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Effect of Graphene-Based Nanoadditives on the Tribological and Rheological Performance of Paraffin Grease

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Abstract

The present study deals with tribological and rheological evaluations of paraffin grease having variable dosages (0.01-0.05 wt.%) of graphene oxide (GO), reduced graphene oxide (rGO), and octadecylamine-functionalized GO (GO-ODA). The microstructural and chemical characteristics of GO, rGO, and GO-ODA were analyzed by HRTEM, XRD, and FTIR. The graphene-based nanoadditives significantly improved the tribological properties between the steel tribo-pair by decreasing the wear and friction. The optimized dose of GO, rGO, and GO-ODA decreased the coefficient of friction (COF) by ~ 34.3, ~ 50.3, and ~ 34.3%, and wear volume by ~ 86.6, ~ 85.4, and ~ 80.9%, respectively. The friction reduction by GO, rGO, and GO-ODA nanoadditives conserved the energy by ~ 34.3, ~ 50.3, and ~ 34.4%, respectively. The spectroscopic and microscopic analyses of worn surfaces suggested the formation of graphene-based tribo-film, which facilitated the shearing under tribo-stress and protected the tribo-interfaces against the wear. The rheological results corroborate the roles of graphene-based nanoadditives and lube oil of grease under the tribo-stress, which is vital for the sustainability of tribo-film on the interacting surfaces. The graphene-based tribo-film reduced the friction, subsidized the wear, and conserved energy consumption.

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Acknowledgments

The authors would like to acknowledge the Department of Mechanical Engineering and Central Instrument Facility, IIT (BHU), Varanasi, and CSIR-IIP, Dehradun, for analytical support. Authors SSR and AC acknowledge MHRD and UGC, Govt. of India for fellowship support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India

    Sooraj Singh Rawat & A. P. Harsha

  2. Chemical and Material Sciences Division, CSIR-Indian Institute of Petroleum, Dehradun, 248005, India

    Ajay Chouhan & O. P. Khatri

  3. Academy of Scientific & Innovative Research, Ghaziabad, 201002, India

    Ajay Chouhan & O. P. Khatri

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  1. Sooraj Singh Rawat
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  2. A. P. Harsha
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  4. O. P. Khatri
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Correspondence to A. P. Harsha.

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Rawat, S.S., Harsha, A.P., Chouhan, A. et al. Effect of Graphene-Based Nanoadditives on the Tribological and Rheological Performance of Paraffin Grease. J. of Materi Eng and Perform 29, 2235–2247 (2020). https://doi.org/10.1007/s11665-020-04789-8

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