Banca de DEFESA: MANUELLA BATISTA PADILHA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MANUELLA BATISTA PADILHA
DATE: 31/08/2021
TIME: 14:30
LOCAL: Google Meet
TITLE:
KEY WORDS:

ceramics composites, alumina-zirconia, rare Earth oxide Dy2O3, ceramic coating, crude oil

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The oil industry faces a critical problem in the oil storage process because of the degradation of tanks made of metallic materials. An alternative to remedy the degradation of these tanks is the use of coatings more resistant to the weathering created by oil, which is a highly corrosive and chemically reactive product. Thus, there is a demand for the development of materials for this purpose. Due to their high corrosive resistance, ceramic materials are favorable for such application. Alumina-based ceramics are one of the most used when the demand is for material with high tenacity and mechanical resistance. Studies report that ceramics based on alumina have their properties improved and their intrinsic brittleness reduced, with incorporation of zirconium oxide, among others. Furthermore, its qualities, namely toughness, mechanical resistance and hostile environment, increase even more with small incorporations of rare earth oxides. In this context, in the present work, alumina-zirconia ceramic composites were produced, reinforced with rare earth oxide (Dy2O3), varying the percentages by weight of dysprosium oxide in 1% and 3%, and zirconia in 5%, 10%, 15% and 20% by weight. The composites were produced through a thermomechanical process and sintering at a temperature of 1350o C and their mechanical properties and structural and microstructural characteristics were studied using Vickers microhardness, x-ray diffraction, optical microscopy and scanning electron microscopy (MEV). The composites were tested before and after immersion in crude oil to study the stability of the material developed. The results showed good particle size and distribution homogeneity. The DRX and SEM results showed that there was no change in the crystalline phase of the composite and that there is physical and chemical stability when in contact with crude oil. Therefore, the results show that the composites produced are suitable for use as ceramic coating for the oil industry.

BANKING MEMBERS:
Externo ao Programa - 1130522 - JOSE CARLOS DA SILVA OLIVEIRA
Interno - 2296912 - OSCAR OLIMPIO DE ARAUJO FILHO
Presidente - 2320860 - YOGENDRA PRASAD YADAVA