Preparation method of nanometer strontium ferrite magnetic powder

A ferrite magnet and nano-strontium technology, which is applied in the field of preparation of nano-strontium ferrite magnetic powder, achieves the effects of small product particle size, short reaction cycle and uniform distribution

Inactive Publication Date: 2010-12-15
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the sol-gel method, there is no report on the preparation of na...

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  • Preparation method of nanometer strontium ferrite magnetic powder
  • Preparation method of nanometer strontium ferrite magnetic powder
  • Preparation method of nanometer strontium ferrite magnetic powder

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Embodiment 1

[0021] The preparation of embodiment 1 nanometer strontium ferrite magnetic powder

[0022] Take by weighing 20.1420g ferric nitrate crystal namely Fe(NO 3 ) 3 9H 2 O, dissolved in 50ml deionized water, weighed 0.6169g strontium carbonate (SrCO 3 ) add a small amount of nitric acid solution dropwise until completely dissolved, and mix and stir the strontium carbonate solution and ferric nitrate solution evenly. The molar ratio of Sr to Fe in the above mixed solution is 1:12. Dissolve 8.1327g of tartaric acid in the mixed solution, and then add 0.5601g of polyethylene glycol-2000 and stir to dissolve after it is completely dissolved. Then the pH value of the solution was adjusted to 7 with ammonia water to obtain a reddish-brown mixed solution. The reddish-brown mixed solution is first heated and stirred at 50°C to form a sol, then the temperature is raised to 70-80°C to form a gel from the sol, and then dried in an oven at 80-90°C for 24 hours to form a xerogel. Put the ...

Embodiment 2

[0023] The preparation of embodiment 2 nanometer strontium ferrite magnetic powder

[0024] Take by weighing 20.1965g ferric nitrate crystal namely Fe(NO 3 ) 3 9H 2 O was dissolved in 50ml deionized water, weighed 0.6151g strontium carbonate (SrCO 3 ) add a small amount of nitric acid solution dropwise until completely dissolved, and mix and stir the strontium carbonate solution and ferric nitrate solution evenly. The molar ratio of Sr to Fe in the above mixed solution is 1:12. Dissolve 8.1337g of tartaric acid in the mixed solution, and then add 0.6104g of polyethylene glycol-2000 and stir to dissolve after it is completely dissolved. Then the pH value of the solution was adjusted to 7 with ammonia water to obtain a reddish-brown mixed solution. First heat and stir the reddish-brown mixture at 50°C to form a sol, then raise the temperature to 70-80°C to make the sol form a gel, and then dry it in an oven at 80-90°C for 24 hours to form a xerogel. Put the dry gel into a ...

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Abstract

The invention relates to the production of magnetic materials, in particular to a preparation method of nanometer strontium ferrite magnetic powder (SrFe12O19), comprising the following specific steps of: weighting strontium carbonate and ferric nitrate crystal according to the mole ratio of 1:12 of Sr and Fe, solving the strontium carbonate and the ferric nitrate crystal by nitric acid and deionized water, adding tartaric acid and polyethylene glycol after evenly mixing, and regulating the pH value to be 7 by using ammonia water; and heating the obtained mixed liquid to be sol-gel, drying the sol-gel, and carrying out the sectional roasting on the dried sol-gel at 860-1,100 DEG C to prepare powdery magnetic nanometer strontium ferrite. Due to the synergistic effect of the polyethylene glycol, the tartaric acid is used for the first time as a main complexing agent to prepare strontium ferrite so that a precursor directionally grows up, the anisotropy is increased and the saturation magnetization strength Ms is improved. The test shows that the crystallite dimension is 20-45nm, the saturation magnetization strength Ms is 78.4emu/g, and the intrinsic coercivity is 3163.3G. The excellent performance of the magnetic powder is suitable for automobile motor magnets and magnetic recording media materials.

Description

technical field [0001] The invention relates to the manufacture of magnetic materials, in particular to nano strontium ferrite magnetic powder (SrFe 12 o 19 ) preparation method. Background technique [0002] Nano strontium ferrite powder (SrFe 12 o 19 ) has high coercive force and saturation magnetization, and is widely used in permanent magnet materials, microwave absorbing materials and high-density perpendicular magnetic recording medium materials because of its stable chemical properties. The sol-gel method is a common method for preparing nano-magnetic strontium ferrite. It has the characteristics of uniform raw material mixing, low sintering temperature, easy control of product composition and ion replacement, small particle size, narrow particle size distribution and excellent magnetic properties. . The amount of strontium ferrite in the strontium carbonate industry ranks second, and it is widely used in motors, computers, network information, communications, ae...

Claims

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Application Information

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IPC IPC(8): C04B35/26
Inventor 刘成伦丁世环徐龙君王星敏谢太平
Owner CHONGQING UNIV
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