This paper reports the influence of PAO 5W30 synthetic oil in contact with DLC films. These films were deposited on 316L stainless steel substrates using PECVD technique. The addition of synthetic oil has been proposed as the controlling mechanism that can lead to super low friction coefficients and wear. Tribological behavior under hybrid lubrication was investigated. The results clearly show that when synthetic oil was added to DLC/DLC pair, the friction coefficient did not change compared to DLC/DLC pair in air conditions. However, for 316L/DLC par, the friction coefficient decreased 75% compared to 316L/DLC par in air conditions. The wear rate of DLC/DLC did not change, when the 5W30 oil was added, the wear rate of 316L/DLC pair decreased 37%, while 316L/316L pair decreased 71% compared to the same pairs in air conditions. This can be related to polar additives contained in 5W30 oil which leads to reducing wear in 316L pairs.
Biografia do Autor
Romina Paula Castro Costa, INPE
Degree in Physics by Sao Paulo State University - UNESP (2004). Master of Materials Engineering and Technology by National Institute for Space Research - INPE (2007). Experience in Molecular Beam Epitaxy system (MBE) and characterization capacity using RHEED, Hall Effect and X-Ray in the Bragg Brentano mode and Grazing Incidence. Currently a Ph.D. student in the National Institute for Space Research. Experience in characterization of materials deposited or modified by plasmas and also in the qualification of solid and hybrid lubricants for space, industrial and medical applications. Capacity characterization and assessment of friction, wear, hardness and adhesion of thin films. Besides operate, Ion cromatography, FTIR, Optical Profilometer, Raman Spectroscopy and Contact Angle system.
