SONIA REGINA HOMEM DE MELLO CASTANHO

SONIA REGINA HOMEM DE MELLO CASTANHO

(Fonte: Lattes)

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Graduada em Engenharia de Materiais (UFSCar, Universidade Federal de São Carlos), Mestre em Tecnologia Nuclear (IPEN/USP, Universidade de São Paulo) e Doutora em Ciências Químicas-Cerâmicos (UAM/ES -ICV/CSIC, Universidad Autónoma de Madrid, Espanha e Instituto de Ceramica y Vidrio/CSIC de Espanha). Ela é Pesquisadora Senior e atualmente Gestora Adjunta em Pesquisa e Desenvolvimento do Centro de Ciências e Tecnologia de Materiais (CCTM) do Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP). É Professora da Universidade de São Paulo (USP), no programa de posgraduação Tecnologia Nuclear - Materiais. Coordenadora do grupo de pesquisas (GP/CNPq) em Materiais e Meio Ambiente. Principais áreas de atuação: - Energias Renováveis (células a combustível, catalizadores e biomassa), - Ambiental (mitigação, inertização e requalificação de efluentes e subprodutos de processos extrativistas e industriais, diretivas ambientais (RhOS, WEEE)), - Cerâmicas Biocompatíveis (vidros, compósitos multifuncionais para a implantologia). Experiência em gestão de Centro de Pesquisas, gestão ambiental, gestão de projetos, planejamento composicional de materiais, processamento coloidal, reologia, vidros e vitroceramicos, compósitos multifuncionais e nanoestruturas naturais. (Texto extraído do Currículo Lattes em 27 dez. 2021)

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Thermal properties of a barium borom silicate glass as a sealant for use in anode-supported solid oxide fuel cells
2015 - SILVA, MAVIAEL J.; REIS, SIGNO T. dos; MELLO CASTANHO, SONIA R.H. de
The Solid oxide fuel cell is a very efficient and clean source of energy. The planar design of SOFC requires sealant at the edges of the cell to prevent fuel leakage (H2, CH4, etc) and air mixing at its working temperature (700 to 900°C). The extreme operation conditions of current cell designs involve both high temperatures and highly corrosive environments. As a consequence is necessary a material to seal the chambers of the anode and cathode along each cell unit (the anodecathode-electrolyte and interconnects). The present work is an attempt to engineering glass compositions based on the BaO-Al2O3-SiO2-B2O3 system chosen due its thermal properties and good glass forming tendency. The glass formation or stability against crystallization and the coefficient of thermal expansion were determined by Differential Scanning Calorimeter and Dilatometric analysis, including sinterization curves. The main subject of this work is the development and selection of sealing glasses composition for SOFCs applications and also the development of new methodologies for preparation and evaluation of glass ceramics suitable for SOFC seals applications.
YZrO2-Ni cermet processing by high energy milling
2008 - RESTIVO, THOMAZ A.G.; MELLO CASTANHO, SONIA R.H.
A new method for SOFC fuel cell anode preparation is proposed where the main difference lies over cermet powder processing by high energy milling. Yttria stabilized zirconia powder and metallic nickel undergo co-milling in a vibratory device employing zirconia bead media. Dispersed and homogeneous powders are therefore obtained. The material is pressed uniaxialy and sintered at 1350°C for 0,5 h in air and under argon and hydrogen. In the former case, partial nickel oxidation occurs before sintering leading to small shrinkage down to 2% and porosity about 38%. Linear shrinkages from 5 to 7% after sintering in both inert and reduced atmospheres were observed not demanding pore-former additives. Conventional YSZ, Ni and NiO powder mixtures were prepared for comparison purpose. The high energy milling process is able to reduce the starting sintering temperature by 130° C besides a higher densification compared to the simple mixtures YSZ+Ni. The excessive sintering and particle coalescence is absent in high energy milled material, where the metal is well dispersed and the microstructure is highly homogenous. The high energy milling process is a promising route to prepare with excellent performance anode materials for SOFC cells.
Synthesis characterization and sintering of cobalt-doped lanthanum chromite powders for use in SOFCs
2010 - YAMAGATA, CHIEKO; MELLO-CASTANHO, SONIA R.H.
Doped lanthanum chromite is a promising as interconnect material because of its good conductivity at high temperatures and its stability in oxidizing and reducing atmospheres. Perovskite oxide powders of Co-doped lanthanum chromite were synthesized by dispersing precursor metal salt solutions in a polymer matrix followed by a thermal treatment. XRD patterns showed that a highly crystalline cobalt-doped lanthanum chromite was obtained. Fine perovskite powder with a surface area of 6.15 m2 g -1 calcined at 700oC for 1 h, were obtained. After the sample sintered at 1450oC for 3h, the powder reached high densities exceeding 97% of the theoretical density. The proposed here has proved to be a very promising technique for the synthesis of lanthanum chromite powders.
New integrated cermet powder preparation and consolidation method-NiZrO2 case
2010 - RESTIVO, THOMAZ A.G.; MELLO CASTANHO, SONIA R.H.
Advanced multi-metallic SOFC anode development by mechanical alloying route
2010 - RESTIVO, T.A.G.; LEITE, D.W.; MELLO CASTANHO, S.R.H.
Determining the lanthanum chromite zeta potential in aqueous media
2010 - SETZ, LUIZ F.G.; MELLO CASTANHO, SONIA R.H.