Tribological properties of nanometer cerium oxide as additives in lithium grease
来源期刊：Journal of Rare Earths2018年第2期
论文作者：Qiang He Anling Li Yachen Guo Songfeng Liu Yong Zhang Linghao Kong
文章页码：209 - 214
摘 要：This paper presents a comparative study of the influence of nanometer-CeO2（nano-CeO2） and temperature on tribological and lubricating properties of lithium grease. The morphology and structure of nanocrystals were characterized by means of transmission electron microscopy（TEM） and X-ray diffraction（XRD）, respectively. Friction and wear tests were conducted on the friction and wear tester.Results show that the lithium grease with addition of nanometer-CeO2 has much better friction-reducing and anti-wear performance than that of base grease. When the additive in grease is 0.6 wt%, the friction coefficient（COF） and wear scar diameter（WSD） decrease by 28% and 13% comparing with base grease,respectively. The base grease and grease with 0.6 wt% nanometer-CeO2 both possess the lowest average COF and wear width at 50 ℃. The worn surface morphology after friction test was analyzed by scanning electron microscopy（SEM） and NANOVEA three-dimensional profilometer. Under the lubrication of the lithium grease containing 0.6 wt% nano-CeO2. few shallow furrows can be observed on the quite smoothed surface and the WSD decreased. Moreover, It was found that the nano-CeO2 has been incorporated into the surface protective and lubricious layer by energy dispersive spectrometer（EDS） analysis.
Qiang He，Anling Li，Yachen Guo，Songfeng Liu，Yong Zhang，Linghao Kong
Department of Mechanical Engineering, Anyang Institute of Technology
摘 要：This paper presents a comparative study of the influence of nanometer-CeO2（nano-CeO2） and temperature on tribological and lubricating properties of lithium grease. The morphology and structure of nanocrystals were characterized by means of transmission electron microscopy（TEM） and X-ray diffraction（XRD）, respectively. Friction and wear tests were conducted on the friction and wear tester.Results show that the lithium grease with addition of nanometer-CeO2 has much better friction-reducing and anti-wear performance than that of base grease. When the additive in grease is 0.6 wt%, the friction coefficient（COF） and wear scar diameter（WSD） decrease by 28% and 13% comparing with base grease,respectively. The base grease and grease with 0.6 wt% nanometer-CeO2 both possess the lowest average COF and wear width at 50 ℃. The worn surface morphology after friction test was analyzed by scanning electron microscopy（SEM） and NANOVEA three-dimensional profilometer. Under the lubrication of the lithium grease containing 0.6 wt% nano-CeO2. few shallow furrows can be observed on the quite smoothed surface and the WSD decreased. Moreover, It was found that the nano-CeO2 has been incorporated into the surface protective and lubricious layer by energy dispersive spectrometer（EDS） analysis.
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