SiC-graphene nano-composite and preparation method thereof

A nano-composite material and graphene technology, applied in the field of SiC-graphene nano-composite materials and its preparation, can solve problems such as complex processes, achieve the effects of simple process steps, low production costs, and stable physical and chemical structures and properties

CN102600775BInactive Publication Date: 2014-05-21NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-05-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a SiC-graphene nano-composite and a preparation method thereof. The SiC-graphene nano-composite has a core-shell structure with the core covered with the shell, wherein the core is made of SiC nano particles, and the shell is made of nano graphite composed of the graphene. The preparation method includes steps of (1) precursor pyrolysis: heating and pyrolyzing the polymer pyrolysis into SiC nano particles at the inert gas atmosphere in a chemical gas-phase deposition furnace; (2), chemical gas-phase deposition: heating continuously until silicon atoms on surfaces of the SiC nano particles are sublimed and escape, forming graphite fragments by means of recombination of the residual carbon atoms, and finally obtaining the SiC-graphene nano-composite by deposition and growth of the graphite fragments. The SiC-graphene nano-composite has the advantages of excellent physical and chemical properties and mechanical properties, simplicity in preparation process, low cost and wide application range.
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Description

technical field

[0001] The invention relates to the field of nanocomposite materials, in particular to a SiC-graphene nanocomposite material and a preparation method thereof. Background technique

[0002] Graphene is a revolutionary new carbon material formed by densely stacking a single layer of carbon atoms. Its thickness is only 0.335 nanometers. It is currently the thinnest two-dimensional material in the world. Structural units. Graphene has a lattice structure arranged in a two-dimensional honeycomb form. The basic structural unit is a stable carbon six-membered ring. The atoms are combined with strong carbon-carbon bonds, so the graphene structure is very stable. The stable lattice structure of graphene makes it have excellent electrical conductivity. Electrons in graphene move through their orbits without being scattered by lattice defects or the introduction of foreign atoms. Due to the very strong interatomic force, at room temperature, even if the surrounding c...

Examples

Embodiment 1

[0027] A SiC-graphene nanocomposite material of the present invention is a core-shell structure in which an outer shell covers a core, the inner core is SiC nanoparticles, and the outer shell is nano-graphite composed of graphene. SiC-graphene nanocomposites are generally spherical particles with a diameter of 100 nm to 300 nm and a feather-like surface. Graphene in nano-graphite has 8-15 layers and grows along the radial direction of SiC nanoparticles.

[0028] The above-mentioned SiC-graphene nanocomposite material is prepared through the following steps:

[0029] (1) Preparation:

[0030] a. Prepare the process unit: if figure 1 As shown, prepare a tubular chemical vapor deposition furnace 1 with an air inlet 11 and an air outlet 12 at both ends, place a graphite boat 3 in the tubular chemical vapor deposition furnace 1, and place graphite boats 3 sequentially along the airflow direction An alumina crucible 2 for accommodating raw materials and a graphite substrate 4 for...

Embodiment 2

[0040] A SiC-graphene nanocomposite material of the present invention is a core-shell structure in which an outer shell covers a core, the inner core is SiC nanoparticles, and the outer shell is nano-graphite composed of graphene. SiC-graphene nanocomposites are generally spherical particles with a diameter of 100 nm to 200 nm and a feather-like surface. Graphene in nano-graphite has 8-15 layers and grows along the radial direction of SiC nanoparticles.

[0041] The SiC-graphene nanocomposite material of the present embodiment is prepared through the following steps:

[0042] (1) Preparation: Same as Example 1.

[0043] (2) Precursor cracking:

[0044] c. Introduce high-purity nitrogen gas into the tubular chemical vapor deposition furnace 1, and repeat 2 to 3 times to exhaust the air in the furnace.

[0045] d. Heat the tubular chemical vapor deposition furnace 1 to 800°C at a temperature increase rate of 8°C / s, keep the nitrogen flow at 30 sccm to 50 sccm during the heati...