Banca de QUALIFICAÇÃO: LUCIANO LUCAS FERNANDES LIMA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCIANO LUCAS FERNANDES LIMA
DATE: 25/01/2023
TIME: 15:00
LOCAL: Sala 414 CTEC
TITLE:

Study of plasma deposition using new configuration in cathode cage: evaluation through thin film deposition of MoS2 on AISI 1020

KEY WORDS:

Deposição a Plasma, Cilindros catódicos, lubrificante sólido, gaiola catódica

Plasma deposition, Cathodic Cylinders, solid lubricant, cathodic cage.

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The use of solid lubricating films makes it a great option for controlling wear and friction under certain operating conditions, in addition to not attack the environment. Thus, this work aims to carry out a study on plasma deposition with cathodic cage of MoS2 thin films on AISI 1020 steel substrates. From an adaptation of the cathode cage named cathode cylinders, the samples were treated in cathodic and floating potential with temperatures of 300 °C, 350 °C and 400 °C, all with an atmosphere rich in argon, as a way of studying its deposition in the two potential configurations. After the treatments, they were subjected to chemical analysis by X-ray diffraction (XRD) and Raman spectroscopy, in addition to a calotest tribological test. It was possible to quantify the coating thickness using scanning electron microscopy (SEM). In general, the results indicated success in the deposition of molybdenum disulfide in all samples treated in floating potential, and in the formation of sulfide compounds in cathode potential, as it was possible to visualize in the XRD. It was also possible to qualify the film by observing the vibration bands after deconvolution of Raman spectroscopy, since it indicated the presence of peaks referring to MoS2 and its compounds. Finally, there was a significant reduction in wear through the calotest.

COMMITTEE MEMBERS:
Externo à Instituição - IGOR OLIVEIRA NASCIMENTO - NENHUMA
Externo à Instituição - MAXWELL SANTANA LIBÓRIO - UFRN
Interna - 2614274 - MICHELLE CEQUEIRA FEITOR
Presidente - 2550377 - THERCIO HENRIQUE DE CARVALHO COSTA