Dileknur Evrensel - Academia.edu (original) (raw)

Papers by Dileknur Evrensel

Erzincan University Journal of Science and Technology, Mar 27, 2022

In internal combustion engines (ICE), the friction of parts working in contact affects both engin... more In internal combustion engines (ICE), the friction of parts working in contact affects both engine life and fuel consumption. Piston rings cause a significant portion of friction losses in an ICE. The most effective method to reduce these losses is the surface coating process. The PVD technique draws attention both because it does not pose a problem for the environment and because it enables the coating of complex geometric parts. In this article, the tribological and mechanical properties (microhardness) of TiAlCN ceramic coating and uncoated piston ring coated on the surface of the cast iron piston ring by the cathodic arc PVD technique were investigated. The structural properties of the coated and uncoated samples were investigated by SEM, EDX and the coatings must have XRD methods. As a result of the tribological test, the average friction coefficients of the uncoated and TiAlCN coating under dry conditions were determined as 0.76 and 0.21, respectively. As a result of the reciprocating slip test, the wear rate of the TiAlCN coating was reduced by approximately 97% compared to the uncoated ring. The results showed that the TiAlCN coating exhibited good tribological properties. Besides, wear mechanisms were examined based on the SEM image and EDX analysis taken from the worn surface of the samples.

Industrial & Engineering Chemistry Research, 2014

Layered sodium silicates β-Na 2 Si 2 O 5 and kanemite were synthesized via facile methods under m... more Layered sodium silicates β-Na 2 Si 2 O 5 and kanemite were synthesized via facile methods under mild conditions. The tribological properties of β-Na 2 Si 2 O 5 and kanemite utilized as additives in lithium grease were evaluated with a four-ball tester under different experimental conditions. The maximum nonseizure load value of 5.0 wt % β-Na 2 Si 2 O 5 grease jumped from 353 N (the base grease) to 1568 N. However, 5.0 wt % MoS 2 grease could only reach 617 N under the same conditions. The SEM and EDS results confirm that a protective film mainly composed of sodium silicates was formed on the worn surface during the friction process. The structural stability of β-Na 2 Si 2 O 5 and kanemite after the wear test was studied by XRD. It was found that a loss of interlamellar water causes the layer structure of kanemite to collapse during a long-duration wear test. The layered structure of β-Na 2 Si 2 O 5 is stable, and its tribological properties are better than those of kanemite.

Journal of Materials Engineering and Performance, 2021

Friction among different engine components in internal combustion engines affects the life and co... more Friction among different engine components in internal combustion engines affects the life and combustion performance of the engine. Today, different surface coatings are made to reduce these effects. The physical vapor deposition (PVD) method has attracted the most attention because it is environmentally friendly and homogeneous coatings can be obtained. In this paper, tribological and mechanical properties of the monolayer TiAlN (titanium aluminum nitride) and multilayer TiN/TiAlN ceramic coatings applied to the piston rings made of cast iron with PVD method have been reported. In addition, the tribological behavior of the multilayer TiAlN coating was investigated for lubrication and dry conditions. The coating types, wear morphologies, chemical composition and phases on the coating surface were analyzed by SEM, EDS and XRD techniques. As a result of the tribological test, the coefficients of friction of mono- and multilayer TiAlN coatings under dry conditions were determined as 0.60 and 0.45 for 250 m, respectively. According to the result of the tribological test under lubricated environment conditions performed using the same parameters, it was determined that the friction of the multilayer TiAlN coating decreased by 85% ( µ = 0.088). As a result, the multilayer TiAlN coated ring showed the best abrasion resistance. The reciprocating sliding test result showed that the wear rate of the multilayer TiAlN coating has been reduced by 95% compared to the uncoated ring. Considering all the experimental findings, it has been proven that as the number of layers in the coating increases, the surface roughness, hardness and wear properties improve. Furthermore, the wear mechanism was suggested to coated specimens based on the SEM image taken from the worn surface of the sample and EDX analysis.

Erzincan University Journal of Science and Technology, Mar 27, 2022

In internal combustion engines (ICE), the friction of parts working in contact affects both engin... more In internal combustion engines (ICE), the friction of parts working in contact affects both engine life and fuel consumption. Piston rings cause a significant portion of friction losses in an ICE. The most effective method to reduce these losses is the surface coating process. The PVD technique draws attention both because it does not pose a problem for the environment and because it enables the coating of complex geometric parts. In this article, the tribological and mechanical properties (microhardness) of TiAlCN ceramic coating and uncoated piston ring coated on the surface of the cast iron piston ring by the cathodic arc PVD technique were investigated. The structural properties of the coated and uncoated samples were investigated by SEM, EDX and the coatings must have XRD methods. As a result of the tribological test, the average friction coefficients of the uncoated and TiAlCN coating under dry conditions were determined as 0.76 and 0.21, respectively. As a result of the reciprocating slip test, the wear rate of the TiAlCN coating was reduced by approximately 97% compared to the uncoated ring. The results showed that the TiAlCN coating exhibited good tribological properties. Besides, wear mechanisms were examined based on the SEM image and EDX analysis taken from the worn surface of the samples.

Industrial & Engineering Chemistry Research, 2014

Layered sodium silicates β-Na 2 Si 2 O 5 and kanemite were synthesized via facile methods under m... more Layered sodium silicates β-Na 2 Si 2 O 5 and kanemite were synthesized via facile methods under mild conditions. The tribological properties of β-Na 2 Si 2 O 5 and kanemite utilized as additives in lithium grease were evaluated with a four-ball tester under different experimental conditions. The maximum nonseizure load value of 5.0 wt % β-Na 2 Si 2 O 5 grease jumped from 353 N (the base grease) to 1568 N. However, 5.0 wt % MoS 2 grease could only reach 617 N under the same conditions. The SEM and EDS results confirm that a protective film mainly composed of sodium silicates was formed on the worn surface during the friction process. The structural stability of β-Na 2 Si 2 O 5 and kanemite after the wear test was studied by XRD. It was found that a loss of interlamellar water causes the layer structure of kanemite to collapse during a long-duration wear test. The layered structure of β-Na 2 Si 2 O 5 is stable, and its tribological properties are better than those of kanemite.

Journal of Materials Engineering and Performance, 2021

Friction among different engine components in internal combustion engines affects the life and co... more Friction among different engine components in internal combustion engines affects the life and combustion performance of the engine. Today, different surface coatings are made to reduce these effects. The physical vapor deposition (PVD) method has attracted the most attention because it is environmentally friendly and homogeneous coatings can be obtained. In this paper, tribological and mechanical properties of the monolayer TiAlN (titanium aluminum nitride) and multilayer TiN/TiAlN ceramic coatings applied to the piston rings made of cast iron with PVD method have been reported. In addition, the tribological behavior of the multilayer TiAlN coating was investigated for lubrication and dry conditions. The coating types, wear morphologies, chemical composition and phases on the coating surface were analyzed by SEM, EDS and XRD techniques. As a result of the tribological test, the coefficients of friction of mono- and multilayer TiAlN coatings under dry conditions were determined as 0.60 and 0.45 for 250 m, respectively. According to the result of the tribological test under lubricated environment conditions performed using the same parameters, it was determined that the friction of the multilayer TiAlN coating decreased by 85% ( µ = 0.088). As a result, the multilayer TiAlN coated ring showed the best abrasion resistance. The reciprocating sliding test result showed that the wear rate of the multilayer TiAlN coating has been reduced by 95% compared to the uncoated ring. Considering all the experimental findings, it has been proven that as the number of layers in the coating increases, the surface roughness, hardness and wear properties improve. Furthermore, the wear mechanism was suggested to coated specimens based on the SEM image taken from the worn surface of the sample and EDX analysis.