A Systematic Study on Composition of Low Viscosity Automotive Lube Oils with an Emphasis on Wear and Frictional Characteristics

摘要

In this work the performance of three commercial lube oils and two base oils of different viscosities, composition have been studied for their tribo performance using four ball tribo tester as per ASTM D 4172D and IP 239 and at the end of the test run the steel ball surfaces have been examined under scanning electron microscope (SEM) to assess the wear deformities. The tribo-performance results have been co-related with the physico-chemical properties along with quantity and type of the molecules present in these oils by proton nuclear magnetic resonance (NMR) studies. It has been observed that the lubricant with higher viscosity, higher aromatic molecules containing CH_? chains shows lower friction and wear behavior whereas the increasing napthenic type molecules have reverse effect which is evident from the results.