Exploring Lubrication Function of MACs Greases for TC4 Alloy Under Sliding and Fretting Conditions

Lubrication function of multialkylated cyclopentanes (MACs) greases for the contact TC4/Steel was investigated in detail under the sliding and fretting conditions, and the worn tracks were measured by surface/interface analysis techniques to explore the friction mechanisms. The results demonstrate that these lubricating greases have good friction-reducing function under fretting and sliding conditions, and their friction reduction is superior to wear resistance, especially calcium sulfonate complex grease. Good lubrication function of MACs greases under sliding friction mainly depends on synergies of grease-film and friction-induced chemical reaction film. Fretting behaviors depend on not only grease-film and chemical reaction film, but also fretting wear mechanisms including abrasion, oxidation, and delamination.