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Permanent magnet barium ferrite material and preparation method thereof

A barium ferrite and permanent magnet technology, which is applied in the field of permanent magnet barium ferrite materials and its preparation, can solve the problems of forming leading technology and mass production, and there are many research reports on barium ferrite. Achieve the effects of low cost, increased kiln output, and high magnetic performance

Active Publication Date: 2014-06-04
浙江省东阳市中航磁性有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are many research reports on the production of high-coercivity barium ferrite, but there are no reports on the formation of leading technology and mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to BaO:Fe 2 o 3 =1:5.3 molar ratio, using 97% pure BaCo 3 And the proportioning of rolled iron and steel phosphorus with an iron content of 73%, centralized storage after weighing raw materials, without adding other additives, according to the weight ratio of material: ball: water = 1:6:1.3 into the ball mill, the total charge of the ball mill is one ton, Ball milling for 20 hours, the particle size reaches 1um, filter and dry the ball abrasive, press it into a φ100×80mm honeycomb pressed cake, put it into a gas tunnel kiln for pre-firing, sintering temperature is 1220°C, keep warm for 2 hours, and keep the air in the kiln containing oxygen The amount is more than 6%. After sintering, the sheet-shaped hexagonal crystals can be seen under a magnifying glass. The material is ball milled again, and Bi2o is added by weight at the same time 3 0.1%, SiO 2 0.4%, ball milling to 0.95um, after molding and secondary sintering at 1240℃, the formation rate of solid...

Embodiment 2

[0029] According to BaO:Fe 2 o 3 =1:5.6 molar ratio, using 97% pure BaCo 3 And the proportioning of rolled iron and steel phosphorus with an iron content of 73%, centralized storage after weighing raw materials, without adding other additives, according to the weight ratio of material: ball: water = 1:6:1.3 into the ball mill, the total charge of the ball mill is one ton, Ball milling for 18 hours, the particle size reaches 1um, filter and dry the ball abrasive, press it into a φ100×80mm honeycomb pressed cake, put it into a gas tunnel kiln for pre-firing, sintering temperature is 1200°C, keep warm for 2 hours, and at the same time keep the air in the kiln containing oxygen The amount is more than 6%. After sintering, the sheet-shaped hexagonal crystals can be seen under a magnifying glass. The material is ball milled again, and Bi2o is added by weight at the same time 3 0.05%, SiO 2 0.25%, ball milled to 0.95um, after molding and secondary sintering at 1220℃, the forma...

Embodiment 3

[0031] According to BaO:Fe 2 o 3 =1:5.9 molar ratio, using 97% pure BaCo 3 And the proportioning of rolled iron and steel phosphorus with an iron content of 73%, centralized storage after weighing raw materials, without adding other additives, according to the weight ratio of material: ball: water = 1:6:1.3 into the ball mill, the total charge of the ball mill is one ton, Ball milling for 24 hours, the particle size reaches 1um, filter and dry the ball abrasive, press it into a φ100×80mm honeycomb pressed cake, put it into a gas tunnel kiln for pre-firing, sintering temperature is 1250°C, keep warm for 2 hours, and keep the air in the kiln containing oxygen The amount is more than 6%. After sintering, the sheet-shaped hexagonal crystals can be seen under a magnifying glass. The material is ball milled again, and Bi2o is added by weight at the same time 3 0.15%, SiO 2 0.65%, ball milled to 0.95um, after molding and secondary sintering at 1260°C, the formation rate of soli...

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Abstract

The invention provides a permanent magnet barium ferrite material and a preparation method thereof. The permanent magnet barium ferrite material has following structural formula: BaO. nFe2O3, wherein n=5.3-5.9. According to the permanent magnet barium ferrite material and the preparation method thereof, the cost is low, BaCo3 is rich and cheap, and the price of the BaCo3 is one fourth of that of SrCo3. besides, by means of low temperature solid-phase reaction, energy is saved, the service life of furnaces is prolonged, and the yield of the furnaces is increased; and the barium ferrite material is high in remanence (Br) and coercive forces relative to convention barium ferrite and suitable for being used in sounders, microphones and sensors of small air gap magnetic circuits and closed magnetic circuits.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet ferrite, in particular to a permanent magnet barium ferrite material and a preparation method thereof. Background technique [0002] Permanent magnet ferrite belongs to the spindle type hexagonal crystal system, mainly barium ferrite, strontium ferrite, lead ferrite, etc. The general molecular formula of such compounds is: AB 12 o 19 . where A is a cation with a radius close to that of an oxygen ion, such as Ba 2+ 、Sr 2+ , Pb 2+ etc., B is a trivalent cation, such as Fe, Al, Mn, etc. The crystal structure of this kind of compound is the same type as that of magnetoplumbite ore, which belongs to the space group of hexagonal crystal system, and the chemical composition of natural magnetoplumbite ore is approximately Pb (Fe 7.5 , Mn 3.5 、Al 0.5 、Ti 0.5 )O 19 . [0003] The artificial permanent ferrite is firstly the cubic cobalt ferrite successfully developed by Kato and Takei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 葛一航
Owner 浙江省东阳市中航磁性有限公司
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