Fluidized-bed reduction-nitridation of monoclinic titania whiskers

Abstract

The fluidized-bed reduction-nitridation of monoclinic titania whiskers (diameter: 0.1∼0.5μm, length: 5∼10μm) was carried out at 900 ∼ 1450 °C for 30 min in N₂-NH₃-C₆H₁₄ gas mixture. Raw whiskers were fed on SiC filter placed at the center of the reactor. TiN was synthesized above 900 °C in N₂-NH₃ gas mixture. Conversion to TiN increased with increasing reaction temperature. The initial shape of whiskers were maintained at 900 to 1300 °C, however, it was found that needle-like fibers were synthesized at 1450 °C. Compacted whiskers after reduction-nitriding showed the highest electrical conductivity of 0.19 Ω cm.