Plasma-spray synthesis and characterization of ti-based nitride and oxide nanogranules

Abstract

The synthesis of nanosized Ti-based nanogranules via plasma spraying is reported. The synthesis route involved use of both nitrogen and oxygen gases with varying results. On the case of nitrogen, a mixture of titanium nitrides were produced, yielding both the Ti 2 N and the sub-stoichiometric TiN 0.61 compounds. On the case of oxygen, both the stoichiometric rutile and TiD ceramic phases were indexed. Based on EDS analysis, even fractional oxygen concentrations caused tungsten impurities which originated from the cathode electrode. The method yielded particle mass median sizes of the order of 15nm and the smallest particles detected were 5nm.

Preparation of Metal Nitride Particles Using Arc Discharge in Liquid Nitrogen

“…Various plasma methods are currently being investigated for the synthesis of nitride particles. Thermal plasma processing [ 9 , 10 , 11 , 12 ] and plasma spray [ 13 ] have been reported for the preparation of Ti and Al nitrides. However, products contain oxide species due to imperfect nitridation and still use corrosive ammonia gas as a nitrogen source.…”