Abstract
Floating-type reduction-nitridation of flake-like TiO2 powder in N2-NH3 and N2-NH3-C6H14 was investigated at 800 to 1550 °C.Flake-like titanium nitride powder containing unreacted TiO2 (rutile-type) and titanium oxynitride was synthesized at above 1200 °C. The color of resultant powders, which were nitrided in N2-NH3-C6H14 gas mixture at above 1300 °C, was brown. The specific surface areas and particle size distribution of resultant powders were almost same as the raw TiO2 powder for all reaction temperature. Following floating-type reduction-nitridation of flake-like TiO2 powder, packed-bed nitridation was carried out at 1000 to 1550 °C. The electrical resistivity of compacted resultant powder decreased with increasing reaction temperature, and had smallest value of 0.008Ω•cm by packed-bed nitrided at 1550 °C.
