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Dendritic iron nitride powder and preparation method thereof

A technology of iron nitride and powder, which is applied in the field of dendritic iron nitride powder and its preparation, can solve the problems of high production cost, complex process, and lack of micro-nano structure, and achieve low production temperature, simple process and equipment, The effect of low production cost

Active Publication Date: 2014-12-10
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Common problems in the above methods: (1) iron nitride powder is simple spherical or granular, does not have special anisotropic morphology, and cannot realize the special properties brought by it; (2) iron nitride powder is micron Level or nanoscale, without micro-nano structure; (3) cumbersome reaction device, complicated process, high production cost
Although dendritic iron oxides and sulfides have also been studied, no one has studied dendritic iron nitride. According to our current research, the method of ordinary dendritic iron oxides and sulfides can be applied to dendritic nitrogen. In the preparation of iron oxide, it is impossible to prepare dendritic iron nitride at all. What kind of process range can prepare iron nitride that maintains dendrites? This is the main technical problem at present.

Method used

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  • Dendritic iron nitride powder and preparation method thereof
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  • Dendritic iron nitride powder and preparation method thereof

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Effect test

Embodiment 1

[0038] The steps for preparing dendritic iron nitride powder are as follows: first, use deionized water to prepare K with a concentration of 0.1mol / L 3 [Fe(CN) 6 ] (potassium ferricyanide) aqueous solution, the aqueous solution pH=12 was adjusted with sodium hydroxide. Stir at room temperature for 10 minutes to become a clear solution. Pour 70ml of the solution into a 100ml stainless steel reaction kettle lined with polytetrafluoroethylene, tighten the lid of the reaction kettle, put the reaction kettle into an oven, and heat at 140°C. The heat preservation time is 24 hours. After naturally cooling to room temperature, the reaction product was taken out, the resulting red precipitate was centrifuged, washed five times with deionized water and absolute ethanol, and dried at 60°C to obtain dendritic ferric oxide powder.

[0039] Put the obtained ferric oxide powder into the nitriding furnace, first pass nitrogen gas to evacuate, then pass through ammonia gas, raise the tempera...

Embodiment 2

[0041] The steps for preparing dendritic iron nitride powder are as follows: firstly, deionized water is used to prepare K 3 [Fe(CN) 6 ] (potassium ferricyanide) aqueous solution, adjust the aqueous solution pH=14 with ammonia water. Stir at room temperature for 10 minutes to become a clear solution. Pour 70ml of the solution into a 100ml stainless steel reaction kettle lined with polytetrafluoroethylene, tighten the lid of the reaction kettle, put the reaction kettle into an oven, and heat at 150°C. The heat preservation time is 48 hours. After naturally cooling to room temperature, the reaction product was taken out, the resulting red precipitate was centrifuged, washed with deionized water and absolute ethanol five times each, and dried at 60°C to obtain dendritic ferric oxide powder.

[0042] Put the obtained ferric oxide powder into the nitriding furnace, first pass nitrogen gas to evacuate, then pass through ammonia gas, raise the temperature to 520°C, adjust the nitro...

Embodiment 3

[0044] The steps for preparing dendritic iron nitride powder are as follows: first, deionized water is used to prepare K with a concentration of 0.15mol / L 3 [Fe(CN) 6 ] (potassium ferricyanide) aqueous solution, adjust the aqueous solution pH=8 with ammonia water. Stir at room temperature for 10 minutes to become a clear solution. Pour 350ml of the solution into a 500ml stainless steel reaction kettle lined with polytetrafluoroethylene. Tighten the lid of the reaction kettle, put the reaction kettle into an oven, and heat at 180°C. The heat preservation time is 48 hours. After naturally cooling to room temperature, the reaction product was taken out, the resulting red precipitate was centrifuged, washed with deionized water and absolute ethanol five times each, and dried at 60°C to obtain dendritic ferric oxide powder.

[0045] Put the obtained ferric oxide powder into a tube furnace, first pass nitrogen to evacuate, and then pass a mixed gas of ammonia and hydrogen (volume ...

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Abstract

The invention discloses a dendritic iron nitride powder and a preparation method thereof. The microstructure of the dendritic iron nitride powder has anisotropy, is in a dendritic shape, and is composed of a micron-scale trunk structure and a nano-scale branch structure. The dendritic iron nitride powder is composed of a gamma'-Fe4N or epsilon-Fe3N single phase, or any two or more of gamma'-Fe4N, epsilon-Fe3N and Fe. The length of the micron-scale trunk structure is 3-10 mu m, the length of the nano-scale branch structure is 200nm-2 mu m, and the diameter of the branch structure is 50-400nm. Dendritic ferric oxide used as a precursor is subjected to a reduction nitriding one-step process to obtain the dendritic iron nitride powder. The iron nitride powder can implement special optical, electric, magnetic, catalytic and other physicochemical properties which can not be implemented by the common spherical iron nitride powder, and especially has important application value in the field of stealth materials.

Description

technical field [0001] The invention relates to dendritic iron nitride powder and a preparation method thereof, belonging to the technical field of powder material preparation. technical background [0002] Iron nitride (γ′-Fe 4 N, ε-Fe 3 N, α″-Fe 16 N 2 ) Magnetic powder is a new type of strong magnetic material, which has various and special application values ​​in the fields of electronics industry, chemical industry and national defense high technology. Compared with the commonly used magnetic recording material γ-Fe 2 o 3 Compared with iron nitride magnetic powder, it has the advantages of high recording density, high signal-to-noise ratio, good chemical stability, corrosion resistance and wear resistance. Nanoscale iron nitride is an ideal raw material for preparing wave-absorbing materials, magnetic liquids and magnetic devices. In addition, iron nitride with a nanostructure is also a very efficient catalyst. Therefore, the research and development of iron nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06
Inventor 于美杰王成国许文花毛琼李发展
Owner SHANDONG UNIV
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