Development and characterization of Alumina-Titania ceramics composites reinforced with Ho2O3 for fabrication of inert coating in metallic tanks of petroleum industry.
Noelle D'Emery Gomes Silva1; Ricardo Artur Sanguinett Ferreira1; Yogendra Prasad Yadava1
1 Universidade Federal de Pernambuco
doi:10.20906/CPS/COB-2015-2596
Resumo
The need for developing technologies that enable the optimization of processes and transport of petroleum is notorious because of the importance of its derivatives in the modern society. Knowing that crude petroleum creates hostile environments due to the corrosive and chemically reactive nature, it is necessary to find materials that are able to withstand the imposed environment. In the process of transportation and storage of petroleum are used metallic materials, which undergo surface degradation becoming a critical problem in the petroleum industry. An alternative to solve this problem is the possibility of using alumina-based ceramic as an inert coating for harsh environments because they have a high mechanical strength and corrosion resistance. The intrinsic brittleness of ceramics is still a fatal factor for use of these materials in industrial applications and mechanical structures. To reduce the brittleness and increase strength and toughness, normally ceramics are reinforced with incorporation of one or more additives. Mechanical properties and toughness of ceramics based on alumina improve with the incorporation of TiO2, TiN, ZrO2, etc. Initial studies exhibit that the addition of small percentages of rare earth oxides on Alumina-Titania (Al2O3-TiO2) can greatly increase the toughness of these ceramics. In this work was produced ceramic composites Alumina-Titânia (Al2O3-TiO2) reinforced with rare earth oxide (Ho2O3), keeping 1% by weight of Holmia and 5%, 10%, 15% and 20% by weight titânia, presenting features of high mechanical strength and resistance to hostile environment created by crude petroleum. The composites were produced by a thermo mechanical process, sintered at a temperature of 1350°C and studied the structural, microstructural characteristics and mechanical properties by x-ray diffraction(XRD), optical microscopy (OM), scanning electron microscopy (SEM), and Vicker's microhardness. Analyses were performed before and after immersion in crude oil extracted from earth and offshore petroleum
Palavras-chave: ceramics composites; Alumina-Titania; reinforcement of Ho2O3; inert coatings; stability in crude petroleum