Effect of Slurry Characters of Titanium Nitride on Forming and Sintering Behaviors

Abstract

Titanium nitride (TiN) slurry was prepared for slip casting with water, and the effects of slurry characters on forming and sintering behaviors were studied. 46.4vol% TiN powder was dispersed in water with triethylamine (TEA) and polycalboxyl ammonium (PCA), and formed in a gypsum mold. Formed compacts were sintered at about 0.7MPa N₂ pressure, at 1750°C for 3h. The slurries with TEA content above 0.02mass% showed low viscosity and non-thixotropy. The slurries with PCA content in the range 0.06-0.08mass% showed the minimum viscosity and minimum thixotropy. High-density specimens (density of 3.8-3.9×10³kg·m^-3) could be sintered from the low viscosity slurry, prepared by the addition of TEA with pH higher than 10 and optimum addition of PCA.