Study of the stability of Ca2MgZrO6 and Ca2NiZrO6 ceramics in crude petroleum and their comparison of potentiality for use as ceramic substrates for temparature sensors in the petroleum industry

Reference	Presenter	Authors (Institution)	Abstract
12-058	Rebeka Oliveira Domingues	Domingues, R.O.(UNIVERSIDADE FEDERAL DE PERNAMBUCO); SILVA, N.D.(UNIVERSIDADE FEDERAL DE PERNAMBUCO); Domingues, R.O.(Universidade Federal de Pernambuco); Ferreira, R.A.(Universidade Federal de Pernambuco); YADAVA, Y.P.(UNIVERSIDADE FEDERAL DE PERNAMBUCO);	In petroleum extraction wells, various sensors are used to monitor parameters such as flow, pressure and temperature. However, the petroleum is highly corrosive and can cause equipment failure, damaging the process and generating high maintenance costs. Advanced ceramics appear as an alternative especially for high temperature environments. This work has as main objective to produce new complex perovskite oxide ceramics Ca2MgZrO6 and Ca2NiZrO6, for the encapsulation of temperature sensors. The constituent oxides were homogenized and calcined at 1150 ° C for 24 hours. The crystalline structures of the compounds were determined by X-ray diffraction which showed the formation of the complex cubic ordered perovskite structure with lattice parameters 8,0504A and 8,3438A, respectively. These ceramics were milled in an agate mortar, compacted by uniaxial pressing under pressure of 10ton/cm² and sintered at 1350 ° C for 24 hours. The mechanical properties of the sintered ceramics were analyzed by Vickers microhardness, where the Ca2NiZrO6 ceramics presented higher average hardness when compared to the Ca2MgZrO6 ceramics. Optical microscopy and SEM were used to analyze the microstructure of the sintered ceramics. After these tests, the samples were immersed in the crude petroleum and the tests of Vickers Microhardness, XRD, optical microscopy and SEM were performed again to verify the stability of the ceramics. The results obtained characterize the potential of these ceramics for applications as substrates for temperature sensors for the petroleum industry.
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