An investigation of the microstructural and mechanical properties of tri-calcium phosphates doped with aluminum and fluoride ions

Download
index.pdf
2011
Tahmasebifar, Aydin
Show full item record
189
views
102
downloads
The aim of this study was to investigate the microstructure and mechanical properties of pure tricalcium phosphate (TCP) and tricalcium phosphates doped with aluminum (Al3+) and fluoride (F-) ions at different compositions. TCP was synthesized via precipitation method and sintered at 1100C for 1 and 5 h. It was observed that density and relative density of the sintered materials were decreased by extending the sintering time. Increased densities were achieved upon Al3+ and/or F- doping. For structural analysis, XRD, SEM and FTIR spectroscopy examinations were performed. Second phases were observed in XRD studies upon doping. Due to Al3+ and F- substitution, hydroxyapatite (HA) phase was detected besides β-TCP, resulting in the formation of HA/β-TCP biphasic composites with different compositions. SEM results revealed that addition of doping ions resulted in smaller grains. In FTIR analysis, in addition to the characteristic bands of TCP, novel bands indicating the substitution of F- ions were observed in F- ion doped samples. In general, the micro hardness test revealed that Al3+ ions in large amounts had negative effects on the mechanical properties of the samples, while substitution of the F- ions had a positive effect on their mechanical properties.
Metallurgy.
http://etd.lib.metu.edu.tr/upload/12613553/index.pdf
https://hdl.handle.net/11511/21014
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Development of lead alloys for valve-regulated lead-acid (VRLA) batteries
Halıcı, Şafak; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2010)
In this study, Mg, Sn, Cd, Bi and Sb containing, five binary, three ternary and two quaternary different alloys to be used in a Valve-Regulated Lead-Acid (VRLA) batteries have been studied in terms of their mechanical and electrochemical properties. The investigated properties are hardness, passivity, corrosion rate, hydrogen gassing and the conductivity of the passive film. All electrochemical tests were carried out in 3.75 M H2SO4 solution by using open-circuit potential, anodic polarization, polarization...
Investigation and development of possible leaching processes for recovery of zinc and lead from çinkur leach residues
Sunkar, Ahmet Semih; Topkaya, Yavuz Ali; Department of Metallurgical and Materials Engineering (2005)
The major aim of this study was to investigate various leaching methods for the recovery of zinc and lead from blended neutral leach residues of Çinkur having a composition of 12.59 % Zn, 15.21 % Pb, 6.45 % Fe, 0.054 % Cd. Initially water leaching tests were performed at various conditions of leaching temperature, reaction time and particle size. The optimized conditions for water leaching were found to be 2 h, 95?C and 250 g/l pulp density with a final pH of 5.9. However, the zinc recovery value of 10.26 %...
Hot dynamic consolidation of aifevsi alloy powders
Kotan, Şevkiye Ezgi; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2005)
The experimental alloy powders of 1% Mg treated Al-8Fe-1.8V-8Si were obtained by air atomization. The screen analysis of powders was made by sieves with meshes ranging from +90æm, +63æm, +53æm, +45æm, +38æm to -38æm. Unreinforced and TiC particulate reinforced specimens were produced by hot dynamic consolidation which is known as hot swaging. Powders were canned into pure aluminium tubes of about 10cm length and 2.2cm diameter. Single action and double action cold pressing were applied to some of the specim...
Investigation of the effect of orientation and heat treatment on the stress corrosion cracking susceptibility of 7050 aluminium alloy
Çevik, Gül; Doruk, Mustafa; Department of Metallurgical and Materials Engineering (2004)
In the present work, the effect of variation in specimen orientation and heat treatment on the Stress Corrosion Cracking (SCC) susceptibility of 7050 aluminum alloy was investigated in 3,5% NaCl solution and under freely corroding conditions. For this purpose, Constant Extension Rate Tests (CERT) was performed on precracked Compact Tension (CT) specimens and the Direct Current Potential Drop technique was applied to measure the crack lengths. In addition to crack length versus time curves, the relationship ...
Characterization of magnetite thin films produced by sol-gel processing
Eken, Ali Erdem; Özenbaş, Ahmet Macit; Department of Metallurgical and Materials Engineering (2008)
Magnetite (Fe3O4) thin films were prepared by a sol-gel process in which, a solution of iron (III) nitrate dissolved in ethylene glycol was applied on glass substrates by spin coating. Xerogel films were obtained by drying the coated films at 110 °C. The films were sintered between 300 °C and 450 °C in order to observe the phases existing in the films at different temperatures. Coating solution showed Newtonian behaviour and viscosity was found as 0.0215 Pa.s. DTA analysis showed that, sintering temperature...
Citation Formats
A. Tahmasebifar, “An investigation of the microstructural and mechanical properties of tri-calcium phosphates doped with aluminum and fluoride ions,” M.S. - Master of Science, Middle East Technical University, 2011.
METU IIS - Integrated Information Service open@metu.edu.tr