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OKTAR, FAİK NÜZHET

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OKTAR

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FAİK NÜZHET

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2007 - 200912010 - 20191
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    Studies on goat hydroxyapatite/commercial inert glass biocomposites
    (SPRINGER, 2019) OKTAR, FAİK NÜZHET; Akyurt, N.; Yetmez, M.; Oktar, F. N.
    In this study, mechanical properties and microstructural analysis of goat-derived hydroxyapatite/commercial inert glass biocomposites are considered in the temperature range between 1000 and 1300 degrees C. The results indicate that the best values of maximum compressive strength and microhardness are achieved in the samples sintered at 1200 degrees C for the glass in the weight of 5 and 10%. Moreover, above 1000 degrees C, decomposition of hydroxyapatite and new phase formations such as whitlockite and silicocarnotite play also a major role in the hardness and strength for goat hydroxyapatite/commercial inert glass biocomposites.
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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.