This work considered the use of a nanofluid composed of Alumina and PAG oil (Polyalkylene Glycol) as a lubricant to improve the wear of a flat surface under direct contact with an iron sliding sphere. Alumina nanostructure was characterized using SEM and confocal microscope images, along with XRD patterns. The PAG oil samples, named PAG-46, were supplied by the company Montreal® and showed a viscosity level of 46mPa.s at the temperature of 40°C. The nanofluid was prepared through the dispersion of Alumina nanostructures in the PAG oil by stirring process for 15min at mass fractions of 0.1% and 0.5% to obtain a homogeneous and dispersed mixture. Thus, this mixture was sonicated for 2h to obtain a dispersed and homogeneous nanofluid. A volume of 2µl of nanofluid was spread on a flat polished aluminum surface where an iron sphere was put in contact with the surface to slide on it. The iron sphere was installed in a reciprocating sliding wear test with a stroke length of 2mm for 1h30min with a frequency of 2Hz to create a wear track. Thus, the aluminum flat samples were analyzed in a confocal microscope for the measurements of the wear level through the area and rugosity levels of each wear track. For comparison purposes three samples were considered in this study: PAG only (M1), Alumina-PAG 0.1wt.% (M2), and Alumina-PAG 0.5wt.% (M3). The results showed comparisons for the area and rugosity of the wear tracks generated by the iron sphere sliding on the aluminum surface for each nanofluid sample. The area of the wear track considering PAG only (M1) was higher than the area of samples M2 and M3. The M2 sample showed a wear track area about 2.5% smaller than the M1 sample, while the average rugosity of the M2 sample was about 20% higher than the M1 sample. The wear track area of the M3 sample showed a reduction of about 6% compared to the M1 sample. Conversely, the average rugosity of M3 samples was about 30% higher than the M1 sample. Overall, as the mass fraction of Alumina was increased, the wear level was decreased, while rugosity was increased. A reasonable interpretation of these outcomes is anchored in the phenomena of the Alumina nanostructures deposition on the surface of the wear track, protecting it from severe wear, thus the wear area was decreased. The increase in average rugosity relates to the spare Alumina nanostructures that were not deposited on the surface, generating peaks above the flat surface.
Bem-vindo(a) aos Anais do VII NanoMat, evento organizado pela Pós-graduação em Nanociências e Materiais Avançados da Universidade Federal do ABC (UFABC) com o intuito de reunir e debater trabalhos desenvolvidos por alunos e pós-doutorandos em Materiais e áreas afins.
Comissão Organizadora
Pedro Alves da Silva Autreto
Andre Luiz Martins de Freitas
Aryane Tofanello
Comissão Científica
Ferramenta completa de submissão, avaliação e publicação de anais para eventos científicos.
