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Öğe Corrosion resistance of powder injection moulded titanium in physiologic serum and artificial saliva(Chinese Acad Sciences, Inst Metal Research, 2010) Candan, S.; Turkmen, M.; Ahlatci, H.; Candan, E.Most of dental implants are made from titanium or titanium based alloys. However, one of the drawback of such implants is high cost due to the technological difficulties in casting method or machining. In this work, powder injection moulding (PIM) method has been used in order to explore lower cost implants without minimising the biocorrosion resistance of the titanium. Corrosion resistance of titanium specimens, produced by powder injection moulding method (PIM-Ti), in physiologic serum and artificial saliva was investigated. Commercially pure bulk Ti (CP-Ti) was used as control sample. Surface oxidation was also carried out to both PIM-Ti and CP-Ti samples. Microstructure and corrosion resistance were investigated using microhardness, X-ray diffraction (XRD), scanning electron microscopy (SEM) and potentiodynamic polarization experiments. Resulting microstructure of PIM-Ti samples contained porosity as compared to CP-Ti control samples. Microhardness of PIM-Ti samples varied with varying applied load whereas it was free from applied load for CP-Ti control samples. Polarisation measurements and SEM analysis revealed that corrosion behaviour of PIM-Ti was reasonably as good as CP-Ti both in as-produced and oxidized conditions in physiologic serum and artificial saliva in spite of its porous structure.Öğe Corrosion resistance of powder injection moulded titanium in physiologic serum and artificial saliva(2010) Candan, S.; Turkmen, M.; Ahlatci, H.; Candan, E.Most of dental implants are made from titanium or titanium based alloys. How- ever, one of the drawback of such implants is high cost due to the technological di°culties in casting method or machining. In this work, powder injection moulding (PIM) method has been used in order to explore lower cost implants without min- imising the biocorrosion resistance of the titanium. Corrosion resistance of titanium specimens, produced by powder injection moulding method (PIM-Ti), in physiologic serum and artificial saliva was investigated. Commercially pure bulk Ti (CP-Ti) was used as control sample. Surface oxidation was also carried out to both PIM- Ti and CP-Ti samples. Microstructure and corrosion resistance were investigated using microhardness, X-ray diffraction (XRD), scanning electron microscopy (SEM) and potentiodynamic polarization experiments. Resulting microstructure of PIM-Ti samples contained porosity as compared to CP-Ti control samples. Microhardness of PIM-Ti samples varied with varying applied load whereas it was free from applied load for CP-Ti control samples. Polarisation measurements and SEM analysis re- vealed that corrosion behaviour of PIM-Ti was reasonably as good as CP-Ti both in as-produced and oxidized conditions in physiologic serum and artificial saliva in spite of its porous structure.Öğe Effects of titanium addition on mechanical and corrosion behaviours of AZ91 magnesium alloy(Elsevier Science Sa, 2011) Candan, S.; Unal, M.; Koc, E.; Turen, Y.; Candan, E.The mechanical properties and corrosion behaviour of AZ91 magnesium alloy containing 0.2-0.5 wt.% Ti were investigated in this study. Results demonstrate that the enhancement of the ultimate tensile strength by 18% and yield strength by 47% can be achieved by Ti addition. The corrosion behaviour was evaluated by immersion tests and potentiodynamic polarisation measurements in 3.5% NaCl solution. The results from the immersion tests and potentiodynamic polarisation measurements showed that the corrosion resistance of AZ91 alloy increased progressively with the increase of the Ti content of the alloy. Compared to AZ91 alloy, 0.5Ti addition increased the corrosion resistance by up to 45 fold. The mechanism of property enhancement is ascribed to both the suppression of partially divorced beta-Mg17Al12 eutectics and an increased Al content in alpha-Mg solid solution by Ti addition in AZ91 alloy. (C) 2010 Elsevier B.V. All rights reserved.Öğe Improvement of mechanical and corrosion properties of magnesium alloy by lead addition(Elsevier Science Sa, 2009) Candan, S.; Unal, M.; Turkmen, M.; Koc, E.; Turen, Y.; Candan, E.Mechanical properties and corrosion behaviour of AZ91 magnesium alloy containing 0.2-1.0 wt.% Pb were investigated. An enhancement of ultimate tensile strength by 42%, yield strength by 58% and elongation by 20% can be achieved by Pb addition. Corrosion resistance of the AZ91 alloy also increased progressively with increasing Pb content. The mechanism of property enhancement is ascribed to the suppression of intermetallic phases (beta-Mg17Al12 and alpha-Mg+beta eutectic) by Pb addition. (c) 2008 Elsevier B.V. All rights reserved.Öğe Radio frequency-induced plasma polymerization of allyl alcohol and 1-propanol(2002) Candan, S.The effect of the composite parameters' plasma power (P)-to-monomer flow rate (ø) ratio (P/ø) in the plasma polymerization of allyl alcohol and 1-propanol was studied. The radio-frequency plasmas of deposits operated at low power (1-15 W) were investigated using deposition rate measurements. Detailed chemical information on the plasma polymers was obtained by X-ray photoelectron spectroscopy (XPS). The study of the surface chemistry of films created from allyl alcohol and 1-propanol demonstrates the importance of the double bond for good C-O group retention. The deposition rates of both plasma polymers were found to increase with increasing P. The comparison of the deposition rates of plasma-deposited allyl alcohol and 1-propanol suggests that the double bond is involved in the deposition mechanism.
