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The tribological behavior of 316L stainless steel/CoCrMo alloy contacts under aqueous lubrication was investigated in this work. Three types of microgels including poly(N-isopropylacrylamide) (PNIPAM), polyacrylic acid (PAA), and poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-PAA) were prepared and used as lubricant additives in aqueous solutions. Tribological tests were conducted using a ball-on-disk reciprocating tribometer, over a range of temperatures, pH, and concentrations of the microgels. The PNIPAM-co-PAA microgels were proven to have excellent anti-friction and anti-wear properties, depending on the temperature and pH values of the solutions. The maximum friction coefficient coincided with the lower critical solution temperature of the PNIPAM-co-PAA microgels at 32 °C. At the same time, the friction coefficient increased with the increase in pH value of the lubricant solution with the PNIPAM-co-PAA microgels. The unique thermal- and pH-sensitive properties of the PNIPAM-co-PAA microgels provided a new strategy for controlling the friction and wear of steel/CoCrMo alloy contacts under aqueous lubrication.


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Tribological behavior of thermal- and pH-sensitive microgels under steel/CoCrMo alloy contacts

Show Author's information Kequn SUN1Yuanhua HU1Yinghui DONG1Lulu YAO2Ruhong SONG1Yufu XU1( )
Institute of Tribology, School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China

Abstract

The tribological behavior of 316L stainless steel/CoCrMo alloy contacts under aqueous lubrication was investigated in this work. Three types of microgels including poly(N-isopropylacrylamide) (PNIPAM), polyacrylic acid (PAA), and poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-PAA) were prepared and used as lubricant additives in aqueous solutions. Tribological tests were conducted using a ball-on-disk reciprocating tribometer, over a range of temperatures, pH, and concentrations of the microgels. The PNIPAM-co-PAA microgels were proven to have excellent anti-friction and anti-wear properties, depending on the temperature and pH values of the solutions. The maximum friction coefficient coincided with the lower critical solution temperature of the PNIPAM-co-PAA microgels at 32 °C. At the same time, the friction coefficient increased with the increase in pH value of the lubricant solution with the PNIPAM-co-PAA microgels. The unique thermal- and pH-sensitive properties of the PNIPAM-co-PAA microgels provided a new strategy for controlling the friction and wear of steel/CoCrMo alloy contacts under aqueous lubrication.

Keywords: aqueous lubrication, pH-sensitive, microgel, poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-PAA), thermal-sensitive

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Publication history

Received: 05 January 2022
Revised: 10 February 2022
Accepted: 12 March 2022
Published: 11 July 2022
Issue date: April 2023

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© The author(s) 2022.

Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51875155). We express sincere gratitude to Professor Xianguo Hu, Kunhong Hu, and Associate Professor Enzhu Hu for their kind help.

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