Abstract
The tribological properties of α-zirconium phosphate particles as an additive in anhydrous calcium grease were studied by using an Optimol SRV-V oscillating reciprocating tester and a four-ball tester. Fortunately, α-Zr(HPO4)·H2O (α-ZrP) grease exhibits excellent properties in anti-friction and wear-resistant, load-carrying capacity, and extreme pressure properties. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and 3D analysis show that α-ZrP particles appear to form a protective film allowing increased load capacity and operating frequency of the rubbed pairs. Meanwhile, α-ZrP particles can provide low friction coefficient and wear loss during a long-term test.
Highlights
It is reported that a large amount of fuel energy is spent to conquer the mechanical losses because of friction, as in paper machines, passenger cars, trucks, and buses, from a comprehensive study by Holmberg et al [1,2,3]
Our recent study demonstrated that α-Zr(HPO4 )·H2 O (α-ZrP) had good performance in anti-wear, friction-reduction, and load-carrying capacity as a solid lubricating additive in lithium grease [11,12]
The mixture was heated to 120 ◦ C for 1.5 h, the temperature increased to 140 ◦ C for 10 min, the remaining PAO8 was added to the grease kettle, stirred until the temperature cooled to room temperature, and the base anhydrous calcium-based grease was obtained
Summary
It is reported that a large amount of fuel energy is spent to conquer the mechanical losses because of friction, as in paper machines, passenger cars, trucks, and buses, from a comprehensive study by Holmberg et al [1,2,3]. Our recent study demonstrated that α-Zr(HPO4 )·H2 O (α-ZrP) had good performance in anti-wear, friction-reduction, and load-carrying capacity as a solid lubricating additive in lithium grease [11,12]. Whether under rolling mode or reciprocating mode, α-ZrP has better tribological property than the conventional solid lubricant molybdenum disulfide. Α-ZrP particles can form a protective film to prevent the two friction pairs direct contact These properties make α-ZrP promising candidates for lubricant additives. The tribological properties of α-ZrP as an additive in anhydrous calcium grease were investigated by using an Optimol SRV-V tester and a four-ball tester. The tribological performance of α-ZrP, MoS2 , and graphite anhydrous calcium grease was evaluated at different applied loads, frequencies, temperatures, and durations. A 3D optical profiling system, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) were employed to study traces of the friction surface to obtain an adequate understanding of the lubrication mechanism
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