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Friction 2023, 11(4): 489-512 https://doi.org/10.1007/s40544-022-0637-2
Review Article | Open Access | Issue | Published: 18 November 2022

A review of current understanding in tribochemical reactions involving lubricant additives

Show Author's Information Yan CHEN1,  Peter RENNER2,  Hong LIANG1,2( )
Department of Materials Science and Engineering, Texas A&M University, College Station 77843, USA
J. Mike Walker ’66 Department of Mechanical Engineering, Texas A&M University, College Station 77843, USA
Keywords:
lubricant additives, nanoparticles (NPs), ionic liquids (ILs), tribochemical reactions, oil-soluble organics
Cite this article:
CHEN Y, RENNER P, LIANG H. A review of current understanding in tribochemical reactions involving lubricant additives. Friction, 2023, 11(4): 489-512. https://doi.org/10.1007/s40544-022-0637-2
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Abstract Full text About this article

Lubricants have played important roles in friction and wear reduction and increasing efficiency of mechanical systems. To optimize tribological performance, chemical reactions between a lubricant and a substrate must be designed strategically. Tribochemical reactions are chemical reactions enabled or accelerated by mechanical stimuli. Tribochemically activated lubricant additives play important roles in these reactions. In this review, current understanding in mechanisms of chemical reactions under shear has been discussed. Additives such as oil-soluble organics, ionic liquids (ILs), and nanoparticles (NPs) were analyzed in relation to the tribochemical reaction routes with elements in metallic substrates. The results indicated that phosphorus, sulfur, fluorine, and nitrogen are key elements for tribochemical reactions. The resulting tribofilms from zinc dithiophosphates (ZDDP) and molybdenum dithiocarbamate (MoDTC) have been widely reported, yet that from ILs and NPs need to investigate further. This review serves as a reference for researchers to design and optimize new lubricants.


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About this article

A review of current understanding in tribochemical reactions involving lubricant additives

Show Author's information Yan CHEN1, Peter RENNER2, Hong LIANG1,2( )
Department of Materials Science and Engineering, Texas A&M University, College Station 77843, USA
J. Mike Walker ’66 Department of Mechanical Engineering, Texas A&M University, College Station 77843, USA

Abstract

Lubricants have played important roles in friction and wear reduction and increasing efficiency of mechanical systems. To optimize tribological performance, chemical reactions between a lubricant and a substrate must be designed strategically. Tribochemical reactions are chemical reactions enabled or accelerated by mechanical stimuli. Tribochemically activated lubricant additives play important roles in these reactions. In this review, current understanding in mechanisms of chemical reactions under shear has been discussed. Additives such as oil-soluble organics, ionic liquids (ILs), and nanoparticles (NPs) were analyzed in relation to the tribochemical reaction routes with elements in metallic substrates. The results indicated that phosphorus, sulfur, fluorine, and nitrogen are key elements for tribochemical reactions. The resulting tribofilms from zinc dithiophosphates (ZDDP) and molybdenum dithiocarbamate (MoDTC) have been widely reported, yet that from ILs and NPs need to investigate further. This review serves as a reference for researchers to design and optimize new lubricants.

Keywords: lubricant additives, nanoparticles (NPs), ionic liquids (ILs), tribochemical reactions, oil-soluble organics

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Received: 03 April 2021
Revised: 25 November 2021
Accepted: 21 April 2022
Published: 18 November 2022
Issue date: April 2023

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