Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Yildiz Technical University, Faculty of Mechanical Engineering, Deparment of Mechanical Engineering, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: Özge BAYKO ŞAHİN
Supervisor: Bedri Onur Küçükyıldırım
Abstract:
Today, studies related to engine oil are aimed at reducing wear of engine with engine oil additive agents due to reasons such as protection of decreasing energy sources, damage caused by waste oils to the environment, reducing the costs made for the oil by extending the oil drain periods, lengthening the changing period of engine parts and lubrication being related to the fuel economy.
The usage of nanomaterials in tribology is increasing day by day thanks to their introduction into our lives. There are experimental studies related to carbon nanotube additive lubricants in the literature. These studies showed that functionalized carbon nanotubes with a homogeneous mixture with engine oil significantly reduce wearing. Thanks to these outstanding anti-wear properties of carbon nanotubes, it is expected to reduce wear on the piston ring by testing on the engine with their inclusion into the engine oil.
Nano lubricant was prepared and then firstly fully formulated oil engine tests and after that nano-lubricant engine tests were conducted within the scope of the thesis. The results of oil analysis were evaluated together with the oil samples obtained during the tests. After that the surface wear was examined by means of scanning electron microscope (SEM) method by disassembling of the piston rings of the engines which were used in the tests. Elements were evaluated by performing EDS analysis in the wear scar.
As a result of the thesis, when oil samples obtained from the tests conducted by
nano-lubricants and fully formulated oil were evaluated, it was concluded that the
nano-lubricant was within the safety limits at the end of the 250th hour. In the SEM
examination of the piston rings, it was found that operating with carbon nanotube
doped oil causes less wear when compared with the operating with fully formulated
oil. The wear problem is reduced thanks to the usage of carbon nanotube as an
additive agent. These developments improving the features of engine oil will be a
reference for us about long-lasting engines.