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OKTAR, FAİK NÜZHET

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OKTAR

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FAİK NÜZHET

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2007 - 200912010 - 20171
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Author: ERKMEN, ZİYA ENGİN ×

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    Microstructural and mechanical properties of hydroxyapatite-zirconia composites
    (WILEY, 2007) OKTAR, FAİK NÜZHET; Erkmen, Z. E.; Genc, Y.; Oktar, F. N.
    This work focuses on the improvement of the mechanical properties of hydroxyapatite (HA) through the addition of 3 mol% yttria partially stabilized zirconia (PSZ). Enamel-derived HA (EHA) from freshly extracted human teeth and commercial HA (CHA) were chosen as the matrix. The effects of addition up to 10 wt% of PSZ and of sintering temperature (1000 degrees-1300 degrees C) on the density, microhardness, and compression strength were evaluated. For EHA-PSZ composites, the density and mechanical properties were generally enhanced by adding 5 wt% PSZ, especially after sintering at 1200 degrees C, whereas CHA-PSZ composites showed lower strength values at sintering temperatures of 1200 degrees and 1300 degrees C with respect to EHA-PSZ composites. This may be due to the lower stability of CHA-PSZ composites with higher amounts of calcium zirconate formed over 1100 degrees C when compared with EHA-PSZ composites.
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    Sintering effects of mullite-doping on mechanical properties of bovine hydroxyapatite
    (ELSEVIER SCIENCE BV, 2017) OKTAR, FAİK NÜZHET; Yetmez, M.; Erkmen, Z. E.; Kalkandelen, C.; Ficai, A.; Oktar, F. N.
    In this study, sintering effects on microstructural behavior of bovine derived hydroxyapatite doped with powder mullite are considered in the temperature range between 1000 C-omicron and 1300 C-omicron. Results show that maximum values of both compressive strength and microhardness are achieved in the samples sintered at 1200 C-omicron for all mullite additions of 5, 7.5, 10 and 12.5 wt. Moreover, above 1000 C-omicron, decomposition of HA and new phase formations such as whitlockite and gehlenite play a major role in both compressive strength and microhardness properties which increase up to 10 wt mullite reinforcement. (C) 2017 Elsevier B.V. All rights reserved.