2011 Volume 51 Issue 10 Pages 1576-1579
Nano-sized ZrC was prepared by combustion synthesis (CS) from Cu–Zr–C elemental powder mixtures. The ZrC particle size greatly decreased from about 10 μm with an irregular shape in free Cu addition to nano-meter order with a nearly spherical shape in Cu addition ranging from 10 wt.% to 30 wt.%. The formation mechanism of the nano-sized ZrC was discussed. The low dissolubility of C into Cu melt may greatly inhibit the growth of product ZrC, resulting in formation of ZrC particles as fine as nano-sized C. Melting of metallic Cu plays an important role in the formation mechanism of the nano-sized ZrC.