Rapid synthesis of Ti(C, N) powders by mechanical alloying and
subsequent arc discharging
subsequent arc discharging
(1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
2. College of Mechanical and Materials Engineering, China Three Gorges University, Yichang 443002, China)
Nanjing 210016, China;
2. College of Mechanical and Materials Engineering, China Three Gorges University, Yichang 443002, China)
Abstract: Ti(C,N) powders were synthesized by mechanical alloying (MA) from a mixture of pure titanium and graphite under a nitrogen atmosphere in a planetary mill. Effects of arc discharging on phase transformation and microstructure of MA powders milled for 1−7 h were explored. The results show that Ti(C,N) powders were prepared after mechanical milling for 1 h and subsequent arc discharge treatment, whereas the synthesis reaction did not occur in 7 h by mechanical milling alone. The ions produced during arc discharging interacted with powder particles and accelerated the diffusion of atoms and the nucleation on the surface of the as-milled powder, which results in fast synthesis of Ti(C,N) powders. The formation mechanisms of the two synthesis processes are self-propagating reactive synthesis.
Key words: Ti(C,N) powders; mechanical alloying; self-propagating reactive synthesis