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La-Zn co-doping permanent magnetic strontium ferrite material powder and preparation method thereof

A strontium ferrite and co-doping technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of difficult industrial production of nano-powder, unprovided magnetic properties of material powder, and unfavorable industrial production. , to achieve the effect of excellent permanent magnet performance, scientific scheme and uniform particle size

Inactive Publication Date: 2014-03-12
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

La-Zn-substituted M-type strontium ferrite (Bao Hengwei et al. Magnetic properties and phase transition process of La-Zn-substituted M-type strontium ferrite nanoparticles[J]. Magnetic Materials and Devices, 2004, No. 3: 22 -25.) reported that although La-Zn doped strontium ferrite nanoparticles were synthesized by sol-gel method, the industrial production of nanopowders was difficult and the production cost was extremely high
Substitution of La-Zn for permanent strontium ferrite powder (Lian Jiangbin et al. Effect of La-Zn substitution on the structure and properties of permanent strontium ferrite powder[J]. Magnetic Materials and Devices, 2011, No. 3: 53- 55. ) reported the effects of different calcination temperatures on the characteristics of magnetic powder such as average density, compressed density and melt fluidity, but did not give specific data on the magnetic properties of the material powder
La-Zn substituted strontium ferrite nanofibers (Shen.X.Q et al. Effect of La-Zn substitution on the microstructure and magnetic properties of strontium ferrite nanofibers[J]. Applied Physics Series A: Materials Science and Processing, 2011, No. 104: 109-116.) reported that nano-strontium ferrite fibers were synthesized by electrospinning, the saturation magnetization reached 71emu / g, and the coercive force was 420KA / m; although it has good magnetic Can, but the production of nanofibers by electrospinning requires high equipment, which is not conducive to industrial production

Method used

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  • La-Zn co-doping permanent magnetic strontium ferrite material powder and preparation method thereof
  • La-Zn co-doping permanent magnetic strontium ferrite material powder and preparation method thereof
  • La-Zn co-doping permanent magnetic strontium ferrite material powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A La-Zn co-doped permanent magnet strontium ferrite powder and a preparation method thereof. Iron scale and strontium carbonate are used as raw materials, lanthanum oxide and zinc oxide are used as dopants, and the raw materials and the dopants are made of SrCO 3 : Fe 2 o 3 :La 2 o 3 : The molar ratio of ZnO is (0.81~0.9) : (5.94~5.98) : (0.05~0.09) : (0.06~0.12) to form a mixture, and 0.1~0.2wt% of the polyethylene glycol and the The water of 90 ~ 95wt% of the mixture is prepared into a slurry; then according to the mass ratio of the steel ball and the mixture (7.5 ~ 8.0): 1, the slurry is wet-milled in a steel ball mill, and wet-milled to The particle size is 0.6~0.9μm; then the ball-milled slurry is placed in a rotary kiln, and the temperature is raised to 1000~1050°C at a heating rate of 2~5°C / min, kept for 120~240 minutes, and cooled with the kiln to obtain La- Zn co-doped permanent magnet strontium ferrite powder.

[0022] The La-Zn co-doped permanent magnet...

Embodiment 2

[0024] A La-Zn co-doped permanent magnet strontium ferrite powder and a preparation method thereof. Iron scale and strontium carbonate are used as raw materials, lanthanum oxide and zinc oxide are used as dopants, and the raw materials and the dopants are made of SrCO 3 : Fe 2 o 3 :La 2 o 3 : The molar ratio of ZnO is (0.74~0.81) : (5.91~5.94) : (0.09~0.13) : (0.12~0.18) to form a mixture, plus 0.2~0.3wt% sorbitol and the Mix 95~100wt% of water to make a slurry; then wet grind the slurry in a steel ball mill tank according to the mass ratio of steel balls and mixture (8.0~8.5): 1, and wet grind to particle size 0.6~0.9μm; then put the ball-milled slurry into a rotary kiln, raise the temperature to 1050~1100℃ at a heating rate of 5~10℃ / min, keep it for 120~240 minutes, and cool down with the kiln to get La-Zn Co-doped permanent magnet strontium ferrite powder.

[0025] The La-Zn co-doped permanent magnet strontium ferrite powder prepared in this example is tested: the coe...

Embodiment 3

[0027] A La-Zn co-doped permanent magnet strontium ferrite powder and a preparation method thereof. Iron scale and strontium carbonate are used as raw materials, lanthanum oxide and zinc oxide are used as dopants, and the raw materials and the dopants are made of SrCO 3 : Fe 2 o 3 :La 2 o 3: The molar ratio of ZnO is (0.67 ~ 0.74): (5.88 ~ 5.91) : (0.13 ~ 0.17): (0.18 ~ 0.24) is made into a mixture, plus 0.3 ~ 0.4wt% calcium gluconate and the The water of 100 ~ 105wt% of the mixture is used to prepare the slurry; then according to the mass ratio of the steel ball and the mixture (8.5 ~ 9): 1, the slurry is wet-milled in a steel ball mill, and wet-milled to The particle size is 0.6~0.9μm; then put the ball-milled slurry into a rotary kiln, raise the temperature to 1100~1150℃ at a heating rate of 10~15℃ / min, keep it warm for 120~240 minutes, and cool down with the kiln to get La- Zn co-doped permanent magnet strontium ferrite powder.

[0028] The La-Zn co-doped permanent m...

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Abstract

The invention relates to La-Zn co-doping permanent magnetic strontium ferrite material powder and a preparation method thereof. According to the technical scheme, strontium carbonate, iron scale, lanthanum oxide and zinc oxide are mixed to obtain a mixture, wherein the molar ratio of SrCO3:Fe2O3:La2O3:ZnO is (0.6-0.9):(5.85-5.98):(0.05-0.20):(0.06-0.30); and then, 0.1-0.5wt% of dispersing agent and 90-110wt% of water are added to the mixture to prepare the slurry; then the slurry is wet milled in a steel ball-milling tank according to the mass ratio of the steel balls to the mixture being (7.5-10):1 till the granularity is 0.6-0.9mu m; and then the ball-milled slurry is put into a rotary kiln, heat insulation is carried out for 120-240 minutes under the condition of 1000-1350 DEG C, and the sully is cooled along with the kiln, thereby obtaining the La-Zn co-doping permanent magnetic strontium ferrite material powder. The preparation method is simple in process and low in cost; and the prepared La-Zn co-doping permanent magnetic strontium ferrite material powder has the coercive force of 160-320kA / m, residual magnetization of 215-300mT, saturation magnetization of 58-66emu / g, and excellent permanent magnetic performance.

Description

technical field [0001] The invention belongs to the field of permanent magnet ferrite materials, in particular to a La-Zn co-doped permanent magnet strontium ferrite material powder and a preparation method thereof. Background technique [0002] M-type hexagonal strontium ferrite has high coercive force, large saturation magnetization, high residual magnetization and high chemical stability, and is widely used in televisions, air conditioners, computers, magnetic recorders, magnetic separation With separation, in cars and electric vehicles. [0003] In order to improve the inherent magnetic properties of strontium ferrite, especially the magnetic energy product, ion substitution is adopted at home and abroad. For example, the substitution mode of single ion La or Pr, the substitution mode of polyion La-Co, or La-Cu or La-Zn, etc. The study found that the multi-ion substitution can improve the super-exchange effect in the magnet and improve the magnetic performance. For ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C01G49/00
Inventor 李享成赵章朱伯铨
Owner WUHAN UNIV OF SCI & TECH
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