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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 Effect of alloying elements to aluminium on the wettability of AL/SiC system(2002) Candan, E.The wettability at a liquid Al-alloy/SiC interface was evaluated by the sessile drop method at 750°C. The wetting angle, ?, of a sessile drop on SiC substrate decreased with the addition of Pb, Mg and Ca to pure aluminium. The reduction in ? of the Al-Pb alloy was proportional to the reduction in surface tension, ?lv of aluminium, whereas in Al-Mg and Al-Ca alloys the reduction in ? was greater than the reduction in ?lv of Al. This was attributed to reactions that took place at the Al-alloy/SiC interface. Scanning electron microcopy (SEM) analysis showed that severe interactions had taken place at the interfaces of Al-Mg alloy/SiC and Al-Ca alloy/SiC.Öğe Effect of the particle size on the mechanical properties of 60 vol.% SiCp reinforced Al matrix composites(Walter De Gruyter Gmbh, 2002) Ahlatci, H.; Candan, E.; Cimenoglu, H.The effect of the reinforcing particle size on the mechanical properties of 60 vol.% SiC reinforced aluminium matrix composites produced by the pressure infiltration technique was examined by compression, impact and wear tests. The compression strength and the impact resistance decreased with increasing reinforcing particle size. The composites exhibited different abrasion behaviour depending on the size of abrasive Al2O3 grains. On fine abrasive Al2O3 grains (85 mu m), the abrasion resistance increased with increasing reinforcing SiC particle size. The contrary result was obtained on coarse abrasive Al2O3 grains (250 mu m). The wear tests conducted on M2 quality tool steel revealed that reinforcing of aluminium with coarse SiC particles has a very beneficial effect on the wear resistance with respect to fine reinforcing SiC particles.Öğe Effect of Ti on the Corrosion Behaviour of In-Situ Mg2Si Particle Reinforced Al-12Si-20Mg-XTi Alloys(Trans Tech Publications Ltd, 2010) Ahlatci, H.; Durmaz, A.; Balta, A.; Acarer, M.; Candan, E.In this study, corrosion behaviour of Al-12Si-20Mg-XTi alloys (Ti content varied between 0 and 4 wt.%) was investigated. Characterizations of the alloys were carried out by microstructural examinations and corrosion tests. Microstructural results showed that precipitation of the Mg2Si phases was observed in Al-12Si-20Mg-XTi alloy matrix as two different morphologies; i.e. as a polyhedral primary particle and as a chinese script. Upon addition of Ti, Al3Ti intermetallic precipitated in the alloy. Corrosion tests were carried out by immersing the alloys in 30 g/l NaCl+10 ml/l HCl solution. Evaluation of corrosion was determined by measuring weight loss for 24 hours and by potentiodynamic polarization tests. Corrosion resistance of the alloy was approximately constant with 1 wt % Ti addition whereas at higher additions, the corrosion rate increased.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 Measurement and prediction of contact angles of Pb-free Sn-Ag solder alloys on Cu substrate(Cambridge Univ Press, 2011) Erer, A. M.; Candan, E.; Guven, M. H.; Turen, Y.The contact angle (Theta) of molten Sn and Sn-Ag alloys (0.5, 1.5, 3.5, 6 wt.% Ag) on Cu substrates have been studied by using sessile drop method at various temperatures (230, 250, 275 and 300 degrees C). Experimental results showed that additions of Ag to Sn resulted in a continuous decrease in the Theta up to 3.5 wt.% above which the Theta value was increased. Increasing alloy temperature also decreased the Theta proportionally. Experimental results revealed that a correlation between the Theta, alloy composition and the alloy temperature exists which yielded an empirical model to predict the Theta at a given Ag content and temperature for a given Sn-Ag alloy. The empirical model predicts the Theta reasonably well with the present work and the other published works.
