Modified Ni Nanoparticles as Additives in Various Greases: Assessment of Comparative Performance Potential

China’s rapid industrial development requires more energy consumption based on non-renewable resources. The caused by unnecessary friction accounts for about 4.5% of the GDP in China. Although grease effectively lubricates machines, lubrication failure may occur under severe conditions. Nanomaterials exhibit intriguing tribological performances and have received much attention regarding lubrication. In this study, oleylamine-modified Ni nanoparticles (OA-Ni) were synthesized used as lubricant additive four kinds commonly greases: lithium, calcium, composite polyurea grease. OA-Ni uniformly dispersed greases through electromagnetic stirring, ultrasonic vibration, three-roll grinding. physicochemical properties structure OA-Ni-doped investigated, while feasibility various additives at different contact modes was evaluated a four-ball tester UMT-tribolab tester. Tribological tests results revealed that friction-reducing anti-wear point-to-point increased 56.7% 70.3% lithium grease, respectively, those point-to-face 59.5% 68.9% respectively. present work provides not only theoretical guidance nano nickel modification but also practical reference application modified nanomaterials to greases.