Preparation method of permanent magnetic ferrite

A technology of permanent magnet ferrite and strontium ferrite, which is applied in the field of preparation to improve the comprehensive performance of permanent magnet ferrite, and can solve problems such as the decrease of remanence

Active Publication Date: 2013-08-28
南通飞来福磁铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these additives are: CaCO3, CaO and some rare earth oxidation additives increase the remanence while the material coercive force and intrinsic coercive force also decrease; Al, 2O3, SiO2, Cr2O3, SrCO3, H3BO3 and other additives in While improving the coercive force and intrinsic coercive force of the material, the remanence also drops sharply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of permanent ferrite, comprising the following steps, (1) batching: batching is carried out according to the following raw materials in parts by weight: permanent barium ferrite: 100 parts, the composition of permanent barium ferrite is BaO: 35mol%, Fe 2 o 3 : 65mol%; CaCO 3 : 1.6 parts, SiO 2 : 0.2 parts, H 3 BO 3 : 1.2 parts, La 2 o 3 : 1.6 parts, Co 2 o 3 : 1.6 parts; the CaCO 3 , SiO 2 、H 3 BO 3 Both are powders below 200 nanometers; (2) Mixing: put the raw material powder weighed in step (1) into a planetary ball mill for ultra-fine ball milling under vacuum conditions, and add 3.5mm steel balls, water and carbonic acid to the ball mill Ammonium hydrogen, by mass, steel ball: raw material powder: water: ammonium bicarbonate: 10: 1: 2: 0.005, the control ball milling speed is 250r / min, ball milling 20 hours makes the particle size of raw material powder less than 2 μ m; Drying of the powder; (3) pre-sintering of pellets: pre-sinteri...

Embodiment 2

[0029] A preparation method of permanent ferrite, comprising the following steps, (1) batching: batching according to the following raw materials in parts by weight: permanent magnet strontium ferrite: 100 parts, the composition of permanent magnet strontium ferrite is SrO: 20mol%, Fe 2 o 3 : 80mol%; CaCO 3 : 1.7 parts, SiO 2 : 0.5 parts, H 3 BO 3 : 1.3 parts, La 2 o 3 : 1.7 parts, Co 2 o 3 : 1.7 parts; the CaCO 3 , SiO 2 、H 3 BO 3 Both are powders below 200 nanometers; (2) Mixing: put the raw material powder weighed in step (1) into a planetary ball mill for ultra-fine ball milling under vacuum conditions, and add 5mm steel balls, water and bicarbonate into the ball mill Ammonium, by mass, steel ball: raw material powder: water: ammonium bicarbonate: 10: 1: 2: 0.005, control the ball milling speed to be 150r / min, ball mill for 28 hours, so that the particle size of the raw material powder is not greater than 1 μm; then the raw material Drying of the powder; (3) P...

Embodiment 3

[0032] A preparation method of permanent magnet ferrite, comprising the following steps, (1) batching: batching is carried out according to the following raw materials in parts by weight: permanent magnet strontium barium ferrite: 100 parts, the composition of permanent magnet strontium barium ferrite is SrO: 9mol%, BaO: 13mol%, Fe 2 o 3 : 78mol%, CaCO 3 : 1.8 parts, SiO 2 : 0.8 parts, H 3 BO 3 : 1.4 parts, La 2 o 3 : 1.8 parts, Co 2 o 3 : 1.8 parts; the CaCO 3 , SiO 2 、H 3 BO 3 All are powders below 200 nanometers; (2) Mixing: put the raw material powder weighed in step (1) into a planetary ball mill for ultrafine ball milling under nitrogen protection conditions, and add 5mm steel balls, water and carbonic acid in the ball mill Ammonium hydrogen, by mass, steel ball: raw material powder: water: ammonium bicarbonate: 10: 1: 2: 0.005, the control ball milling speed is 380r / min, ball milling 22 hours, makes the particle size of raw material powder be no more than 1 ...

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Abstract

The invention relates to a preparation method of permanent magnetic ferrite. The preparation method comprises the following steps of: burdening; mixing; pelletizing and pre-sintering; crushing; forming; sintering; and cooling to obtain the permanent magnetic ferrite. Through selecting raw materials, optimizing a technological parameter, such as controlling a pulverizing process, controlling a forming parameter, controlling a sintering schedule, controlling a cooling process, and the like in a preparation process, particularly, controlling ball-milling and secondary ball-milling process parameters, the residual magnetism Br of sintered ferrite is not less than 500mT, the coercive force Hcb of the sintered ferrite is not less than 310kA/m, the intrinsic coercive force Hcj of the sintered ferrite is not less than 410kA/m, and the maximum magnetic energy product (BH)max of the sintered ferrite is not less than 35kJ/m<3>.

Description

technical field [0001] The invention relates to a preparation method for improving the comprehensive performance of permanent magnet ferrite. Background technique [0002] With the rapid development of the automobile industry, high-performance automobile motors have higher and higher requirements on the performance of permanent ferrite. In order to meet the market demand, in recent years, after the Japanese TDK company, the ace company in the ferrite industry, launched the FB9 and FB12 series of high-performance permanent magnet ferrite products, there has been a rapid development of high-tech ferrite companies in the global ferrite industry. Performance permanent ferrite boom. Various manufacturers have explored ways to improve the magnetic properties of permanent ferrites from the aspects of raw materials, secondary additions, and production processes. The microstructure characteristics of high-performance permanent ferrite materials are: the crystal grains are small and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622
Inventor 周连明周园园程爱军
Owner 南通飞来福磁铁有限公司
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