre-calcining; (3) vibration milling; (4) secondary ball milling; The barium permanent magnet ferrite of the invention has uniform crystal grains, high degree of orientation and excellent magnetic properties, and the preparation method has low energy consumption and simple operation.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/10C04B35/32C04B35/40C04B35/64H01F1/34H01F41/02
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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