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- MakaleYalnız künye2024Scopus SJRQ3Tribological properties of the multilayer thin films deposited on the free-form shaped Ti13Nb13Zr alloy
Aslan, Ali Kemal; Bahçe, Erkan
Surface coating processes are carried out to increase the wear and corrosion resistance of products with free-form surfaces used in the biomedical field. In this study, Ti/TiN/TiC/TiCN/TaN multilayer thin films were deposited on the surface of Ti13Nb13Zr alloy samples with different radii of curvature using the closed-field unbalanced magnetron sputtering technique. The wear and adhesion properties of thin films were examined with a specially developed wear test setup, in a simulated body fluid environment and an ultra-high molecular weight polyethylene (UHMWPE) counterpart was used. Scanning electron microscope and X-ray diffraction measurements were used to study the morphology and microstructure of the thin films before and after wear experiments. The delamination amounts of the coatings on the sample surfaces after the wear test were measured and this value was calculated as 8.73%, 12.16%, and 16.89% for the R14, R18, and R22 samples, respectively. As a result of these findings, it was determined that the wear resistance of the coatings decreased as the radius of the curvature increased. The wear amounts of the UHMWPE components are found as 15.45, 6.75, 8.15, 15.45, 6.75, and 8.15 mg for P0, P14, P18, and P22 samples, respectively.
- MakaleAçık Erişim2019Scopus SJRQ1Al-doped ZnO as a multifunctional nanomaterial: Structural, morphological, optical and low-temperature gas sensing properties
Aydın, Handan; Yakuphanoglu, Fahrettin; Aydın, Cihat
In this study, zinc oxide thin films doped with Al at different atomic ratios (0.1%, 0.5%, 1%, 2%, 5%) were prepared using sol-gel spin coating method. Crystal structure, surface morphology, optical properties of the films and their response to ammonia gas were examined. XRD results showed that the ZnO thin films had a hexagonal polycrystalline structure. It was concluded from the calculation of the crystal size and lattice constant of the films that the produced samples were a nanomaterial. Scanning electron microscope (SEM) and atomic force microscope (AFM) images of the samples revealed that the morphology was composed of nanostructured particles and a cluster structure made of the combination of these particles. The optical band gap (Eg) of the prepared films were found within the range of 3.251 eV–3.342 eV by using the optical absorption method. Characteristics of susceptibility against ammonia gas were evaluated depending on the Al dopant. The obtained results showed that the gas response along with the structural, morphological, and optical properties of ZnO thin films changed with Al dopant. The produced thin film samples can be used as a sensor for the detection of ammonia gas in various industrial branches.
AtıfScopus66WoS59OpenAlex76
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