Araştırmacılar(5)

• Acar, M.T.
• Acımert, Özlem Baran
• Albayrak, Çigdem
• Aslan Çakir, Mevra
• Kara, Levent

• ArticleAçık Erişim2025/r/ebyu/19479
  Tribological Properties of Films Coated on CP-Titanium and CoCrMo Alloy by Cathodic Arc Deposition Method

  Çakır, Mevra Aslan; Demirbüken, Ömer

  The improvement of tribological properties of biomaterials in load-bearing implants is very important. In this study, the tribological properties of TiN and ZrN films deposited on surfaces by CA-PVD method on two different types of biomaterials (CP-Ti and CoCrMo alloy) were compared under dry wear conditions and 1N and 3 N loads. In addition, the microstructural and mechanical properties of TiN and ZrN films deposited on the surface on CP-Ti and CoCrMo materials were investigated. The crystal structure, elemental composition and surface morphology of TiN and ZrN coated CP-Ti and CoCrMo materials were determined using XRD, SEM and SEM-EDS analyses, respectively. According to the test results conducted in a dry environment after the wear test under 1N load, the lowest friction coefficient was found in the untreated CoCrMo sample at approximately 0.35, while the highest friction coefficient was found in the ZrN-coated CoCrMo sample at 0.55. While the lowest wear rate under 3N load was 0.38x10-6 mm3/Nm in the ZrN/CCM sample, the highest wear rate was 2.10x10-6 mm3/Nm in the untreated Ti sample. As a result, it was determined that the microhardness values and wear resistance of the TiN and ZrN-coated CP-Ti and CoCrMo samples increased.

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• ArticleAçık Erişim2024/r/ebyu/19754
  Microstructural and Tribological Properties of ZrO2 Film Grown by DC Magnetron Sputtering Technique

  Çakır, Mevra Aslan

  To improve the mechanical and tribological properties of biomedical materials, biocompatible coatings are obtained on surfaces using various methods. In this study, ZrO2 thin films were deposited on CP-Ti material used as biomaterial by DC magnetron sputtering method. In this context, structural, mechanical, tribological and wettability properties of ZrO2 film coated on CP-Ti base material were investigated. X-ray diffraction method (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to characterize the crystallographic structure and surface morphology of the obtained film. Microhardness and wear tests were carried out to investigate the mechanical and tribological properties of the coatings. Additionally, contact angle measurements were made with pure water and ethylene glycol to determine the hydrophobicity and oleophobicity properties of the ZrO2 coated samples. The water contact angle and the oil contact angle of the film are 105.4° and 73.2, respectively. The results showed that ZrO2 coating film deposited on surfaces by DC magnetron sputtering method was more resistant to wear compared to bare CP-Ti.

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• ArticleAçık Erişim2023/r/ebyu/20169
  Determination of electrochemical and wettability properties of TiN coated 316L stainless steel implant material by cathodic arc PVD method

  Çakır, Mevra Aslan

  In this study, TiN films were coated on the surface by cathodic arc physical vapor deposition (CAPVD) method in order to improve the corrosion resistance and hydrophobic properties of 316L stainless steel, which is used as a biomaterial. The surface morphology, surface composition, corrosion resistance, and wettability of the coated samples were characterized and the characterization of the coatings was done by XRD, SEM and EDS. After electrochemical experiments in simulated body fluid ( SBF) solution, it was observed that the corrosion resistance of the coating film increased. In addition, contact angle measurements were taken with distilled water, n-hexadecane, ethylene glycol, and SBF solutions to determine the wettability and free surface energy properties of untreated and coated samples. The hydrophobic and oleophobic properties of the surfaces were obtained after the coating film, and the contact angle value increased from 92° to 119° after the contact angle measurement with the SBF solution. According to the measured contact angle values, the surface free energy values of the untreated and TiN coated stainless steel samples were calculated as 26.7 mN/m and 18.5 mN/m, respectively, according to the measured contact angle values.

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• ArticleYalnız künye2019/r/ebyu/22268
  CrN Kaplanmış AISI 52100 Çeliğinin Atmosfer ve Vakum ortamlarında Aşınma Davranışının İncelenmesi

  Kara, Levent

  Bu çalışmada farklı taban malzeme bias gerilimleri uygulanarak üretilen CrN kaplamalarının morfolojik, yapısal,kimyasal ve aşınma dayanımı özellikleri incelenmiştir. Sanayide yaygın bir şekilde kullanılan AISI 52100 çeliğitaban malzeme olarak seçilmiştir. Kaplama yöntemi olarak fiziksel buhar biriktirme yöntemi kullanılmıştır.Kaplamaların morfolojik özellikleri taramalı elektron mikroskobu kullanılarak incelenmiştir. Kaplamalarınkristolografik yapıları X ışını difraksiyonu yöntemi kullanılarak analiz edilmiştir. Kaplamaların kimyasalbileşenleri EDS analizi ile incelenmiştir. Kaplamaların aşınma dayanımı özellikleri 5x10-3 mbar vakum ve normalatmosfer ortamlarında sabit hız, süre ve yük deney parametrelerinde disk üzeri bilye deney düzeneği kullanılarakincelenmiştir. Aşınma hacimleri temassız optik profilometre ile ölçülmüştür. Aşınma mekanizmaları aşınmaizlerinden alınan SEM ve EDS analizleri ile karakterize edilmiştir. Bu çalışmada kullanılan kaplamaparametreleriyle elde edilen CrN kaplamaların aşınma dayanımlarını belirlemek için yapılan deneylerden eldeedilen sonuçlara göre; atmosfer şartlarında CrN kaplanmış bütün numunelerin, kaplanmamış numunelere göredaha düşük aşınma miktarına sahip olduğu gözlenmiştir. Atmosfer koşullarında en düşük aşınma miktarı, tabanmalzemelere 200 Volt bias uygulanan numunelerden elde edilirken, vakum ortamında en düşük aşınma miktarıtaban malzemelere 100 Volt bias gerilimi uygulanan numunelerden elde edilmiştir. Atmosfer ortamında aşınmamekanizması bütün numunelerde oksidatif ve abrazif olarak gözlemlenirken, vakum ortamında aşınmamekanizması adhezif olarak gözlenmiştir.

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• ArticleYalnız künye2017/r/ebyu/20988
  Investigation of Mechanical and Tribological Properties of TiNbN and TiVN Films Deposited by Magnetron Sputtering Method

  Baran, Özlem

  Nickel alloys, especially Inconel, show good mechanical properties in a wide temperature range. But, the wear resistance of this alloys are fairly low. Due to high hardness, low friction coefficient and good wear resistance, transition metal nitride films are commonly used in industry. In this study; for the purpose of increasing the wear resistance of Inconel 600 substrate, TiNbN and TiVN films were coated on these substrates using Closed Field Unbalanced Magnetron Sputtering method. The structural properties of the films were analyzed using XRD, SEM and EDS, the mechanical properties were determined by nanohardness and scratch tests. Thefriction and wear properties were determined using the wear test method. The TiNbN and TiVN films exhibit a dense and columnar microstructure. According to XRD analyze results; TiVN (111) and TiNbN (111) were dominant phases for the TiVN and TiNbN films, respectively. Compared with the TiVN films, due to the higher film thickness and %N content, the dominant (111) orientation and the smaller grain size, the TiNbN films exhibited the higher hardness and better adhesion. The TiVN and TiNbN films considerably increased the wear resistance of Inconel 600 substrate. When compared with the TiVN films, the TiNbN films with the higher hardness and better adhesion significantly improved the tribological properties of the substrate with lower friction coefficient and lower wear rate.

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