Banca de QUALIFICAÇÃO: RONALDO RODRIGUES RAMOS DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RONALDO RODRIGUES RAMOS DA SILVA
DATE: 15/11/2024
TIME: 09:00
LOCAL: google meets
TITLE:

Electrochemical Wear in Electric Vehicles: An Experimental Investigation on the Effectiveness of Ionic Liquids and Diamond-Like Carbon Coatings

KEY WORDS:

electric vehicles, reduction gearboxes, wear, electrolytic erosion, electrolysis, DLC, ionic liquid, lubricant, bearings.

PAGES: 74
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The growing demand for electric vehicles (EVs) has driven the need to improve the durability and efficiency of their components, especially gearboxes. Due to the high rotation of electric motors, these gearboxes use lubricants to reduce friction and wear. However, the presence of electric currents in these systems can generate electrochemical phenomena, such as electrolytic erosion, accelerating the wear of components, especially bearings. The present study aims to investigate the wear mechanisms in bearings of EV gearboxes, subjected to the action of continuous electric currents, and propose solutions to mitigate these problems. For this purpose, wear tests were performed using a pin-on-disc machine, simulating the operating conditions found in real bearings. Samples of tempered SAE 52100 steel, commonly used in bearings, were subjected to different levels of electric current in an environment lubricated with PAO 6, an oil with a viscosity similar to those used in EV gearboxes. In order to reduce wear, two strategies will be tested: the deposition of a protective diamond-like carbon (DLC) film on the bearing surface and the addition of a high-performance ionic liquid to the lubricant. DLC is known for its high hardness and abrasion resistance, while ionic liquids have lubricating and dielectric properties, capable of inhibiting electrochemical reactions. Previous studies indicate that both the DLC film and the ionic liquid additive were effective in significantly reducing the wear rate, when compared to tests without protection. The combination of these two strategies promises to be even more promising, suggesting a synergistic effect in protecting against wear. The electrification of mechanical systems, such as EV gearboxes, introduces new challenges related to the interaction between mechanical and electrical components. In addition to electrochemical phenomena, other factors can influence wear, such as temperature, vibration and lubricant contamination. This work contributes to the advancement of knowledge about wear mechanisms in electromechanical components and presents innovative solutions to extend the service life of EV gearboxes. The results obtained can be applied in other areas where electrification generates problems of wear due to electrochemical corrosion.

COMMITTEE MEMBERS:
Presidente - 1481705 - SALETE MARTINS ALVES
Interno - 3138731 - RAPHAEL ARAUJO CARDOSO
Externo ao Programa - 349577 - CLEITON RUBENS FORMIGA BARBOSA - UFRN