Preparation of carbon-silicon carbide composite powder via a mechanochemical route

摘要

A carbon-silicon carbide (C_p-SiC) composite powder was prepared with nano-carbon (C_p) and silicon (Si) powders as starting materials via a mechanochemical treatment in Ar atmosphere in a stirred ball mill. The composite powder was characterized by X-ray diffraction (XRD), thermogravimetry/differential scanning calorimetry (TG/DSC), scanning electron microscopy (SEM) and transmission electron microscopy/high resolution transmission microscopy (TEM/HRTEM). Effects of parameters (such as grinding time, ratio of ball to powder, grinding mode and atmosphere) on the synthesis of β-SiC particles, and the simultaneous preparation of C_p-SiC composite powder with the synthesized particles of P-SiC and the remaining C_p by mechanochemical treatment were investigated. The results show that P-SiC particles can be synthesized and the C_p-SiC composite powder in the presence of excessive nano-sized carbon can be simultaneously obtained via the mechanochemical route.