| Preparation and characterization of nanocomposite graphene oxide – polyvinylpyrrolidone coating on Ti6Al4V alloy for improvement of tribological behavior |
| Paper ID : 1234-UFGNSM-FULL (R1) |
| Authors: |
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mahboobeh sadeghi *1, Mahshid Kharaziha2, Hamid reza Salimi jazi3 1No 54, Bahar 5th Alley, Lale st, Jey Ave. 2department of materials science, Isfahan university of technology 3Department Materials science, Isfahan University of Technology |
| Abstract: |
| Over time, number of joints diseases, especially the knee joint as the largest and the strongest joint in the human body, has been continusly enhanced. To overcome this issue, various types of metallic based implants have been applied. Titanium alloys especially Ti6Al4V alloy possess high corrosion resistance, excellent biocompatibility, and the highest strength to weight ratio among the metallic biomaterials. Despite having desirable properties mentioned above, titanium alloys reveal weak tribological properties. The aim of this research was preparation and characterization of nanocomposite coatings consisting of graphene oxide (GO)-polyvinilpyrolidone (PVP) to improve the tribological properties of Ti6Al4V alloy. Before coating process, GO nanosheets were dispersed in 2-propanol solution and PVP with Tanic acid were dispersed in ethanol solution. After 2h ultrasonication of suspensions, the solutions were provided for electrophoretic deposition. Electrophoretic deposition was applied in order to coat Ti6Al4V alloy. In this regard, 0.5 mg GO nanosheets were dispersed in 10 ml solution of 2-propanol as first solution. Second soluton for EPD contained 1 g L-1 TA, 1 g L-1 PVP in ethanol in order to obtain a coating with desire properties, electrophoretic deposition parameters consisting of voltage 60 V and times 10 min for sirst one and 30V and 10 min for second one, were optimized. To evaluate physical and chemical properties of coating, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were applied. Moreover, in order to evaluate tribological properties of nanocomposite coatings, wear test was carried out. Results revealed the successful formation of nanocomposite coating depending on the solvent type and electrophoretic parameters (voltage and time). Moreover, nanocomposite coatings consisting of higher amount of GO content significantly reduced friction compared to Ti6Al4V. Moreover, GO-PVP nanocomposite coating significantly improved both wear resistance and microhardness of alloy. |
| Keywords: |
| Ti6Al4V alloy, nanocomposite coating, graphene oxide, polyvinilpyrolidone, electrophoretic deposition |
| Status : Paper Accepted (Poster Presentation) |
