In this work, the study of thermal treatment by laser, plasma glow discharge, and tubular furnace on Ti-6Al-4V alloy coated with hydroxyapatite (HA) by methods of dip coating and electrophoretic deposition. The effect of pulsed Nd:YAG laser , oxygen plasma and tubular furnace treatments on structure, morphology and corrosion resistance of HA coating -Ti6Al4V alloy samples were thermal reported. The samples were tested by optical microscope, XRD, SEM, and the corrosion characteristic with open circuit potential (OCP) and polarization curve (Tafel). The results showed that the samples thermal reported by tubular furnace were the best where the corrosion rate was reduced to 3.567×10 -4 mm/y for the dip-coated samples and 7.221×10 -4 mm/y for the electrophoretically deposited samples compared with 9.396×10 -3 mm/y for uncoated sample. It was found that the heat, laser and plasma treatment enhanced the structure and corrosion resistance properties of the HA coating on Ti6Al4V substrate for use in biomedical applications. This research demonstrates a new low-cost approach to produce high corrosion resistance biocompatible materials.
In this report, TiN nanocrystalline thin films were deposited on glass and Ti-6Al-4V substrates using a DC-magnetron sputtering technique. The TiN films were sputtered using a pure Ti target (99.9%) with 40W of power in Ar/N2 gas mixture atmosphere. The structure of the TiN films was characterized by X-Ray diffraction, as prepared films exhibited a (200) preferred orientation, while film annealed at 500 °C shows the (111), (200) and (311). Polycrystalline, cubic, (111)-orientated TiN films were produced by annealing temperature of 500 °C. The effect of deposited temperature on the microstructural morphologies of the thin films was studied by Field Emission Scanning Electron Microscope (FESEM). The particle size of the sputtered TiN films ranged from 50 to 70 nm and was strongly influenced by annealing temperatures, the morphology of the films deposited before and after annealing has a characteristic agglomeration of particles. Potentiodynamic polarization analysis of the TiN films confirms the inverse relationship between polarization resistance and corrosion current. The biocorrosion measurements for TiN films deposited on the Ti-6Al-4V substrate in 3.5% NaCl solution have also been obtained. Clear improvement in the corrosion resistance was observed rather than for untreated, especially for thermally annealed (500 oC) TiN/Ti-6Al-4V samples. The corrosion rate was 0.1458 mm/y for the uncoated sample, while 2.68510-4 mm/y for TiN/Ti-6Al-4V in samples after annealing. The average corrosion potential calculated was - 0.117 V. The results confirmed that coated alloys with 500 °C thermally treated exhibited a better electrochemical behavior compare with uncoated and non-thermally treated alloys possibly due to the better cohesion degree of the coatings.
In the current work, improvement of the optical properties of Polyaniline (PAni) films was investigated using cold plasma technique. Samples were treated with different gases including argon (Ar), oxygen (O2), nitrogen (N2) and Ar/O2 mixture using low-pressure dc glow discharge. Films of about 300 nm were fabricated by simple deposition of polyaniline suspension in toluene on glass slides. UV-Vis spectrophotometric measurements of the prepared films showed that plasma treatment resulted in a significant increase in the optical band gap of the films. Plasma treatment was found to increase the band gap energies range from (1.7-1.98 eV) of the untreated films to 1.8-2.42 eV of the treated ones. Exposure to oxygen plasma was found to alter the chemical composition of the films and thus, resulting in a high transmission (over 85%) of the peak centred at 550 nm. This increases the photoelectric performance of the plasma treated polyaniline films
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