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Method for preparing high saturation magnetisation CoFe alloy powder by using hydrotalcite as single precursor

A technology of magnetization and hydrotalcite, applied in the direction of magnetic objects, magnetic materials, circuits, etc., can solve the problems of complex preparation process, uneven diffusion, and environmental hazards of CoFe polymer precursors, so as to avoid diversification of metal sources and crystallization. The effect of complete particle structure and precise chemical ratio

Inactive Publication Date: 2010-11-03
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

The disadvantage is that a multi-precursor mixed system is used, the metal source is diversified, and there is a phenomenon of uneven diffusion during the reduction process.
Girija S.Chaubey, CariosBarcena, etc., J.Am.Chem.Soc.2007, 129, 7214-7215 solved this problem, and the obtained alloy has a significant improvement in magnetic properties, but because the raw materials adopt Co, Fe Complexes, organic additives such as surfactants need to be added during the reduction process, and there is a risk of environmental pollution
The organic single precursor method (Kun Liu, Scott B. Clendenning et al., Chem. Mater. 2006, 18, 2591-2601) developed to solve the different sources of Co and Fe metals has realized the unity of CoFe metal sources. Based on this method The synthesized alloy has highly dispersed metal atoms, complete crystal form, and controllable grain size and distribution within a certain range, but the preparation process of the CoFe polymer precursor is complicated, costly, and also has environmental hazards

Method used

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  • Method for preparing high saturation magnetisation CoFe alloy powder by using hydrotalcite as single precursor
  • Method for preparing high saturation magnetisation CoFe alloy powder by using hydrotalcite as single precursor
  • Method for preparing high saturation magnetisation CoFe alloy powder by using hydrotalcite as single precursor

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Experimental program
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Effect test

Embodiment 1

[0020] Weigh 43.5g of Co(NO 3 ) 2 ·6H 2 O and 30.3g of Fe(NO 3 ) 3 9H 2 O to join to CO 2 Water is configured into a 150ml mixed solution, and another 18g of NaOH is weighed and added to remove CO 2 Water is configured into 150ml alkali solution. The two were uniformly mixed under high-speed stirring at 3000 rpm, and the resulting slurry had a pH of 6.8, and was stirred and crystallized at 80°C and 200 rpm for 24 hours. After crystallization, the slurry was cooled and filtered to remove CO 2 Washing with water, centrifugation, and the resulting precipitate were repeated four times, and dried at 60°C for 24 hours to obtain Co 0.63 Fe 0.37 (OH) 2 (NO 3 ) 0.37 2H 2 O. After grinding, weigh 0.15g of hydrotalcite precursor, spread it evenly on a porcelain boat and place it in a tube furnace. 2 / N 2 5% reducing atmosphere, cross-sectional air flow 40ml / cm 2 Under the condition of min, the temperature is programmed to rise at 5°C / min, and the temperature is kept at 6...

Embodiment 2

[0022] Weigh 39.1g of Co(NO 3 ) 2 ·6H 2 O and 36.3g of Fe(NO 3 ) 3 9H 2 O to join to CO 2 Water is configured into a 150ml mixed solution, and another 18g of NaOH is weighed and added to remove CO 2 Water is configured into 150ml alkali solution. The two were uniformly mixed under high-speed stirring at 3000 rpm, and the resulting slurry had a pH of 7.1, and was stirred and crystallized at 40°C and 200 rpm for 24 hours. After crystallization, the slurry was cooled and filtered to remove CO 2 Washing with water, centrifugation, and the resulting precipitate were repeated four times, and dried at 60°C for 24 hours to obtain Co 0.54 Fe 0.46 (OH) 2 (NO 3 ) 0.46 2H 2 O. After grinding, weigh 0.15g of hydrotalcite precursor, spread it evenly in a porcelain boat and place it in a tube furnace. 2 / N 2 5% reducing atmosphere, cross-sectional air flow 40ml / cm 2 Under the condition of min, the temperature is programmed to rise at 5°C / min, and the temperature is kept at 6...

Embodiment 3

[0024] Weigh 58.7g of Co(NO 3 ) 2 ·6H2 O and 27.3g of Fe(NO 3 ) 3 9H 2 O to join to CO 2 Water is configured into a 150ml mixed solution, and another 21.6g of NaOH is weighed and added to remove CO 2 Water is configured into 150ml alkali solution. The two were uniformly mixed under high-speed stirring at 3000 rpm, and the resulting slurry had a pH of 7.0, and was stirred and crystallized at 40°C and 200 rpm for 24 hours. After crystallization, the slurry was cooled and filtered to remove CO 2 Washing with water, centrifugation, and the resulting precipitate were repeated four times, and dried at 60°C for 24 hours to obtain Co 0.54 Fe 0.46 (OH) 2 (NO 3 ) 0.46 2H 2 O. After grinding, weigh 0.15g of hydrotalcite precursor, spread it evenly in a porcelain boat and place it in a tube furnace. 2 / N 2 5% reducing atmosphere, cross-sectional air flow 40ml / cm 2 Under the condition of min, the temperature is programmed to rise at 5°C / min, and the temperature is kept at 6...

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Abstract

The invention relates to a method for preparing high saturation magnetisation CoFe alloy powder by using hydrotalcite as a single precursor, which belongs to the technical field of a metal soft magnetThe invention relates to a method for preparing high saturation magnetisation CoFe alloy powder by using hydrotalcite as a single precursor, which belongs to the technical field of a metal soft magnetic material. The CoFe alloy powder can be prepared by calcining hydrotalcite precursor with the general chemical formula of Co1-bFeb(OH)2R<n->b / n.nH2O for 3 to 6 hours under the condition of 673-1073Kic material. The CoFe alloy powder can be prepared by calcining hydrotalcite precursor with the general chemical formula of Co1-bFeb(OH)2R<n->b / n.nH2O for 3 to 6 hours under the condition of 673-1073K in the environment with the ratio of H2 to N2 being 4-8 percent, wherein b in the Co1-bFeb(OH)2R<n->b / n.nH2O is b is more than or equal to 0.25 and is less than or equal to 0.5. Compared with the priin the environment with the ratio of H2 to N2 being 4-8 percent, wherein b in the Co1-bFeb(OH)2R<n->b / n.nH2O is b is more than or equal to 0.25 and is less than or equal to 0.5. Compared with the prior art, the invention has the advantages that the prepared CoFe alloy powder does not need to be ground in a ball milling mode, has the grain diameter of 20-150 nanometers, and accurate chemical propoor art, the invention has the advantages that the prepared CoFe alloy powder does not need to be ground in a ball milling mode, has the grain diameter of 20-150 nanometers, and accurate chemical proportion and complete grain structure, avoids the diversification of metal sources and lattice defect caused by powerful grinding and has superior magnetic property.rtion and complete grain structure, avoids the diversification of metal sources and lattice defect caused by powerful grinding and has superior magnetic property.

Description

technical field [0001] The invention belongs to the technical field of metal soft magnetic materials, in particular to a method for preparing CoFe alloy powder with high saturation magnetization by using hydrotalcite as a single precursor. Background technique [0002] CoFe alloy is a metal soft magnetic material, which is widely used in the manufacture of magnetic recording, sensors, ferrofluid and other functional components. At present, CoFe is mainly prepared by smelting method and chemical reduction method. Among them, the raw materials of the smelting method are molten Co and Fe, and the alloy is obtained through a physical alloying process. The traditional physical alloying process includes quick quenching method and atomization method. The production cost of the alloy produced by this method is low, but the process of producing alloy powder requires ball mill grinding, which consumes a lot of energy, the particle size is coarse, and it is difficult to control the al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/00C22C19/07H01F1/147
Inventor 王连英常安刘金凤何静
Owner BEIJING UNIV OF CHEM TECH
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