Avaliação da sinergia entre aditivos iônicos e revestimentos TiN na resistência ao desgaste

Abstract

The increase in the lifespan of mechanical components primarily depends on the material's resistance to wear and corrosion and the nature of the contact between them. In this context, research in the development of lubricants and surface coatings has significantly advanced in recent years, aiming to enhance the tribochemical properties of metallic contacts.Regarding lubricants, the growing use of ionic liquids (ILs) has been observed due to their characteristics that improve lubrication, heat transfer, and lubricant durability. This study aims to analyze the tribochemical interactions between ionic liquids and Titanium Nitride (TiN) coatings deposited via the Plasma-Assisted Physical Vapor Deposition (PVD) process using the magnetron 4 sputtering technique, with a potential of -100 volts, current of 0.1 A, and a target-to-substrate distance of 350 mm, on SAE 1045 steel disks.To evaluate the tribological performance of this material with and without lubricant, pin-on-disk tests were conducted. The lubricant used was synthetic Polyalphaolefin (PAO) oil, supplemented with 1-Butyl-3-Methylimidazolium Octyl Sulfate ionic liquid at concentrations of 0.5% and 1%. The wear on the disk surfaces after the tribological test was analyzed using optical microscopy, microhardness measurements, and profilometry.The results showed a considerable reduction in surface wear and friction coefficient when using the lubricant and coated surfaces. These findings demonstrate the synergy between the additive and the TiN coating, highlighting its potential application in machine components to extend their operational life.