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Preparation method of iron nitride and expanded graphite composite material

A technology of expanded graphite and composite materials, applied in chemical instruments and methods, nitrogen compounds, graphite, etc., can solve the problem of low shielding efficiency, achieve high magnetic permeability, good electromagnetic shielding efficiency, and improve the effect of electromagnetic shielding efficiency

Inactive Publication Date: 2017-05-31
SHAANXI JUJIEHAN CHEM CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] Expanded graphite is a good high-frequency electromagnetic shielding material, but because of its diamagnetic properties, the shielding effectiveness is not high at low frequencies

Method used

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Embodiment Construction

[0021] The preparation method of iron nitride and expanded graphite composite material comprises the steps:

[0022] (1) Preparation of expanded graphite:

[0023] The expanded graphite is heated by 2.4GHz microwave with a power density of 300 W / g, and the expansion rate is about 250 times;

[0024] (2) Fe particles implanted into expanded graphite:

[0025] Add expanded graphite to the ethanol solution of stoichiometric iron acetate, stir, evaporate the solvent in a water bath, dry at 423 K, and then dry in flowing H 2 Pre-reduced at 723 K in a tube furnace under the conditions, cooled to room temperature and removed the liquid water generated by the reduction, then added a desiccant at both ends of the tube furnace, and fed flowing N 2 4 hours;

[0026] (3) Ammonia nitriding:

[0027] In a tube furnace, the initial sample prepared in step (2) was heated with flowing H 2 Secondary reduction at 723 K for 3 h, followed by NH at 300-600 °C 3 with H 2 The mixed gas nitrid...

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Abstract

The invention relates to the technical field of function materials, and in particular relates to a preparation method of an iron nitride and expanded graphite composite material. The preparation method of the iron nitride and expanded graphite composite material comprises the following steps: heating the expanded graphite by use of 2.4 GHz microwave with power density of 300W / g, wherein the expansion rate is about 250 times; adding the expanded graphite in an ethanol solution of iron acetate in stoichiometric proportion, stirring, water bathing to evaporate the solvent, drying at 423K, pre-reducing at 723k in a tubular furnace under a flowing H2 condition, cooling to room temperature, and removing liquid-state water generated by reduction, adding a drying agent at two ends of the tubular furnace, introducing the flowing N for 24h; secondarily reducing the initial sample prepared in the step (2) at 723K by use of flowing H2 for 3 hours in the tubular furnace, introducing the NH3 to perform nitriding reaction with a gas mixture of the H2 for 5 hours at 300-600 DEG C, and cooling to room temperature. The finished product disclosed by the invention has high magnetic permeability.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a preparation method of iron nitride and expanded graphite composite material. Background technique [0002] Expanded graphite is a good high-frequency electromagnetic shielding material, but because of its diamagnetic properties, the shielding effectiveness is not high at low frequencies. If magnetic materials are implanted in expanded graphite, the composite material has excellent electromagnetic properties, which can significantly improve its shielding effect on low-frequency electromagnetic waves. The implanted magnetic particles that have been studied so far are mainly Fe / Co / Ni and iron oxides. . [0003] Iron nitride is an interstitial nitride with good magnetic properties, and has good application prospects in the fields of magnetic recording and electronic materials. According to reports, Fe 8 N has a singularly high saturation magnetic flux density, and F...

Claims

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Application Information

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IPC IPC(8): C01B32/22C01B21/06
CPCC01B21/0622C01P2004/80C01P2006/42
Inventor 李长英
Owner SHAANXI JUJIEHAN CHEM CO LTD
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