Investigation of tribological properties of graphene nanoplatelets reinforced metal matrix nanocomposites için kapak resmi
Investigation of tribological properties of graphene nanoplatelets reinforced metal matrix nanocomposites
Martin, Seçkin, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
x, 53 leaves: color illustrarions, charts;+ 1 computer laser optical disc
In this research, graphene nanoplatelets (GNPs) with a thickness of 50-100 nm have been utilized to improve the mechanical and tribological properties of A360 alloy due to their extraordinary mechanical properties and solid lubricant nature. During the fabrication process, GNPs were introduced into the liquid Aluminum (Al), then mechanical stirrer and ultrasonic treatment were used to obtain homogeneous dispersion of GNPs throughout the matrix. The examination of microstructures showed that A360/0.25 wt.% GNP nanocomposites have a relatively uniform distribution of GNPs. During the tribological properties investigation, ball-on disk tests were carried out at various temperature including room temperature (RT), 150°C, and 300°C. According to the hardness and ball-on-disk test results, the nanocomposite specimens exhibited improved hardness and wear resistance. The main mechanism of improvement in the hardness performance is mainly attributed the grain refinement by GNPs since they acted as the nucleation agents during the solidification process. The improvement in the wear behavior of nanocomposites could be referred to the temporarily formed solid lubricant film of harder GNPs during the wear, and hence coefficient of friction (COF) and volume loss results considerably reduced. Abrasive-adhesive, oxidation, and melting wear mechanism were found to be main mechanisms at RT, 150°C, and 300°C respectively. Overall, the results show that the nanocomposites fabricated by casting method combined with mechanical stirring and ultrasonication have promising wear performance, especially at elevated temperatures. This may suggest that these developed materials could be good candidates to be used in the engineering applications requiring high temperature wear performance.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Master)--İzmir Institute of Technology: Mechanical Engineering.

İzmir Institute of Technology: Mechanical Engineering--Thesis (Master).
Elektronik Erişim:
Access to Electronic Versiyon.


Materyal Türü
Demirbaş Numarası
Yer Numarası
Durumu/İade Tarihi
Tez T002032 TJ1075 .M375 2019

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