Mechanical Properties of CNTS-Grafted Carbon Fiber/Magnesium Composites Prepared by Liquid-Solid Infiltration Extrusion

Abstract

CNTs-grafted carbon fiber reinforced magnesium composites (CNTs-Cf/Mg) were successfully prepared by liquid-solid infiltration extrusion process, in which the carbon fiber cross-ply preform were grafted with carbon nanotubes (CNTs) by using the injection chemical vapor deposition (ICVD) technique. The mechanical properties of AZ91D matrix alloy and magnesium matrix composite at different states were tested and compared. The results show that the dendrites of the as-cast AZ91D alloy are transformed into granular grains after liquid-solid forming. The composite reinforced by carbon fiber with grafting nanotubes is beneficial to the one reinforced with carbon fiber but without grated CNTs. The nanotubes grafted on carbon fiber improve the bonding property of the fiber-matrix interface and protect the carbon fiber from degradation more effectively. The tensile strength of the CNTS-Cf/Mg composites is 28.3% higher than the Cf/Mg composites.