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Single-domain adding calcium permanent magnetic ferrite and preparation method thereof

A technology of permanent magnet ferrite and single domain, applied in the field of ferrite material and its preparation, can solve the problems of high cost, low purity of ferrite phase, uneven particle size distribution of ferrite powder, etc. Achieve the effect of improving the qualified rate of finished products, meeting industrial production requirements, and shortening the molding cycle

Inactive Publication Date: 2015-05-13
ANHUI SINOMAG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these patented technologies are reflected in the one-time doping of lanthanum and cobalt, which is costly. In the actual operation of the existing technology, the particle size distribution of ferrite powder is not uniform, the purity of the ferrite phase is not high, and it contains some miscellaneous items, such as α-Fe 2 o 3 、LaFe 11 CoO 19 Wait

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The acid treatment refines the Sr 2+ , Ca 2+ , La 3+ 、Co 2+ Benzene acidified substance powder is compounded to make its composition reach Z 1-x A x [Fe 12-y m y ] z o 19 (x=0.2, y=1.1, z=0.5) basic components, in addition, add 0.6% SiO in the complex 2 , and 0.1% H 3 BO 3 , after mixing by ball milling, dry in a drying oven for 48 hours, and finally pre-fire and keep warm at 1240°C for 0.75h, and coarsely pulverize the pre-fired powder with a vibrating mill to obtain a coarse powder with a particle size of 4 μm. Take 1kg of coarse powder, add 2kg of water and CaCO 3 18g,Al 2 o 3 10 g of kaolin and 3 g of kaolin were put into a ball mill for wet grinding to obtain ferrite slurry with an average particle size of 0.75 μm. The slurry was formed in a 997KA / m magnetic field, and the green body was sintered at an atmospheric temperature of 1220°C for 0.78h. The sintered sample was cut into a cylinder of 20mmx20mm, and the magnetic properties were measured by VSM...

Embodiment 2

[0026] The acid treatment refines the Sr 2+ , Ca 2+ , La 3+ 、Co 2+ Benzene acidified substance powder is compounded to make its composition reach Z 1-x A x [Fe 12-y m y ] z o 19 (x=0.2, y=1.1, z=0.5) basic components, in addition, add 0.6% SiO in the complex 2 , and 0.1% H 3 BO 3 , After ball milling and mixing, dry in a drying oven for 48 hours, and finally pre-fire at 1240°C for 0.75h. The pre-fired powder is coarsely pulverized by a vibrating mill to obtain a coarse powder with a particle size of 4 μm. Take 1kg of coarse powder, add 2kg of water and CaCO 3 15g,Al 2 o 3 5 g of kaolin and 2 g of kaolin were put into a ball mill for wet grinding to obtain ferrite slurry with an average particle size of 0.75 μm. The slurry was formed in a 997KA / m magnetic field, and the green body was sintered at an atmospheric temperature of 1220°C for 0.78h. The sintered sample was cut into a cylinder of 20mmx20mm, and the magnetic properties were measured by VSM. The propertie...

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Abstract

The invention discloses a nano liquid phase adding calcium series permanent magnetic ferrite and a preparation method thereof, the molecular structure of the ferrite material is Z1-xAx [Fe12-yMy] zO19, wherein Z is a composition of one or two of Sr, Ca or Ba in proportion, M is one or a plurality substances selected from the group consisting of Ni, Co and Ga, the ranges of x, y and z are as follows: 0.0 <= x <= 0.30, 0.0<= y <=1.7, and 0.0 <= z <= 0.9. By use of a liquid phase acidizing additive, the nano liquid phase adding calcium series permanent magnetic ferrite can be sintered in a low oxygen atmosphere, and still keeps higher magnetic property, compared with traditional process, the range of the ferrite sintering temperature becomes wider; and finally the product molding cycle is shortened, and the finished product passing rate is increased dramatically.

Description

technical field [0001] The invention relates to a ferrite material and a preparation method thereof, in particular to a single-domain added calcium-based permanent magnet ferrite and a preparation method thereof. technical background [0002] With the development of microelectronics technology, the requirements for the magnetic performance parameters of permanent magnet ferrite are getting higher and higher, such as high saturation magnetic flux density, high intrinsic coercive force, high magnetic energy level, etc. At present, the existing permanent magnet ferrite technology mainly embodies one-time addition of lanthanum and cobalt, such as Chinese patent applications (CN 103408296A) (CN 102898127A), CN103030388A) and so on. Most of these patented technologies are reflected in the one-time doping of lanthanum and cobalt, which is costly. In the actual operation of the existing technology, the particle size distribution of ferrite powder is not uniform, the purity of the fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 刘野熊言傲
Owner ANHUI SINOMAG TECH