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Graphene/SiC composite particle enhanced metal-base composite material

A technology of composite particles and composite materials, applied in metal material coating technology, gaseous chemical plating, coating, etc., can solve problems such as insufficient fracture toughness, large surface energy, and hindering performance, and achieve improved interface bonding and increased dispersion Uniformity, the effect of improving strength and toughness

Active Publication Date: 2019-01-01
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiC particle reinforced aluminum matrix composite material (SiCp / Al) is the most typical SiC particle reinforced metal matrix composite material. Taking SiCp / Al composite material as a representative, the problems faced by SiC particle reinforced metal matrix composite materials are analyzed: (1) interface Various responses, difficult interface control
(2) Insufficient fracture toughness
Therefore, the complex interfacial reaction and insufficient fracture toughness faced by SiCp / Al composite materials hinder the further improvement of its performance and seriously restrict its wider application in aviation, aerospace and civil industries.
[0013] Graphene is an ideal nano-enhanced phase for composite materials, but because graphene is very light in weight and has a huge surface energy, it is very easy to agglomerate, so it is difficult to uniformly disperse graphene in the aluminum matrix

Method used

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  • Graphene/SiC composite particle enhanced metal-base composite material
  • Graphene/SiC composite particle enhanced metal-base composite material
  • Graphene/SiC composite particle enhanced metal-base composite material

Examples

Experimental program
Comparison scheme
Effect test

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 Shown is an electron micrograph of graphene-coated SiC composite powder mixed with aluminum powder by high-energy ball milling...

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, the 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 ...

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Abstract

The invention discloses a graphene in-situ-coated SiC(graphene / SiC) composite particle enhanced metal-base composite material. A preparation method comprises the following steps: S1, coating SiC particles with graphene, and thus obtaining composite particles; and S2, preparing the graphene-coated SiC particle enhanced metal-base composite material. The composite material enhanced by adopting the graphene / SiC particles has significant toughening effect; and the graphene / SiC composite particles can significantly improve the wear resistance, heat conductivity, electric conductivity and low heat expansion performance of the material.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a graphene in-situ coated SiC (graphene / SiC) composite particle reinforced metal matrix composite material. Background technique [0002] Silicon carbide particle-reinforced metal matrix composites have advantages such as low density, high specific strength and specific stiffness, high elastic modulus, good wear resistance, high thermal conductivity and low thermal expansion coefficient, and are currently the most mature and most advanced technology. One of the competitive metal matrix composite materials. In addition, SiC particles are inexpensive and widely available. [0003] Graphene has extremely high Young's modulus (1.0TPa) and fracture stress (130GPa), stronger than diamond, and its strength is about 100 times that of the best steel; it has the highest thermal conductivity and excellent electrical conductivity among known materials properties; has a huge specific surf...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00C22C1/10C23C16/26
CPCC22C1/05C22C21/00C23C16/26
Inventor 韩银龙陈玮常彦春韦国科
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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