Abstract
We aim to understand the tribological properties of graphene nanoplatelets (GNPs) reinforced hydroxyapatite (HA) composite coating synthesized using plasma spray on Ti alloy substrate (Ti-6Al-4 V). A significant reduction of 83% in wear volume loss is observed on addition of 2 wt. % GNPs in HA as compared to bare HA coating, respectively. Similarly, coefficient of friction (COF) shows the relative reduction of 70% is HA-2 wt. % GNP coating. Post-wear analysis by Raman spectroscopy confirms the retention of GNPs with the enlarged defect over the worn surface. FE-SEM investigation of worn surface shows the strengthening mechanism such as GNP bridging, GNP pull-out which could be attributed to enhanced wear resistance of the coating. GNPs induced lubrication has been observed as the prime reason for lower COF of the worn surface.
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Authors greatly acknowledge the financial and infrastructural facilities provided from Indian Institute of Technology, Patna, Bihar.
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Singh, S., Sharma, S. & Keshri, A.K. Tribological Behaviour of Plasma-Sprayed Graphene Nanoplatelets Reinforced Hydroxyapatite Nanocomposite Coating. Trans Indian Inst Met 74, 2901–2907 (2021). https://doi.org/10.1007/s12666-021-02367-7
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DOI: https://doi.org/10.1007/s12666-021-02367-7