Banca de QUALIFICAÇÃO: ANTHUNES ÍKARO DE ARAÚJO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ANTHUNES ÍKARO DE ARAÚJO
DATE: 13/05/2024
TIME: 14:00
LOCAL: Videoconferência
TITLE:

DEPOSITION OF DLC FILM BY PLASMA USING CATHODIC CYLINDER TECHNIQUE

KEY WORDS:

DLC (diamond shaped carbon), plasma deposition, cathode cylinders, Tribology

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The study of this work is aimed at the deposition of diamond-shaped carbon thin films (DLC) on AISI 4340 steel by thermochemical treatment, using the cathode cylinder plasma deposition (CCyPD) technique in a nitriding reactor. This technique is a derivation of the cathode cage technique, but in this new technique only the cylinders that will be coupled to the cage cover are produced with the material you want to produce the film. The objective is to deposit thin films with desirable tribological properties, such as high surface hardness and low coefficient of friction. The study used samples of AISI 4340 steel, which underwent cathode cylinder deposition (CCyPD) treatments with different proportions of argon and acetylene gases for a period of 4 hours. The cylinder used was produced with graphite powder and compacted with a load of 2 tons. The characteristics of the deposited films were studied by X-ray diffraction, Raman Spectroscopy, Vickers Microhardness and pin-disk wear tests. The results showed that increasing acetylene in proportion to argon led to films with a diamond-like carbon structure. Furthermore, the friction coefficient was significantly reduced compared to an untreated sample, and the surface microhardness increased with increasing acetylene. Therefore, the cathode cylinder plasma deposition (CCyPD) technique allowed the deposit of thin films with DLC characteristics on the AISI 4340 substrate, offering potential for tribological applications. The results are consistent with previous studies that revealed the special properties of DLC, such as high hardness, low friction, high wear resistance and chemical inertness. The definition of films for cathode cylinders offers a new approach for the fabrication of high-performance coatings on metallic substrates, and the results of this study point to a predictive and technical effectiveness for the production of diamond-shaped carbon coatings on AISI steel. 4340.

COMMITTEE MEMBERS:
Interna - 2614274 - MICHELLE CEQUEIRA FEITOR
Interno - 2550377 - THERCIO HENRIQUE DE CARVALHO COSTA
Externo à Instituição - MAXWELL SANTANA LIBÓRIO - UFRN