Browsing by Author "Taftali, M."

Now showing 1 - 3 of 3

Synthesis and Characterisation of Single and Duplex ZnO/TiO2 Ceramic Films on Additively Manufactured Bimetallic Material of 316L Stainless Steel and Ti6Al4V
(IOP Publishing Ltd, 2023) Yetim, T.; Tekdir, H.; Taftali, M.; Turalioglu, K.; Yetim, A. F.
Selective laser melting (SLM), one of the Laser Powder Bed Fusion (LPBF) additive manufacturing methods, has enabled the layered production of Ti6Al4V/316L layered samples, thanks to the layer-by-layer construction. Although 316L and Ti6Al4V are used in many engineering applications, their wear performance is limited. This study aims to improve the tribological and electrochemical properties of Ti6Al4V/316L layered samples. Thus, ZnO, TiO2 monolayer, composite, and ZnO/TiO2, TiO2/ZnO multilayer ceramic films on Ti6Al4V/316L layered surface sample, were coated via the sol-gel dip-coating process. The structural, morphological, and tribological properties of ZnO-TiO2 ceramic films were analyzed via x-ray diffractometer, Scanning Electron Microscopy (SEM), and 3D profilometer. The tribological properties of these coatings were examined using a reciprocating tribo-tester, and the electrochemical properties of samples were evaluated through potentiodynamic polarization and electrochemical impedance spectroscopy measurements. Structural and mechanical results indicated that ZnO and TiO2 films (monolayer, composite, and multilayer-coated) have higher surface roughness and hardness values than additively manufactured Ti6Al4V/316L layered models. Both single and multilayer ZnO and TiO2 ceramic-coated films improved the wear resistance of the Ti6Al4V/316L substrate. Also, The best tribological and corrosion resistance was acquired for the multilayer film (ZnO/TiO2) among all the coated models.
The Tribological and Corrosion Properties of Anodized Ti6Al4V/316L Bimetallic Structures Manufactured by Additive Manufacturing
(Elsevier Science Sa, 2021) Turalioglu, K.; Taftali, M.; Tekdir, H.; Comakli, O.; Yazici, M.; Yetim, T.; Yetim, A. F.
In this study, layered Ti6Al4V/316L substrates were formed by Laser Powder Bed Fusion. TiO2 ceramic layers were produced on the Ti6Al4V/316L structures by an anodic oxidation method at different coating times (15, 30, and 60 min) to advance the wear features of layered Ti6Al4V/316L structure. The surface characterizations, wear and electrochemical behaviors of all specimens were examined via scanning electron microscopy, X-ray diffraction, a microhardness device, a reciprocating tribo-tester, and electrochemical corrosion experiments. According to the outcomes, the wear and corrosion resistance of the anodic oxidized specimens were higher compared to untreated 316L and layered Ti6Al4V/316L substrates, and the best results were obtained from the anodized specimen treated for 60 min.
Tribological Behavior of Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings on 316l Stainless Steel Under High-Temperature Conditions
(Elsevier, 2023) Yetim, A. F.; Tekdir, H.; Turalioglu, K.; Taftali, M.; Yetim, T.
Yttria Stabilized Zirconia (YSZ) coatings by plasma spray coating were performed to investigate the behavior of 316L Stainless Steel (SS) under high temperatures. The structural and mechanical properties of YSZ films were examined by successful scanning electron microscopy and Vickers microhardness. A tribotester determined the friction and wear properties at 500 and 1000 degrees C temperature conditions. The results showed that the surface hardness values of the YSZ-coated samples were significantly improved due to obtained ceramic layer compared with untreated 316L samples. Although the abrasive wear mechanism was observed in both the coated and uncoated samples, it was observed that higher temperatures produced smoother wear tracks. Also, increased wear test temperatures resulted in micro cracks and structural degradations on the surface of untreated stainless steel samples.