b aminikia - Materials and Energy Research Center, Karaj, Iran
s.a tayebifard - Materials and Energy Research Center, Karaj, Iran
a.a youzbashi - Materials and Energy Research Center, Karaj, Iran

In current research, nanostructure of titanium diboride/titanium carbide was fabricated by combustion synthesis of mechanically milled reactant powders. The stoichiometric mixture of Ti and B4C as starting materials milled for 1, 3, 6 and 9 h. Milled powders pressed to form pellets.Green compactswere placed in a tube furnace preheated to 1100 oC in inert atmosphere (Ar).The samples were investigated by XRD and SEM analysis after different milling times and synthesis process. TiC and TiB2 were not formed during milling process. Analysis of the synthesized samples showed TiC was thefirst formed phase followed by TiB2, while other phases were not detected in the samples that were premilled for 6 and 9 h. Increasing of milling time helped significantly to improve distribution of TiB2 in the products. The crystallite size of TiB2 and TiC in the composite based on powder milled for 9 h was calculated to be 46.2 nm and 34.6 nm respectively.

TiC,TiB2,Nanocomposites,SHS,B4C,TE,Mechanically activated,