Yazar "Daday, Mustafa" seçeneğine göre listele

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    Öğe
    Development and characterization of low temperature metallic glazes in Na2O-B2O3-SiO2 (NBS) system
    (Elsevier Sci Ltd, 2019) Mirdali, Nergis Kilinc; Daday, Mustafa; Daday, Mine Taykurt
    This paper presents the results of an investigation into crystal formation in NBS system for glaze with metallic appearance experimentally produced by embedding metallic substances as AgNO3, BaCl2, CuSO4 and CuCO3 and their characterizations. Composition of NBS was calculated by using Seger Method. According to the quantity of components, crystal phases were marked on Na2O-B2O3-SiO2 ternary diagrams. The amount of AgNO3 (2 wt%) was kept constant that other metallic substances (BaCl2, CuSO4 and CuCO3) were added in an amount of 5 wt% as had an impact on the mechanism of crystalline phase growth. These glaze compositions were applied over the surface of the commercial bodies and fired at 1040 degrees C, cooled to 750 degrees C and then reduced in the reductive atmosphere in order to obtain metallic layer on glaze surfaces for 20 min. These glaze layers characterized under mineralogical, microstructural and chemical points of view by means of X-Ray Diffraction (XRD), optical microscopy (OM), Scanning Electron Microscopy coupled with Energy Dispersive X-ray (SEM-EDX) and Ulltraviolet Visible Spectroscopy (UV-Vis) techniques. The results showed that silver and copper particles/crystals developed near/on the glaze surfaces creating multicolored metallic shine. Diffusion of metallic particles/crystals shown on the glazed layers as Ag and Cu followed by nucleation and growth in a reductive atmosphere.
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    Öğe
    Kil İçeriği Yüksek Aslantaş Baraj Gölü Çökelti Malzemesinin Seramik Üretiminde Kullanılabilirliğinin Araştırılması
    (2019) Mirdalı, Nergis Kılınç; Daday, Mustafa; Daday, Mine Taykurt
    Aslantaş Baraj Gölü, Karatepe-Aslantaş Milli Parkı ve Açık Hava Müzesi’ne komşu olan kıyılara sahipbir baraj gölüdür. Bu bölgenin tarihi değeri düşünüldüğünde, çökelen hammaddenin tanınması veseramiklerde kullanımının araştırılması önem arz etmektedir. Çökelti malzemesinin tane boyutu vedağılımı, lazer parçacık boyutu ve dağılımı ölçme cihazı ile ölçülmüştür. Hammaddenin kimyasal vemineralojik analizi X-ışını floresans (XRF) ve X-ışını kırınımı (XRD) metodu ile yapılmıştır. Numuneninısıl davranışı termogravimetrik/diferansiyel taramalı analiz cihazı (TGA/DTA) ve optik dilatometre(ODHTM) ile tespit edilmiştir. Bünye numuneleri yarı-yaş yöntemle (plastik şekillendirme) hazırlanmış,astarlar renklendirilerek farklı kompozisyonlardaki seramik çamurlarından üretilen bünyeler üzerineuygulanmıştır. Numuneler 800, 900, 1000, 1100 ve 1200 oC’de fırınlanmış ve tüm bünyelerin boyutsalküçülme değerleri ölçülmüştür. Pişirimin ardından renk değerleri CIE-L*a*b* yöntemiyle tespitedilmiştir. Alınan sonuçların ışığında, hammaddenin, seramik astar ve bünye olarak kullanılabileceğifakat içerisindeki kalsiyum karbonat miktarının yüksekliği nedeniyle ince bir katman olarak uygulananastarlarda daha iyi sonuçlar elde edileceği saptanmıştır.
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    Öğe
    The effect of fluxing agents and heat treatment on the leucite crystallization in bio glass–ceramic composites
    (Springer, 2023) Güngör, Fazilet; Taykurt Daday, Mine; Karasu, Bekir; Altun, Berda; Daday, Mustafa
    The main purpose of the present study is to produce leucite-based bio glass–ceramic composite considering the results from the previous studies; however, nucleating oxides are excluded from the production process. The effects of fluxing agents and heat treatment on leucite crystallization in bio glass–ceramic composites are in the center of investigation. At the beginning, a series of laboratory experiments were conducted using the relevant data specified in the literature, then, three different compositions were chosen considering their high leucite content. In these three compositions, the amounts of K2O, Al2O3, and SiO2 were fixed and the amounts of the Na2O, Li2O, CaO, and B2O3 were changed. The batches were glassified and then quenched into water. The produced frits were ground under 63 microns, dried, and shaped. By evaluating the critical temperatures (Tg and Tc/Tp) of DTA, two heat-treatment stages were defined and samples were exposed to cycles. During characterization studies, all samples from two cycles contained leucite as the main phase accompanied by a glassy phase. When the heat-treatment temperature was higher and the period became longer, the amount of leucite phase increased. CTE values were changed with the content of leucite crystal in the glass–ceramic system, as expected. The viscosity curves as functions of temperature were drawn from the compositions using the Lakatos and Fluegel empirical model and correlated with the crystallization behavior. The well-crystallized leucite glass–ceramic structure (42% leucite) was obtained by the recipe LC02, without any addition of nucleating oxides, (after HT02 cycle), with a value of ? is 14.14 10?6/°C. © 2022, The Author(s) under exclusive licence to Australian Ceramic Society.