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Calcium permanent magnetic ferrite material and preparation method thereof

A permanent magnet ferrite and raw material technology, applied in the field of magnetic functional materials, can solve the problems that the formation system technology and industrial production have not been reported, and there are many research reports on calcium ferrite, so as to promote technological development, low cost, The effect of high magnetic performance

Inactive Publication Date: 2012-06-20
浙江凯文磁钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are many research reports on calcium ferrite, but there are no reports on the formation of system technology and industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to the formula of isotropic calcium ferrite [CaO.5.9Fe 2 o 3 ] Weigh various raw materials, then add 2.8% La 2 o 3 , SiO 2 0.4% as a primary additive, after mixing evenly and pressing into a briquette cake, the green density is 2.7g / cm 3 , under the protection of more than 5% oxygen, the highest temperature in the kiln is 1180°C±10°C, and the temperature is kept for 2 hours for solid-phase reaction (also known as pre-burning process). : ball: water ratio of 1:9:1.3 is finely crushed to a particle size of 0.87ц, and the discharged material is deposited on the press and pumped into the mold. The molding pressure is 400kg / c㎡, and the green density is 3.3g / cm2 3 Forming, green body size Ф50×15mm, sintered at 1200°C±10°C in a kiln with an oxidizing atmosphere above 5%, and tested by grinding, the magnetic performance parameters are: Br: 220mT, Hcb: 159.4KA / m, Hcj: 201.7KA / m, (BH)max: 9.233KJ / M 3 , The upper limit value of the performance parameter value of th...

Embodiment 2

[0042] According to the formula of anisotropic calcium ferrite [CaO 0.5 .SrO 0.5 ].6Fe 2 o 3Weigh various raw materials, then add 0.6% SiO 2 The weight ratio is used as an additive. After mixing evenly, it is pressed into a honeycomb green body with a green density of 2.8g / cm 3 , in a kiln with an oxidizing atmosphere above 5% at a high temperature of 1200±10°C for 2 hours for solid-state reaction (also known as pre-burning). : The ratio of water is 1:9:1.3 and it is finely crushed to a particle size of 0.83ц, and the discharged material is deposited on the press in the mold with an orientation magnetic field of 480KA / M, a pumping pressure of 500kg / c㎡, and a green density of 3.4g / cm 3 Forming, green body size Ф50×15mm, sintered at 1220°C±10°C in a kiln with an oxidizing atmosphere above 5%, after grinding and testing, the magnetic parameters are: Br: 395mT, Hcb: 225KA / m, Hcj: 235KA / m,(BH)max:28.5KJ / m 3 , It reaches the magnetic performance parameters of the internationa...

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Abstract

The invention provides a calcium permanent magnetic ferrite material and a preparation method thereof. The calcium permanent magnetic ferrite material of the invention is a hexaplanar permanent magnetic ferrite material utilizing Ca as one of main raw materials, the molecular formula thereof is [CaOx(SrO)1-x].(5.5-6.5)Fe2O3, wherein X is not smaller than 0.5 while not larger than 1. The calcium permanent magnetic ferrite material of the invention has the advantages of having low cost, saving the energy source, prolonging the service life of a kiln and increasing the yield of the kiln; the residual magnetism Br of the calcium ferrite material of the invention is high, and the coercive force thereof is low than that of strontium ferrite, so that the calcium ferrite material is suitable to be used in sound boxes, microphones and sensors of magnetic circuits with small air gaps and closed magnetic circuits.

Description

technical field [0001] The invention belongs to magnetic functional materials, in particular to a calcium permanent magnet ferrite material and a preparation method. 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 compound is the same type as that of magnetoplumbite ore, and belongs to the hexagonal crystal system space group. The chemical composition of natural magnetoplumbite ore is approximately Pb(Fe 7.5 mn 3.5 AI 0.5 Ti 0.5 )O 19 . [0003] The artificial permanent ferrite is firstly the cobalt ferrite of the cubic crystal system successfully developed by Kato and Takei in 1933. In 1938, Kochat determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 卢杨成赵国法
Owner 浙江凯文磁钢有限公司