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Title: Plasma Sprayed Graphene Reinforced Hydroxyapatite Nano Composite Coating with Improved Crystallinity, Mechanical, Tribological and Corrosion Properies
Authors: Premkumar, S. S.
Keywords: Material Science
Issue Date: 2020
Publisher: IIT Patna
Series/Report no.: TH-148;
Abstract: Graphene nanoplatelets (GNPs) (~1-2 wt. %) reinforced hydroxyapatite (HA) coating was fabricated on Ti-6Al-4V substrate through atmospheric plasma spraying. Plasma process parameter i.e. plasma power was varied from 15 kW to 35 kW for all three different compositions of the coating i.e. HA, HA-1 wt. % GNP and HA-2 wt. % GNP. For the coating synthesized at all plasma power, GNPs were found to be retained. Increase in plasma power from 15 kW to 35 kW leads to decrease in crystallinity for all three compositions of coating, while it increases with the addition of GNPs. Further, Increment in plasma power from 15 kW to 35 kW leads to significant enhancement in hardness, elastic modulus and fracture toughness up to 81.41 %, 149.26 % and 282.40 % respectively in HA-2 wt. % GNPs coating, while it improved to 20.13 %, 50.75 % and 173.14 % respectively on the addition of 2 wt. % GNPs in HA coating fabricated at 35 kW. Enhancement in hardness, elastic modulus and fracture toughness was due to three simultaneous reasons: (1) Reduction in porosity (2) Uniform dispersion of GNPs and (3) Toughening mechanism offered by GNPs. On increasing plasma power from 15 kW to 35 kW leads to a significant reduction in wear rate and corrosion current i.e. icorr up to 62.42 % and 74 % respectively in H-2G coating. In addition, reinforcement 2 wt. % GNPs in HA, drastically reduces the wear rate and icorr up to 85.81 % and 71 % compared to HA coatings fabricated at 35 kW. Enhancement of wear and corrosion resistance on addition of GNPs in HA could be attributed to the reduction in porosity, and uniform dispersion of GNPs. Significant enhancement in tribo-corrosion was also been observed by varying plasma power and GNPs content. Further, the addition of GNPs showed a remarkable improvement in the rate of cell proliferation in the HA coating.
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