Fabrication of titanium carbide nano-powders by a very high speed planetary ball milling with a help of process control agents

Abstract

Nano-sized TiC ceramic powders were fabricated by very high speed planetary ball milling, especially using coarse (micron-sized) starting powders with the help of process control agents, and their refinement behavior was investigated as a function of the milling time and ball size. Fine and uniform TiC nano-particles were achieved through a short-time mechanical milling for 60min, in which small-sized milling balls were fairly advantageous to homogeneous particle refinement by inducing low-energy, but high-frequency collisions. Moreover, a liquid-type process control agent such as toluene played a crucial role in refining the TiC nano-particles, owing to its superior capability for heat dissipation during the milling process. Under the estimated optimal milling conditions, it is notable that the particle size of the TiC powders was effectively reduced well below 50nm, which was reliably characterized by direct transmission electron microscopy along with a complementary acoustic particle size analysis.