Preparation method of fibrous iron-nickel alloy powder

An iron-nickel alloy and fibrous technology, which is applied in the field of preparation of fibrous iron-nickel alloy powder, can solve the problems of unreported research and less research on fibrous iron-nickel alloy powder

Inactive Publication Date: 2008-12-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are very few studies on the preparation of fibrous iron-nickel alloy powder by co-precipitation method, and there are no reports on foreign related research.

Method used

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  • Preparation method of fibrous iron-nickel alloy powder
  • Preparation method of fibrous iron-nickel alloy powder
  • Preparation method of fibrous iron-nickel alloy powder

Examples

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preparation example Construction

[0021] figure 1 The preparation process of fibrous iron-nickel alloy powder is described:

[0022] ① firstly mix the soluble nickel salt and ferrous salt solution evenly in proportion, then mix the mixed solution with stoichiometric oxalic acid and ethylenediamine, polyvinylpyrrolidone (0.5wt%), citric acid (1wt%) and ascorbic acid (2wt%) %) The compound precipitant solution that constitutes is added in the reactor through feeding device, in Ni 2+ -Fe 2+ -H 2 NCH 2 CH 2 NH 2 -(H 3 NCH 2 CH2 NH 3 ) 2+ -SG n- -C 2 o 4 2- -H 2 Composite precipitation transformation is carried out in the O system, where SG n- Represents Cl - , SO 4 2- , NO 3 - 、CH 3 COO - , the temperature is controlled at 50-60°C, the pH is about 6.1, and the initial total concentration of iron-nickel ions in the feed liquid is 0.4-1.0mol / L

[0023] ② After the reaction is completed, the composite precipitate obtained after washing, filtering and drying is the precursor of the iron-nickel a...

Embodiment 1

[0030] The nickel-iron mol ratio is 1: 1 to be the nickel sulfate solution and the ferrous sulfate solution, and then the mixed solution is mixed with oxalic acid, ethylenediamine, polyvinylpyrrolidone (0.5wt%) (polyvinylpyrrolidone is analytically pure, and The composite precipitant solution that group chemical reagent factory produces), citric acid (1wt%) and ascorbic acid (2wt%) is added in the reactor through feeding device, in Ni 2+ -Fe 2+ -H 2 NCH 2 CH 2 NH 2 -(H 3 NCH 2 CH 2 NH 3 ) 2+ -SO 4 2- -C 2 o 4 2- -H 2 Coordination co-precipitation is carried out in the O system, the temperature is controlled at about 60°C, the pH is adjusted to about 6.1 with ethylenediamine, and the initial Ni in the feed solution 2+ and Fe 2+ The total concentration is 0.6mol / L, C 2 o 4 2- It is 0.72mol / L.

[0031] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of iron-nickel alloy powder. After tha...

Embodiment 2

[0033] The nickel-iron mol ratio is 7: 3 nickel chloride solution and ferrous chloride are uniformly mixed, then mixed solution is mixed with oxalic acid, ethylenediamine, polyvinylpyrrolidone (0.5wt%), citric acid (1wt%) and ascorbic acid (2wt%) The composite precipitant solution of composition adds in the reactor through feeding device, in Ni 2+ -Fe 2+ -H 2 NCH 2 CH 2 NH 2 -(H 3 NCH 2 CH 2 NH 3 ) 2+ -Cl - -C 2 o 4 2- -H 2 Coordination co-precipitation is carried out in the O system, the temperature is controlled at about 55°C, the pH is adjusted to about 6.1 with ethylenediamine, and the initial Ni in the feed solution 2+ and Fe 2+ The total concentration is 0.8mol / L, C 2 o 4 2- It is 0.88mol / L.

[0034] After the reaction is completed, the obtained composite precipitate is washed, filtered and dried to become the precursor of iron-nickel alloy powder. After that, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The ...

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Abstract

The invention relates to a preparation technology of a powder functional material, in particular to a preparation method of fibrous iron-nickel alloy powder. A coordinated coprecipitation-thermal decomposition-reduction process is adopted to synthesize a precursor coprecipitate product of the fibrous iron-nickel alloy powder in a Ni<2+>-Fe<2+>-H2NCH2CH2NH2-(H3NCH2CH2NH3)<2+>-SG<n->-C2O4<2->-H2O system at the normal temperature and pressure (SG<n-> stands for Cl<->, SO4<2->, NO3<-> and CH3COO<->), and the precursor is thermally decomposed and reduced under an weak reducing atmosphere to obtain the fibrous iron-nickel alloy powder; anti-oxidation treatment of surface of the fibrous iron-nickel alloy powder is carried out in the same device under the regulation and control of the temperature and atmosphere. The whole preparation process is safe, reliable, nontoxic and pollution-free. The iron-nickel alloy powder produced by the preparation method is fibrous and porous, and has small particle size, large specific surface area; and the iron-nickel alloy powder has strong oxidation resistance, and can meet requirements of a plurality of purposes.

Description

technical field [0001] The invention relates to a preparation process of powder functional materials, in particular to a preparation method of fibrous iron-nickel alloy powder. Background technique [0002] Fe-Ni alloy powder has many special properties different from single iron-nickel metal powder: melting point, ductility and thermal conductivity are reduced; hardness, strength, heat treatment performance, wear resistance and corrosion resistance are increased; synergy between components is enhanced And with special surface magnetism, etc., it has broad application prospects in magnetic materials, electromagnetic shielding and absorbing materials, hard alloys, alloy coatings, catalysts and anti-corrosion materials. Permalloy developed as early as the beginning of the last century is an iron-nickel alloy, and it is still a widely used soft magnetic material. The iron-nickel alloy thin film can be applied to magnetic recording medium materials, and the Ni80Fe20 alloy soft m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C22C38/08
Inventor 张传福张银亮湛菁邬建辉戴曦黎昌俊杨平樊友奇
Owner CENT SOUTH UNIV
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