Low temperature synthesis from concentrated solution and sintering of rutile fine powder

Abstract

The most optimum conditions of hydrolysis for preparation of raw powder of titania was studied. The Ti(OH)4 precipitated from TiCl4-HCl solution by adding NH4OH, then filtered and washed, adjusted the amount of water contained in Ti(OH)4 cake by a centrifuge. Slurries were added conc. HCl to adjust Cl-/Ti4+ ratio. The slurry was heated at 40C for 24 hours. At Cl-/Ti4+ ratio=1 synthesis ratio was 98%, specific surface area was 83 m2/g, and the relative density of >98% was attained by firing at 950C for 3 hours.