Synthesis of novel metal matrix composites Al–Al2O3–graphene

L. A. Elshina, R. V. Muradymov, A. G. Kvashnichev, D. I. Vichuzhanin, N. G. Molchanov, A. A. Pankratov 

ABSTRACT:

Molten aluminum matrix was studied depending on the morphology and type of particle precursor, temperature and gas atmosphere, and the influence of the composition of an aluminum composite (depending on the concentration and reinforcing particle size) in its mechanical and corrosion properties as well as heat conductivity and melting point. It was shown that at the chemical interaction of the molten salt containing yttrium oxide and boron carbide with molten aluminum in air hybrid metal composite material Al–A2O3–graphene synthesized with uniform distribution throughout the metal volume and was completely wetted by the aluminum microparticle aluminum oxide in concentrations up to 10 and 0.2 wt % of graphene films. Simultaneous introduction of alumina and graphene in the aluminum matrix produces the hybrid  metal composite materials with a unique combination of properties: thermal conductivity 40% higher than aluminum one, 2-fold improved hardness and strength, and increased by 3 times the tensile elongation and improved corrosion resistance of 2.5–4-fold compared to the initial aluminum. The world’s first synthesized by “in situ”hybrid composite material Al–Al2O3–graphene has a unique combination of a number of characteristics which allows recommending it as a promising material for a wide range of electrotechnical applications, particularly, ultrafine wire, and a structural material for air-craft and shipbuilding industries.

KEYWORDS: 

aluminum, alumina, graphene, metal-matrix composite, molten salts, mechanical properties, heat conductivity