Nanometer Titanium Research Articles

Preparation of nanometer titanium oxide with n-butanol supercritical drying

n-Butanol supercritical drying technique was developed to prepare nanometer particles. The procedure mainly consisted of sol preparation, filtering as well as washing, replacement of water in the precipitate with n-butanol and supercritical drying. Anatase and rutile mixture with a particle size of 10–20 nm, a surface area of 166.8 m 2/g and a pore volume of 1.286 ml/g was obtained using the preparation technique. No marked coagulation was caused by the effect of water– n-butanol interface tension in the thermal treatment to replace water in the precipitate with n-butanol. Ethanol supercritical drying also gave anatase titanium oxide. The thermal treatment during the preparation of both ethanol and n-butanol supercritical drying resulted in evident growth of crystal.

Study on antiwear and reducing friction additive of nanometer titanium oxide

Nanometer crystal titanium oxide with a particle size of about 20 nm was prepared using ethanol supercritical fluid drying technique. Tribology properties of 500 SN oil with the nanometer particles were measured using four-ball and block-on-ring tribotester. Results indicated that wear resistance and load carrying capacity of 500 SN base oil were improved and friction coefficient was decreased by an addition of the nanometer particles. There was an optimal content of titanium oxide in the oil, which gave the highest maximum nonseized load. Nanometer titanium oxide took effect by its deposition on rubbing surface.

Study on antiwear and reducing friction additive of nanometer titanium borate

Crystal titanium borate with a particle size of 10–70 nm was prepared using Ethanol Supercritical Fluid Drying technique. Tribology properties of 500 SN base oil containing so-prepared nanometer titanium borate were evaluated. Results indicate that wear resistance and load carrying capacity of the oil were improved and the friction coefficient of the oil was decreased. The improvement of tribological properties of the oil under low load resulted from the deposition of the nanometer titanium borate. The deposition and tribochemical reaction produced some diboron trioxide on the wear scar.