Person: Illana Sánchez, Andrea
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First Name
Andrea
Last Name
Illana Sánchez
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Ingeniería Química y de Materiales
Area
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3 results
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Item Recubrimientos protectores para incrementar la vida en servicio de materiales que operan en condiciones extremas(2020) Illana Sánchez, Andrea; Pérez Trujillo, Francisco Javie; Mato Díaz, María SoniaEsta Tesis Doctoral se titula “Recubrimientos protectores para incrementar la vida en servicio de materiales que operen en condiciones extremas”. En ella se ha explorado la posibilidad de utilizar recubrimientos duros de nitruros de metales de transición para proteger componentes de acero de turbinas de vapor ultrasupercríticas. Así, se aborda la mejora de la eficiencia energética de las centrales termoeléctricas, desde el punto de vista de la Ciencia de los Materiales y de la Ingeniería Metalúrgica. Mediante el aumento de 30ºC y de hasta 7.5 MPa respecto a las centrales ultrasupercríticas más eficientes actualmente instaladas, que trabajan a 620ºC y 30 MPa, se logran obtener rendimientos superiores al 50%. De esta forma se contribuye a mitigar las emisiones de gases de efecto invernadero, responsables del calentamiento global y del cambio climático, en un 25%...Item Corrosion Behavior of VM12-SHC Steel in Contact with Solar Salt and Ternary Molten Salt in Accelerated Fluid Conditions(Energies, 2021) García-Martin, Gustavo; Lasanta Carrasco, María Isabel; Miguel, Maria T. de; Illana Sánchez, Andrea; Pérez-Trujillo, Francisco J.Ternary low melting point mixtures with the addition of LiNO3 and Ca(NO3)2 have been presented as direct system candidates for CSP technologies due to having better physical and chemical properties than those of Solar Salt. In this study, thermal, physical and chemical properties are measured as is the corrosive behavior of stainless alloy VM12 (Cr 12%) when in contact with Solar Salt, 60% NaNO3-40% KNO3 (wt.%) and ternary 46% NaNO3-19% Ca(NO3)2-35% LiNO3 (wt.%). Gravimetric weight change measurements were performed on the test specimens, which were tested under accelerated fluid conditions (0.2 m s−1) at 500 °C for 2000 h. This research confirms the potential of this novel formulation as a thermal storage medium and validates the suitability of ferritic VM12-SHC stainless steel as a structural material for CSP technology with Solar Salt. Meanwhile, the results obtained by scanning electron microscopy and X-ray diffraction indicate a reduction in the protective character of the oxide layer formed on this alloy when the medium contains calcium and lithium components.Item Experimental study on steam oxidation resistance at 600 °C of Inconel 625 coatings deposited by HVOF and laser cladding(Surface and Coatings Technology, 2022) Illana Sánchez, Andrea; De Miguel Gamo, María Teresa; García Martín, Gustavo; Gonçalves, F.P.; Sousa, M.G.; Pérez Trujillo, Francisco JavierInconel 625 (IN625) coatings were deposited by High-Velocity Oxy-fuel (HVOF) and laser cladding, on a 10.50–12%Cr steel to improve its oxidation resistance. Both as-deposited coatings exhibited a γ-Ni-Cr matrix and two protective oxides (Cr2O3 and NiCr2O4). In addition, laser cladding as-deposited coatings also presented precipitates A2B-type Laves phases due to the dilution effect from laser cladding technique. Coated and uncoated steel were oxidized under isothermal conditions at 600 ◦C for 2000 h and subsequently analyzed using gravimetry, SEM-EDS and XRD techniques. The application of IN625 coatings revealed a weight gain ten times lower than that registered for the uncoated steel, this improvement being mainly due to the presence of protective and stable Cr2O3 and NiCr2O4 oxides. Additionally, the XRD analysis showed that the initial Laves phases present in the laser cladding coating, were re-dissolved and transformed in δ-Ni3Nb compound suggesting that that the temperature and exposure time are enough to induce this transformation.