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
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[0021] The preparation method of iron nitride and expanded graphite composite material includes the following 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 in expanded graphite:
[0025] Add expanded graphite to the stoichiometric ratio of ferric acetate in ethanol, stir, evaporate the solvent in a water bath, dry at 423 K, and then in the flowing H 2 Under conditions, pre-reduction at 723 K in a tube furnace, cooling to room temperature and removing the liquid water generated by the reduction, and then adding desiccant at both ends of the tube furnace, and introducing flowing N 2 4 h;
[0026] (3) Ammonia nitriding:
[0027] In the tube furnace, the initial sample prepared in step (2) is used with flowing H 2 Reducing at 723 K for 3 h, and then passing NH at 300~600℃ 3 With H 2 The mixed gas was nitridated f...
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