New Ways of Obtaining Nanocomposites Based on Multi-Wall Carbon Nanotubes and Aluminum Alloy by High Pressure Casting

This study is performed to find ways for expanding use in industry of nanocomposites based on a light metal matrix and multiwall carbon nanotubes. Industrial tests are conducted using a high-pressure die casting process. Specimens are prepared in two ways using aluminum alloy AlSi9Cu3(Fe) with maximum specific magnesium content of 0.55 wt.%: by adding 0.2 wt.% of nanotubes directly to molten AlSi9Cu3(Fe) for the high-pressure die casting process, and by adding 0.05, 0.1 and 0.2 wt.% of nanotubes to the press ahead of the high-pressure die casting process piston. Chemical composition is determined and the effect of magnesium on improved interphase bonding leading to homogeneous distribution of multiwall carbon nanotubes is confirmed. Addition of 0.05 wt.% nanotubes results in a finer specimen microstructure, resulting in improved mechanical properties. Based on research, recommendations are proposed for the industrial scaling up and use of nanocomposites, particularly in automobile components.