Effect of calcium fluoride on mechanical behavior and sinterability of nano-hydroxyapatite and titania composites

Yilmaz, Bengi
Evis, Zafer
USTA, Metin
Composites of nano-hydroxyapatite (HA) - titania (TiO2) with or without calcium fluoride (CaF2) were synthesized and sintered at 900 degrees C, 1100 degrees C, and 1300 degrees C. The composites were studied to assess the effect of CaF2 addition on the sinterability, structure, functional groups, morphology and mechanical behavior of the material. The resultant composites were characterized by XRD, ATR-FTIR, SEM and microhardness measurement, respectively. It was seen that the addition of CaF2 into HA-TiO2 composites enhanced the densification via reducing the porosity of the composites. The XRD results showed that as the amount of TiO2 in the composites was increased, transformation of HA into tricalcium phosphate (TCP) was favored due to the formation of calcium titanate (CaTiO3). On the other hand, the addition of CaF2 into the composites led to the shrinkage of unit cell volume of HA due to the substitution of F ions into HA and suppressed the decomposition of HA in these composites. Moreover, the addition of CaF2 also improved the microhardness of the composites. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Effects of nanoparticles on thermal degradation of polylactide/aluminium diethylphosphinate composites
Kaya, Hatice; Özdemir, Esra; Kaynak, Cevdet; Hacaloğlu, Jale (2016-03-01)
We investigated the thermal degradation characteristics of polylactide (PLA) aluminium diethylphosphinate (AlPi) composites involving SiO2, halloysite (HNT) and organically modified montmorillonite (OMMT) via direct pyrolysis mass spectrometry. Presence of nanoparticles, SiO2, HNT and OMMT affected both thermal stability and relative yields of thermal degradation products of PLA/AlPi. The transesterification reactions and interactions between PLA and AlPi were depressed in the presence of SiO2 and HNT. The ...
Effects of silica nanoparticles on the performance of water-based drilling fluids
Kök, Mustafa Verşan; Bal, Berk (2019-09-01)
In this research, two groups of experiments were conducted to investigate the effects of silica (SiO2) nanoparticles on the filtration and rheological properties of water-based drilling fluids. In the first group, bentonite, chrome-free lignosulfonate (CFL) and carboxymethyl cellulose (CMC) were used in different concentrations to obtain base fluids. Nanofluids were prepared by adding 0.5 g of four different silica nanoparticles into these drilling fluids. Comparison of rheological properties, fluid loss am...
Effect of metal oxide on light oil combustion - TA and kinetic analysis
Kök, Mustafa Verşan (Springer Science and Business Media LLC, 2003-01-01)
Simultaneous thermogravimetry (TG) and differential thermal analysis (DTA) were applied to light crude oil combustion in the presence and absence of metal oxide. In crude oil-limestone mixture, three main transitional stages are detected. These are distillation, low-temperature oxidation (LTO) and high temperature oxidation (HTO) regions respectively. In the case of experiments with Fe(III)chloride at different amounts, the shape of TG-DTA curve is changed considerably. Kinetic parameters of the samples are...
Effect of heat treatment on nickel manganite thin film thermistors deposited by electron beam evaporation
Parlak, Mehmet; Hogan, M.J.; Brinkman, A.W. (1999-05-21)
Thin ®lms of nickel manganite were deposited onto different substrates by means of electron beam evaporation from a powder source of the compound and annealed at 500 and 6008C for 30 min. in air, oxygen or nitrogen to study the effects of annealing temperature and atmosphere on the structure and properties of grown thin ®lms. X-ray diffraction and infrared spectroscopy were used to con®rm the formation of nickel manganite; the integrity of the ®lms and their elemental compositions were assessed using a scan...
Effect of Calcination on Microstructure and Antibacterial Activity of Silver-Containing Silica Coatings
Durucan, Caner (Wiley, 2010-05-01)
Silver nanoparticle containing silica coatings on soda-lime glass were prepared by the sol-gel process The effect of thermal densification treatment at different temperatures in the range of 100-700 degrees C on microstructure and antibacterial properties of the coatings were examined The structural characterization of the coatings was performed by using scanning electron microscope, X-ray diffraction, UV-visible and X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM) The antibacterial...
Citation Formats
I. KUTBAY, B. Yilmaz, Z. Evis, and M. USTA, “Effect of calcium fluoride on mechanical behavior and sinterability of nano-hydroxyapatite and titania composites,” CERAMICS INTERNATIONAL, pp. 14817–14826, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32780.