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Graphene-coated variable phase nano magnetic composite material and preparation method thereof

A graphene-coated, nano-magnetic technology, applied in the direction of magnetic materials, inductors/transformers/magnets, magnetic objects, etc., can solve the problems affecting the development, application and preparation of graphene/carbon-coated iron and iron-nitrogen compound powders Strict conditions, complex test equipment, etc., to achieve the effect of mass production, short preparation process, and reduction of toxicity and environmental pollution

Active Publication Date: 2017-05-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] These methods have their own advantages, but also have many shortcomings, such as complex test equipment, strict preparation conditions, cumbersome process, etc., resulting in high preparation costs, which affect the production of graphene / carbon-coated iron and iron-nitrogen compound powders. Development and Application

Method used

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  • Graphene-coated variable phase nano magnetic composite material and preparation method thereof
  • Graphene-coated variable phase nano magnetic composite material and preparation method thereof
  • Graphene-coated variable phase nano magnetic composite material and preparation method thereof

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preparation example Construction

[0034] The preparation method of the ink olefin-coated variable-phase nano magnetic composite material provided by the present invention includes the following steps:

[0035] (1) After cleaning the reaction chamber of the plasma generator with inert gas continuously and several times, fill the entire reaction chamber with inert gas to isolate the air;

[0036] (2) After a stable inert gas plasma flow is obtained by excitation by the plasma power supply, a mixed plasma flow is formed by inputting a reactive gas source, and then the ferrocene powder is thermally evaporated, and the ferrocene vapor is sent into the plasma in the form of carrier gas Body center area

[0037] (3) Using the high plasma enthalpy and chemical activation effect, ferrocene is rapidly pyrolyzed and chemically reacted, and nano-magnetic particles are obtained through nucleation and growth at the tail of the plasma flame, and the surface of the particles is coated with graphene;

[0038] (4) The reaction chamber ...

Embodiment 1

[0043] Using commercially available ferrocene powder as the raw material, after cleaning the reaction chamber with argon several times, argon is used as the plasma forming gas to establish a stable operating argon plasma. The argon flow rate is 5 slpm and the side shielding argon flow rate is 5slpm. The temperature of the constant-temperature fluidized bed is set to 120°C, and the ferrocene vapor is sent into the plasma flame through argon with a flow rate of 3 slpm. After the plasma high temperature decomposition and activation reaction, the graphene-coated variable phase nano magnetic particles are obtained. The XRD graph is as figure 1 As shown, the TEM image and particle size distribution are as figure 2 Shown.

[0044] by figure 1 It can be seen that the phase composition of Example 1 is α-Fe, γ-Fe and C. by figure 2 It can be seen that the particle size distribution of the obtained graphene-coated variable-phase nanomagnetic composite material is between 10 and 90 nm, an...

Embodiment 2

[0046] Using commercially available ferrocene powder as raw material, after cleaning the reaction chamber with argon for many times, argon and nitrogen are used as plasma forming gases to establish a stable operation of argon-nitrogen plasma. The flow of argon is 5slpm and the flow of nitrogen is 1slpm, the side shielding gas argon flow rate is 10slpm. The constant temperature fluidized bed was set to 160°C, and the carrier gas flow rate was 1 slpm of argon. The other operations were the same as in Example 1. The XRD pattern of graphene-coated iron nitride nano magnetic particles is obtained as figure 1 As shown, the TEM image is image 3 Shown.

[0047] by figure 1 It can be seen that the phase composition of the product prepared in Example 2 is γ-Fe(N), γ’-Fe 4 N, ε-Fe 3 N. by image 3 It can be seen that the obtained graphene-coated variable-phase nanomagnetic composite material has a particle size distribution between 10 nm and 90 nm, and has an obvious core-shell structure,...

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Abstract

The invention provides a graphene-coated variable phase nano magnetic composite material with a core-shell structure. The shell is a graphene shell which is formed by multiple layers of graphene sheets, and the thickness of the shell layer is 5-50nm; and the core is a magnetic core and is a phase-variable nano magnetic particle with a particle diameter of 10-90nm. The invention also provides a preparation method of the graphene-coated variable phase nano magnetic composite material. According to the method provided by the invention, the ferrocene powder is taken as an iron source and a carbon source, and the plasma is taken as a synthetic environment so as to ensure that the toxicity and environmental pollution caused by reactants can be reduced and the mass production can be facilitated; the phase of the obtained magnetic nano particles can be controlled by controlling the nitrogen ratio of the plasma in the preparation process; and the graphene-coated nano magnetic powder prepared by adopting the method provided by the invention is fine in particle size, uniform in distribution, good in degree of sphericity and short in preparation process.

Description

Technical field [0001] The invention belongs to the technical field of nano functional powder materials and powder preparation, and specifically relates to a functional material of composite graphene and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional carbon material with a hexagonal honeycomb lattice composed of carbon atoms and sp2 hybrid orbitals. It is only one carbon atom thick. Graphene has strong toughness, electrical conductivity and thermal conductivity. Iron and iron-nitrogen compounds have excellent magnetic properties, but their chemical stability is poor, especially the iron phase. Using graphene as a coating material can well improve the chemical stability and poor conductivity of magnetic particles, so that this composite material can be well used in magnetic fluids, targeted drugs, electromagnetic wave absorption materials, electromagnetic shielding materials, and oxidation Various fields such as reduction catalysts, fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F1/11H01F1/36H01F41/00
CPCH01F1/0054H01F1/112H01F1/36H01F41/00
Inventor 王群冯唐锋王澈李永卿王明连
Owner BEIJING UNIV OF TECH
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