A graphene/sic composite particle reinforced metal matrix composite
A technology of composite particles and composite materials, applied in metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of insufficient fracture toughness, large surface energy, constraints, etc., to improve interface bonding, increase strength and Resilient, easy-to-control effects
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Embodiment 1
[0041] Graphene-coated SiC composite particles were prepared by pyrolyzing SiC in a vacuum environment. The schematic diagram is shown in figure 1 . The quality and thickness of graphene on the SiC surface can be controlled by controlling the temperature, vacuum degree and holding time. The electron micrographs of the graphene-coated SiC composite particles prepared by this method are shown in image 3 .
[0042]Mix the graphene-coated silicon carbide composite powder and metal powder evenly. During the mixing process, a high-energy ball mill can be used to wet-mix the graphene-coated SiC composite powder and aluminum powder in alcohol. The mixing speed is 500r / min. for 6h. After the powder mixing, place it in a vacuum drying oven and dry it at a temperature of 50 degrees, and then the mixed powder of graphene / SiC and aluminum is obtained. Figure 5 shows the graphene-coated SiC composite powder and aluminum powder Electron micrographs after mixing by high energy ball milli...
Embodiment 2
[0045] Graphene was deposited on the SiC surface by chemical vapor deposition. Put an appropriate amount of SiC powder into a chemical vapor deposition furnace, vacuumize it, and heat it up to a certain temperature (400~1200°C) under the protection of hydrogen or other inert gases; use hydrocarbons such as methane, ethylene or acetylene as carbon sources , with an appropriate amount of hydrogen, inert gas (nitrogen, argon) as the carrier gas, at an appropriate temperature (400~1200 ° C) or with plasma assistance for a certain period of time, graphene deposition and growth. After the growth is over, the temperature is lowered under the protection of hydrogen (or argon, nitrogen). Electron microscope photos of graphene-coated SiC composite particles prepared by chemical vapor deposition are shown in Figure 4 .
[0046] The graphene-coated silicon carbide composite powder is uniformly mixed with the metal powder, and then the uniformly mixed powder is put into a mold, and a gr...
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