Investigate on the tribological properties of additives in tetra polyurea grease

Abstract

In this paper, the effects of five different additives on the tribological properties of tetra polyurea greases prepared under the same conditions were studied. The friction coefficient, friction force, wear scar diameter, PB and PD of the tetra urea greases prepared under the conditions of the five additives were examined by a four-ball friction tester. The steel mesh oil separation of the tetra polyurea grease prepared with different additives under the same conditions was tested and compared with the tetra polyurea grease prepared without additives. The results showed that the type and amount of additives basically had no effect on the steel mesh oil separation of the tetra plolyurea grease. The steel mesh oil separation content was maintained at 0.6% around. The tetra polyurea grease prepared with the additive of fluorinated graphite has excellent lubricating properties and abrasion resistance compared to several other additives. In addition, the tribological properties of tetra polyurea grease prepared with the constant change of fluorinated graphite content are also constantly changing. The wear scar diameter at the content of 2% is 0.3146mm. At this time, the friction coefficient and friction force value are the minimum.