Impact of polydimethylsiloxanes on physicochemical and tribological properties of naphthenic mineral oil (KN 4010)-based titanium complex grease

Titanium complex greases were prepared by using naphthenic mineral oil and polydimethylsiloxane as the mixed base oil. The effect of polydimethylsiloxane molecular weight and polydimethylsiloxane content in mixed base oil on the physicochemical and tribological properties of titanium complex greases was investigated. As compared to the sole mineral oil-based titanium complex grease, the use of polydimethylsiloxane (H201-350) as a co-base oil increased the dropping point from 310 to 329 °C, decreased the oil separation from 3.7% to 2.3%, reduced the corrosion extent, and obviously improved the tribological properties. When the mixed oil-based titanium complex grease was used as a lubricant, lubricating films of polydimethylsiloxane were probably formed on the surfaces of friction pairs, giving good lubricating property. [Display omitted]