RAFAEL MORGADO BATISTA
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Artigo IPEN-doc 25823 Sintering evaluation of doped lanthanum gallate based on thermodilatometry2019 - BATISTA, R.M.; REIS, S.L.; MUCCILLO, R.; MUCCILLO, E.N.S.The sintering behavior of La0.9Sr0.1Ga0.8Mg0.2O3-δ oxide-ion conductor was systematically investigated by thermodilatometry. The shrinkage data obtained with heating rates of 4, 7, 10 and 12 °C min−1 were analyzed by the constant rate of heating model and by construction of the master sintering curve. Validation of the master sintering curve was carried out by measurements of density in conventionally sintered specimens. Slight anisotropy of shrinkage data was found and changes to the basic equation of density was proposed to account for this effect. Plotting the data determined by the constant rate of heating model versus density allowed an easy identification of the density range of constant activation energy. The activation energy (865 kJ mol−1) obtained from the master sintering curve correlates quite well with that (874 kJ mol−1) obtained by the constant rate of heating model.Artigo IPEN-doc 24860 A versatile software for construction of the master sintering curve2018 - BATISTA, R.M.; NARANJO, J.F.R.; MUCCILLO, E.N.S.Several models have been developed over the last years to study the microstructure development of ceramic and metal powders during sintering. Among the most utilized methodology one may find the Arrhenius and the so-called Master Sintering Curve (MSC). Both models involve manipulation of a large number of data, and repetitive and time-consuming calculations. In this work, was developed a versatile and friendly-user software for a PC-type computer encompassing both methodologies. The software is flexible allowing for kinetic data evaluation such as the activation energy for sintering and sintering maps. Details of the software along with its application to investigate the sintering process of 10 mol% gadolinia-doped ceria are described.Artigo IPEN-doc 16578 Structure, microstructure and electrical conductivity of 8YSZ containing NiO2011 - BATISTA, R.M.; MUCCILLO, E.N.S.