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ÇETİNER, BURCU NİLGÜN

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ÇETİNER

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BURCU NİLGÜN

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2015 - 20172
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Author: ERKMEN, ZİYA ENGİN ×

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    Production and Characterization of Alumina-Titania Biocomposite
    (AMER INST PHYSICS, 2015) ÇETİNER, BURCU NİLGÜN; Cetiner, B. N.; Erkmen, Z. E.; Oral, AY; Bahsi, ZB; Ozer, M; Sezer, M; Akoz, ME
    Alumina is a biomaterial of choice for more than 20 years due to its high hardness accompanied by low friction, wear and inertness to in vivo environment. It has been reported that titanium oxidized to the rutile phase is bioactive. This is a property discovered for certain ceramics such as Bioglass and sintered hydroxylapatite (HA). But the combination of alumina and titania forming tialite (Aluminium titanate-50 mol % Al2O3 and 50 mol % TiO2) is a new challenge. In this work we made firstly the beneficiation of the Seydisehir alumina by leaching it in the acidic solution the Aqua Regia followed by preparation of batches containing 2,5 wt %, 3,5 wt % and 4,5 wt % of MgO as the sintering aid, 1 wt % of SiO2 and the balance; the alumina and titania powder mixture (1:1 mole). After sintering these batches at 1600 degrees C for about 12 h, their mechanical properties (the compression and hardness testings) and phase ratios (the XRD analysis) were analyzed and compared with the control group containing the laboratory scale alumina instead of the Seydisehir alumina. Following the characterization (the SEM and the EDS analysis) of the substrate material, the comparison of two different materials was carried out.
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    INVESTIGATION OF INDENTATION FRACTURE TOUGHNESS (K-IC) AND WEIBULL PARAMETERS OF 0.25Li(2)O.2SiO(2)-0.75BaO.2SiO(2) GLASS-CERAMIC
    (POLSKA AKAD NAUK, POLISH ACAD SCIENCES, INST METALL & MATER SCI PAS, 2017-12-01) ÇETİNER, BURCU NİLGÜN; Ertug, B.; Cetiner, B. Nilgun; Gokce, H.; Erkmen, Z. Engin; Ovecoglu, M. Lutfi
    In the present study, mechanical properties of 0.25Li(2)O.2SiO(2)-0.75BaO.2SiO(2) glass-ceramic were investigated. The transformations temperatures were determined by DTA instrument. The optimum nucleation temperature was found to be 540 degrees C. This suggested the crystallization temperatures as 675, 720 and 800 degrees C. After carrying out crystallization heat treatments, Vickers indentation test was applied. In order to determine the indentation fracture toughness (KIC), crack half-length, 'c' of the samples was measured. To calculate KIC, Young's modulus, E and the measured hardness, Hv were used. Using KIC and probability of fracture, 'P', ln ln[1/(1-P)]-ln KIC graph was drawn based on the Weibull distribution equation. Consequently, Weibull modulus,, m` and scale parameter, 'K-0' were determined and compared with each other.