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Layered palygorskite (PAL), commonly called attapulgite, is a natural inorganic clay mineral composed of magnesium silicate. In this study, an aqueous miscible organic solvent treatment method is adopted to prepare molybdenum-dotted palygorskite (Amo-PMo) nanoplatelets, which greatly improved the specific surface area of PAL and the dispersion effect in an oil-based lubricant system. Their layered structure and size were confirmed using transmission electron microscopy (TEM) and atomic force microscopy. Following a tribological test lubricated with three additives (PAL, organic molybdenum (SN-Mo), and Amo-PMo), it was found that the sample of 0.5 wt% Amo-PMo exhibited the best tribological properties with a coefficient of friction of 0.09. Moreover, the resulting wear scar diameter and wear volume of the sliding ball surface were 63% and 49.6% of those lubricated with base oil, respectively. Its excellent lubricating performance and self-repairing ability were mainly attributed to the generated MoS2 adsorbed on the contact surfaces during the tribochemical reaction, thereby effectively preventing the direct collision between asperities on sliding solid surfaces. Thus, as-prepared Amo-PMo nanoplatelets show great potential as oil-based lubricant additives, and this study enriches the existing application of PAL in industry.


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Tribological properties of novel palygorskite nanoplatelets used as oil-based lubricant additives

Show Author's information Kunpeng WANG1,2Huaichao WU1( )Hongdong WANG2Yuhong LIU2( )Lv YANG1Limei ZHAO1
School of Mechanical Engineering, Guizhou University, Guiyang 550025, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Abstract

Layered palygorskite (PAL), commonly called attapulgite, is a natural inorganic clay mineral composed of magnesium silicate. In this study, an aqueous miscible organic solvent treatment method is adopted to prepare molybdenum-dotted palygorskite (Amo-PMo) nanoplatelets, which greatly improved the specific surface area of PAL and the dispersion effect in an oil-based lubricant system. Their layered structure and size were confirmed using transmission electron microscopy (TEM) and atomic force microscopy. Following a tribological test lubricated with three additives (PAL, organic molybdenum (SN-Mo), and Amo-PMo), it was found that the sample of 0.5 wt% Amo-PMo exhibited the best tribological properties with a coefficient of friction of 0.09. Moreover, the resulting wear scar diameter and wear volume of the sliding ball surface were 63% and 49.6% of those lubricated with base oil, respectively. Its excellent lubricating performance and self-repairing ability were mainly attributed to the generated MoS2 adsorbed on the contact surfaces during the tribochemical reaction, thereby effectively preventing the direct collision between asperities on sliding solid surfaces. Thus, as-prepared Amo-PMo nanoplatelets show great potential as oil-based lubricant additives, and this study enriches the existing application of PAL in industry.

Keywords: wear, lubricant additive, tribofilm, palygorskite (PAL), layered material

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Publication history

Received: 19 July 2019
Revised: 24 October 2019
Accepted: 03 December 2019
Published: 12 May 2020
Issue date: April 2021

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© The author(s) 2019

Acknowledgements

This project was supported by Major Science and Technology Project in Guizhou Province (Grant No. Q.K.H.Z.D.Z.X.Z[2019]3016), National Natural Science Foundation of China (Grant Nos. 51527901, 51875303, 51905294, and 51465008), Science and Technology Innovation Team Project in Guizhou Province (Grant No. Q.K.H.P.T.R.C[2020]5020), Preferred Project of Scientific and Technological Activities for Personnel Studying Abroad in Guizhou Province (Grant No. Q.R.X.M.Z.Z.H. T(2018)0001), Science and Technology Planning Project in Guizhou Province (Grant No. Q.K.H.P.T.R. C[2017]5788), and Training Plan for High-level Innovative Talent in Guizhou Province (Grant No. Q.K.H.P.T.R.C[2016]5659).

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