With the rapid development of industry, individuals paid increasing demanding on the friction-reducing and antiwear properties of lubricants under harsh service conditions. Here, the attapulgite base grease and attapulgite greases with grephene were successfully synthesised. The tribological behaviours of the greases were comparatively investigated using a SRV-IV tribometer with the ball-on-disk configuration. The results show that the attapulgite grease with graphene presents better friction-reducing and antiwear properties than the attapulgite base grease, especially at high load, frequency and temperature. The friction-reducing and antiwear mechanism was determined through the analysis of worn surfaces and tribofilms formed on it. The results revealed that a tribofilm composed with Fe, Fe₃C, Fe₂O₃, FeOOH, Al₂O₃, SiO₂, graphene, attapulgite and organic compounds was formed on the worn surface, which is responsible for the excellent tribological properties of the attapulgite grease with graphene. Thus, as-prepared attapulgite grease with graphene shows great potential in the lubrication for mechanical equipment operated under harsh conditions.

中文翻译：

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用石墨烯改善凹凸棒基润滑脂的摩擦学性能

随着工业的快速发展，人们对润滑油在恶劣的使用条件下的减摩抗磨性能的要求越来越高。在此，成功合成了凹凸棒基润滑脂和含石墨烯的凹凸棒基润滑脂。使用具有球盘结构的 SRV-IV 摩擦计对润滑脂的摩擦学行为进行了比较研究。结果表明，含石墨烯的凹凸棒石润滑脂比凹凸棒基润滑脂具有更好的减摩和抗磨性能，尤其是在高负荷、高频率和高温度下。通过对磨损表面及其上形成的摩擦膜的分析，确定了减摩和抗磨机理。结果表明，由 Fe、Fe ₃ C、Fe组成的摩擦膜₂ O ₃、FeOOH、Al ₂ O ₃、SiO ₂、石墨烯、凹凸棒石和有机化合物在磨损表面形成，这是具有石墨烯的凹凸棒石润滑脂优异摩擦学性能的原因。因此，制备的含石墨烯的凹凸棒石润滑脂在恶劣条件下运行的机械设备的润滑中显示出巨大的潜力。