Improving of the tribological properties of attapulgite base grease with graphene

Abstract

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.

Tribology and Rheology of Polypropylene Grease with MoS2 and ZDDP Additives at Low Temperatures

“…With the complexity of modern mechanical systems and the severe demands of application conditions, additives have become important factors in endowing and improving the lubrication performance of greases under harsh working conditions [10][11][12][13]. ZDDP is a typical multifunctional lubricating additive, which can play the triple role of antioxidation, antiwear and corrosion inhibition [14].…”

Impact of Graphene Nano-Additives to Lithium Grease on the Dynamic and Tribological Behavior of Rolling Bearings

“…Furthermore, a reduction in the friction coefficient by up to 60% was obtained after adding 1 wt.% graphene to a semi-solid lubricant [33]. Nan et al [34] investigated the effect of mixing different graphene percentages with attapulgite-based grease. They observed that graphene additions improve the tribological behavior of the base grease, especially at high loading conditions.…”

Excellent effect of lubrication performance of chitosan/polyethylene glycol/palygorskite as water‐based lubricating additive on 304 stainless steel and polymer pairs

“…Pal as a kind of non‐metallic additive, can enhance the lubrication. [ 18,36,39,40 ] In recent years, researches showed that adding other lubricating additives on the basis of Pal can further improve the lubrication effect. [ 41 ]…”

“…Pal as a kind of nonmetallic additive, can enhance the lubrication. [18,36,39,40] In recent years, researches showed that adding other lubricating additives on the basis of Pal can further improve the lubrication effect. [41] In this study, different concentrations of PEG and CS were dispersed into deionized water to optimize the best lubrication effect.…”