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  • Küçük Resim
    Öğe
    AZ91 magnezyum alaşımının sol-jel yöntemiyle hidroksiapatit kaplanması
    (2017) Albayrak, Sevda; Çinici, Hanifi; Çalın, Recep; Cömert, Canser
    Bu çalışmada amaç; biyomedikal uygulamalarda kullanılmak üzere mevcut biyomalzemelerden daha hafif, biyolojik saldırılara karşı dirençli ve kemik yapısına benzer, doku ile uyumlu bir malzeme üretebilmektir. Hafiflik biyomalzeme uygulamalarında son derece önemlidir, çünkü paslanmaz çelik ve bunun gibi ağır metalik alaşımlar vücutta kullanıldığında implant çevresindeki dokulara zarar vererek enfeksiyona sebep olabilmektedir. AZ91 Mg alaşımının hafifliği büyük bir avantaj olsa da vücutta kullanmak için yeterli mukavemete sahip değildir ve biyolojik ortamda bozunmaktadır. AZ91 Mg alaşım tozları 320 °C sıcaklık ve 275 MPa basınçta sıcak pres yöntemi ile preslendikten sonra, yeterli dayanımı sağlamak ve bozunmasını engellemek amacıyla sol-jel ve dip coating metoduyla yüzeyi farklı daldırma sayılarında hidroksiapatit ile kaplanmış ve 400 °C'de sinterlenmiştir. Kaplanan numunelerin yüzey morfolojileri SEM; faz yapıları ise XRD ile incelenmiştir
  • Küçük Resim
    Öğe
    Hydroxyapatite coating on AZ91 magnesium alloy via sol-gel method
    (Pamukkale Univ, 2017) Albayrak, Sevda; Cinici, Hanifi; Çalın, Recep; Comert, Canser
    Producing a material lighter than available biomaterials, having corrosion-resistance to biological attacks and histocompatible similar to the bone structure in order to use in biomedical applications is the purpose of this study. Lightness is extremely important in biomedical applications because stainless steel and many of the similar heavy metallic alloys can lead to infection by causing harm to tissues around the implant when it is used in the body. Although the lightness of AZ91 Mg alloy is an advantage, it is not strength enough to use in human body and it degrades in biological environment After AZ91 Mg alloy powders were pressed with unidirectional hot pressing machine under 275 MPa pressure and 320 degrees C temperature, their surfaces were coated with hydroxyapatite to provide sufficient strength and prevent the degradation of specimens using sol-gel and dip coating method with different dipping number. Then the specimens were sintered at the temperature of 400 degrees C. The surface morphologies and phase structures of coated specimens were analyzed with SEM and XRD, respectively.
  • [ X ]
    Öğe
    Tantalum-Oxide Coating and Characterization of WE43 Magnesium Alloys by RF Sputtering Method
    (Kırıkkale Üniversitesi, 2021) Gül, Canser; Albayrak, Sevda; Çinici, Hanifi
    Magnesium alloys are frequently used in the automotive and aerospace industries due to their high specific strength. Various studies are carried out to increase the wear and corrosion resistance of alloys. The study includes the coating and characterization of WE43 magnesium alloys, with tantalum-oxide. Tantalum-oxide coatings were applied to WE43 magnesium alloy by RF sputtering method. In order to observe the effect of acid etching applied to the surfaces before the coating process, H2SO4 and HCl acid mixtures were used and the samples were subjected to acid etching after polishing at 25, 45, 65 and 85 °C, with in contact with the acid. The effects of the applied acid etching processes on the coated surfaces were investigated within the study. The effects of the applied processes on surface morphology before coating, the metallurgical bond formed between the surface and coating layer and the surface properties after coating were investigated by scanning electron microscopy, energy distribution spectroscopy, X-ray scanning and coating thickness measurements taken from the cross section. As a result, it was determined there were differences in the surfaces before the coating, cracked and worn areas were observed, and nevertheless, crack-free/non-porous, continuous and homogeneous coating layers were obtained on the surfaces. The applied surface treatments caused changes in the surface chemistry and morphology. Coating thicknesses were obtained as 2.52±0.02 µm.