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Träfflista för sökning "WFRF:(Efeoğlu İhsan) "

Sökning: WFRF:(Efeoğlu İhsan)

  • Resultat 1-6 av 6
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1.
  • Bara, Özlem, et al. (författare)
  • Adhesion and tribological properties of TiTaBN coatings with a graded interlayer deposited by pulsed DC biased and continuous dc biased magnetron sputtering
  • 2015
  • Ingår i: Journal of Adhesion Science and Technology. - : Informa UK Limited. - 0169-4243 .- 1568-5616. ; 29:18, s. 2006-2019
  • Tidskriftsartikel (refereegranskat)abstract
    • The properties of TiBN-based coatings are significantly affected by adding alloying elements and coating parameters. Therefore, in this study, TiTaBN coatings with graded interlayer (CWGIL) were deposited on D2 steel substrates by pulsed DC biased (PDCB) and continuously DC biased (CDCB) closed field unbalanced magnetron sputtering (CFUBMS). The structural, mechanical, adhesion and tribological properties of the coatings were analysed with EDS, SEM, XRD, microhardness, scratch testing and a pin-on-disc tribo-tester (under various atmospheric conditions). TiTaBN CWGIL deposited by PDCB magnetron sputtering (MS) had a very dense microstructure, high hardness and a high critical load value. TiTaBN CWGIL deposited by PDCB MS had a lower friction coefficient, the wear rate and the penetration depth in all atmospheric conditions. In conclusion, the application of a PDCB substrate instead of a CDCB one dramatically increases the performance of CFUBMS-deposited TiTaBN coatings.
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2.
  • Efeoglu, Ihsan, et al. (författare)
  • Interfacial scratch adhesion behavior of multilayered Ti(BN):Ti(MoS2) based PVD coatings
  • 2009
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Interfacial adhesion is critical property of multilayered thin films used in micro-electromechanical systems, ceramic capacitors, wear resistant coatings. In the present investigation, Ti(BN)+Ti(MoS2) solid multilayered composite solid lubricant coatings were deposited by magnetron sputtering from separate Ti, TiB2, and MoS2 target. X-ray diffraction, microhardness tester, and scratch tester were used to evaluate structural, mechanical and interfacial adhesion properties. In the work, described here changes in the adhesion of intercoat exhibited by nine different coatings deposited under variants of deposition parameters have been investigated. It is found that the crack propagates alternatively between the two interfaces with thinning of the interlayer.
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3.
  • Gebretsadik, Daniel, et al. (författare)
  • Tribological properties of composite multilayer coating
  • 2010
  • Ingår i: 14th Nordic Symposium on Tribology. - Luleå : Luleå tekniska universitet. - 9789174391244
  • Konferensbidrag (refereegranskat)abstract
    • The use of surface coatings is emerging as one of the most important approaches in reducing friction and wear in various tribological applications. Even though single layer coatings have a wide range of applications, the performance of the single layer alone may not always be adequate to meet the desired tribological property requirements. Hence, coatings consisting of multi-layers to meet different property requirements in demanding applications are required. In this study, the tribological properties of a graded composite multilayer coating with a specific layer sequence of MoS2:Ti/MoS2:TiBN/TiBN/TiB2/Ti deposited on tool steel substrate have been investigated at temperatures of 40°C and 400°C respectively. The experimental results from the tests at 40°C have shown that the friction coefficient value rangesbetween 0.02 and 0.034. It was found that the deposition parameters influenced the friction and durability of the coatings. Higher substrate bias was found to result in higher friction and the coating deposited at high substrate bias and low N2 flow showed the lowest durability. The friction coefficient and durability of the coatings were found to be highly dependent on temperature. At high temperature, the friction coefficient increases almost three fold and the durability decreases significantly.
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4.
  • Gebretsadik, Daniel, et al. (författare)
  • Tribological properties of composite multilayer coating
  • 2011
  • Ingår i: Tribology - Materials, Surfaces & Interfaces. - 1751-5831 .- 1751-584X. ; 5:3, s. 100-106
  • Tidskriftsartikel (refereegranskat)abstract
    • The use of surface coatings is emerging as one of the most important approaches in reducing friction and wear in various tribological applications. Even though single layer coatings have a wide range of applications, the performance of the single layer alone may not always be adequate to meet the desired tribological property requirements. Hence, coatings consisting of multilayers to meet different property requirements in demanding applications are required. In this study, the tribological properties of a graded composite multilayer coating, with a specific layer sequence of MoS2/Ti‐MoS2/TiBN‐TiBN‐TiB2‐Ti deposited on tool steel substrate, have been investigated at temperatures of 40 and 400°C respectively. The experimental results from the tests at 40°C have shown that the friction coefficient value ranges between 0�02 and 0�034. It was found that the deposition parameters influenced the friction and durability of the coatings. Higher substrate bias was found to result in higher friction, and the coating deposited at high substrate bias and low N2 flow showed the lowest durability. The friction coefficient and durability of the coatings were found to be highly dependent on temperature. At high temperature, the friction coefficient increases almost threefold, and the durability decreases significantly.
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5.
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6.
  • Hardell, Jens, et al. (författare)
  • Tribological degradation of MoS2-Ti sputtered coating when exposed to elevated temperatures
  • 2010
  • Ingår i: Tribology - Materials, Surfaces & Interfaces. - 1751-5831 .- 1751-584X. ; 4:3, s. 121-129
  • Tidskriftsartikel (refereegranskat)abstract
    • The use of solid lubricants is an effective way to control friction and wear in applications where traditional lubricants such as oils and greases cannot be used. MoS2 is a popular solid lubricant which has been widely used in many applications, especially space applications in view of its good performance in vacuum. Recent developments in physical vapour deposition technology have led to the development of sputtered MoS2 films doped with different metals to improve their durability and reduce the detrimental effects of oxidation and humidity on their tribological performance. In this work, a MoS2-Ti coating deposited on a hot forming tool steel substrate has been studied at ambient and elevated temperatures. The objective was to investigate how the friction and durability of the MoS2-Ti coating are affected after exposure to elevated temperatures. The results have shown that low friction values of ∼0·02 were obtained at room temperature and low relative humidity of 25%. An increase in relative humidity to 40% led to an increase in friction by almost 100%. There was a very significant degradation in frictional characteristics as well as durability after the MoS2-Ti coating was exposed to 400°C. The wear of the counter surface also increased when sliding against the MoS2-Ti coating exposed to elevated temperatures. This has been attributed to interaction of the counterbody with hard abrasive molybdenum oxides formed on the MoS2-Ti coating due to exposure to elevated temperatures.
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  • Resultat 1-6 av 6
Typ av publikation
konferensbidrag (3)
tidskriftsartikel (3)
Typ av innehåll
refereegranskat (4)
övrigt vetenskapligt/konstnärligt (2)
Författare/redaktör
Hardell, Jens (6)
Prakash, Braham (6)
Efeoğlu, İhsan (6)
Gebretsadik, Daniel (2)
Bara, Özlem (1)
Lärosäte
Luleå tekniska universitet (6)
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Engelska (5)
Svenska (1)
Forskningsämne (UKÄ/SCB)
Teknik (6)

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