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Friction 2023, 11(1): 48-63 https://doi.org/10.1007/s40544-021-0571-8
Research Article | Open Access | Issue | Published: 23 April 2022

Study on the mechanism of rapid formation of ultra-thick tribofilm by CeO2 nano additive and ZDDP

Show Author's Information Xue LEI,  Yujuan ZHANG( ),  Shengmao ZHANG( ),  Guangbin YANG,  Chunli ZHANG,  Pingyu ZHANG
National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China
Keywords:
adsorption, CeO2 nanoadditives, nanocomposite ultra-thick tribofilm, zinc dioctyl dithiophosphate (ZDDP)
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LEI X, ZHANG Y, ZHANG S, et al. Study on the mechanism of rapid formation of ultra-thick tribofilm by CeO2 nano additive and ZDDP. Friction, 2023, 11(1): 48-63. https://doi.org/10.1007/s40544-021-0571-8
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Abstract Full text Electronic supplementary material About this article

CeO2 nanoparticles are potential anti-wear additives because of their outstanding anti-wear and load-bearing capacity. However, the shear-sintering tribo-film formation mechanism of oxide nanoparticles limits the tribo-film formation rate and thickness greatly. In this study, by compounding with zinc dioctyl dithiophosphate (ZDDP), ultra-fine CeO2 nanoparticles modified with oleylamine (OM) can quickly form 2 μm ultra-thick tribo-film, which is 10‒15 times thicker than that of ZDDP and CeO2, respectively. The ultra-thick tribo-film presents a nanocomposite structure with amorphous phosphate as binder and nano-CeO2 as filling phase, which leads to the highest loading capacity of composite additives. The results of adsorption experiments tested by dissipative quartz crystal microbalance (QCM-D) showed that the PB value of additive has nothing to do with its equilibrium adsorption mass, but is directly proportional to its adsorption rate in 10 s. The compound additive of CeO2 and ZDDP presented the co-deposition mode of ZDDP monolayer rigid adsorption and CeO2 viscoelastic adsorption on the metal surface, which showed the highest adsorption rate in 10 s. It is found that the tribo-film must have high film forming rate and wear resistance at the same time in order to achieve super thickness. Cerium phosphate was formed from ZDDP and CeO2 through tribochemistry reaction, which promotes the formation of an ultra-thick tribo-film with nanocomposite structure, which not only maintains the low friction characteristics of CeO2, but also realizes high PB and high load-carrying capacity.


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About this article

Study on the mechanism of rapid formation of ultra-thick tribofilm by CeO2 nano additive and ZDDP

Show Author's information Xue LEI, Yujuan ZHANG( ), Shengmao ZHANG( ), Guangbin YANG, Chunli ZHANG, Pingyu ZHANG
National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China

Abstract

CeO2 nanoparticles are potential anti-wear additives because of their outstanding anti-wear and load-bearing capacity. However, the shear-sintering tribo-film formation mechanism of oxide nanoparticles limits the tribo-film formation rate and thickness greatly. In this study, by compounding with zinc dioctyl dithiophosphate (ZDDP), ultra-fine CeO2 nanoparticles modified with oleylamine (OM) can quickly form 2 μm ultra-thick tribo-film, which is 10‒15 times thicker than that of ZDDP and CeO2, respectively. The ultra-thick tribo-film presents a nanocomposite structure with amorphous phosphate as binder and nano-CeO2 as filling phase, which leads to the highest loading capacity of composite additives. The results of adsorption experiments tested by dissipative quartz crystal microbalance (QCM-D) showed that the PB value of additive has nothing to do with its equilibrium adsorption mass, but is directly proportional to its adsorption rate in 10 s. The compound additive of CeO2 and ZDDP presented the co-deposition mode of ZDDP monolayer rigid adsorption and CeO2 viscoelastic adsorption on the metal surface, which showed the highest adsorption rate in 10 s. It is found that the tribo-film must have high film forming rate and wear resistance at the same time in order to achieve super thickness. Cerium phosphate was formed from ZDDP and CeO2 through tribochemistry reaction, which promotes the formation of an ultra-thick tribo-film with nanocomposite structure, which not only maintains the low friction characteristics of CeO2, but also realizes high PB and high load-carrying capacity.

Keywords: adsorption, CeO2 nanoadditives, nanocomposite ultra-thick tribofilm, zinc dioctyl dithiophosphate (ZDDP)

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Publication history

Received: 24 August 2021
Revised: 19 October 2021
Accepted: 11 November 2021
Published: 23 April 2022
Issue date: January 2023

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© The author(s) 2021.

Acknowledgements

We acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 51875172 and 51775168), Scientific and Technological Innovation Team of Henan Province Universities (No. 19IRTSTHN024), and Zhongyuan Science and Technology Innovation Leadership Program (No. 214200510024).

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