Persona: del Hoyo Gordillo, Juan Carlos
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del Hoyo Gordillo
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Juan Carlos
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Publicación Restringido Aluminum slurry coatings to replace cadmium for aeronautic applications(Elsevier, 2012-10-27) Agüero, Alina; del Hoyo Gordillo, Juan Carlos; García de Blas, Javier; García, M.; Gutiérrez, M.; Madueño, L.; Ulargui, S.Cadmium has been widely used as a coating to provide protection against galvanic corrosion for steels and for its natural lubricity on threaded applications. However, it is a toxic metal and a known carcinogenic agent, which is plated from an aqueous bath containing cyanide salts. For these reasons, the use of cadmium has been banned in Europe for most industrial applications. However, the aerospace industry is still exempt due to the stringent technical and safety requirements associated with aeronautical applications, as an acceptable replacement is yet to be found. Al slurry coatings have been developed as an alternative to replace cadmium coatings. The coatings were deposited on AISI 4340 steel and have been characterized by optical and electron microscopy. Testing included salt fog corrosion exposure, fluid corrosion exposure (immersion), humidity resistance, coating-substrate and paint-coating adhesion, electric conductivity, galvanic corrosion, embrittlement and fatigue. The results indicated that Al slurry coatings are an excellent alternative for Cd replacement.Publicación Restringido HVOF-Deposited WCCoCr as Replacement for Hard Cr in Landing Gear Actuators(Springer Nature Link, 2011-10-05) Agüero, Alina; Camón, F.; García de Blas, Javier; del Hoyo Gordillo, Juan Carlos; Muelas Gamo, Raúl; Santaballa, A.; Ulargui, S.; Vallés, P.WCCoCr coatings deposited by HVOF can replace hard Cr on landing gear components. Powders with two different WC particle sizes (micro and nano-) and geometries have been employed to study the effects on the coating’s properties. Moreover, coatings produced employing two sets of parameters resulting in high and low flame temperatures have been evaluated. Minor differences in microstructure and morphology were observed for the two powders employing the same spraying parameters, but the nano-sized powder exhibited a higher spraying efficiency. However, more significant microstructural changes result when the low- and high-energy spray parameters are used. Moreover, results of various tests which include adhesion, wear, salt fog corrosion resistance, liquid immersion, and axial fatigue strength, indicate that the coatings produced with high-energy flame are similar in behavior. On the other hand, the nanostructured low-energy flame coating exhibited a significantly lower salt fog corrosion resistance.Publicación Restringido Metamateriales nanoestructurados para criostatos de uso espacial(RIA-MAD4SPACE 2025, 2025-04) Madueño, L.; Velázquez, E.; Ramos Somolinos, David; Díaz, A.; Scheneider, M.; Plaza Gallardo, Borja; Poyatos Martinez, David; del Hoyo Gordillo, Juan Carlos; Urqui, R.; Worgull, M.; Martín, B.; Arribas, P. J.; Sanz, RuyEl aislamiento térmico y electromagnético (desde DC hasta GHz) en criostatos terrestres y espaciales es fundamental para garantizar un entorno de trabajo adecuado para la instrumentación de próxima generación. En el caso de los detectores de rayos X, el aislamientosimultáneosevuelvecrucialparalossensoresdebordedetransición,comolosdelinstrumentoX-IFU (misión ATHENA)[1]. Los materiales estructurales y de revestimiento interno de los criostatos son clave para alcanzar los niveles de aislamiento más exigentes. De hecho, la elección de los materiales requiere un equilibrio delicado, por ejemplo, en cuanto a peso, compatibilidad con el vacío, propiedades electromagnéticas y conductividad térmica. Sin embargo, algunos metamateriales nanoestructurados[2] pueden ser diseñados de forma apropiada y ofrecer respuestas personalizadas y mejores rendimientos que los materiales monofásicos/componentes. No obstante, estos metamateriales deben ser compatibles con las temperaturas espaciales y criogénicas. Además, deben sintetizarse mediante métodos económicos y asequibles para que sean escalables y compatibles con las técnicas de fabricación. Para afrontarestereto,hemoselegidodostiposprincipalesdematerialesbase con baja conductividad térmica.(k): Poly-ether-ether-cetona (PEEK,k≈0.17W·m-1·K-1) siendo un polímero termoplástico técnico calificado para condiciones espaciales, de ultra alto vacío y criogénicas; y crecimiento de óxido sanódicos en titanio (k≤1.5W·m-1·K-1[4]),que es un material común en aplicaciones aeroespaciales.Publicación Restringido Magnetic Characterization of Permalloy Nanodome Surfaces on Flexible PEEK/TiO2 Vertical Nanotubes Composites(IEEE, 2022-10-10) Martín-Rubio, Carolina; Rivelles García, Alejandro; Schneider, Marc; del Hoyo Gordillo, Juan Carlos; Privitera, V.; Worgull, M.Poly-ether-ether-ketone (PEEK) composites present outstanding physical and chemical properties, including radiation tolerance and compatibility with vacuum and additive manufacturing processing. Applications of PEEK range from biomedical to aerospace. Controlled 3-D nanostructuring arises as a powerful approach to generate new phenomena suitable for technological applications. In this sense, we target to synthesize robust and shapeable magnetic nanocomposites (NCs) for sensing and electromagnetic shielding applications. For this aim, we synthesized and characterized Permalloy (Py, Ni80Fe20) nanostructured surfaces on PEEK/TiO2. These NCs were synthesized by scalable and high throughput compatible fabrication approaches: anodization (TiO2 nanotubes) and hot embossing (thermal nanoimprint). The resulting NCs are shapeable, stable below 300 °C, and vacuum compatible. Their surfaces compose TiO2 nanodomes filled by PEEK. Py layers (15 nm) were sputtered on NC and flat PEEK films. The characterization included SEM, AFM, ISO-2409 Adhesion Tests, hysteresis loops, and first-order reversal curves (FORCs). The results revealed that both types of films keep stable characteristics after bending cycles, and noticeable modifications of the magnetic global response and local interactions generated due to the 3-D nanostructure.Publicación Acceso Abierto Radiation and Dust Sensor for Mars Environmental Dynamic Analyzer Onboard M2020 Rover(Multidisciplinary Digital Publishing Institute (MDPI), 2022-04-10) Apéstigue, Víctor; Gonzalo Melchor, Alejandro; Jiménez Martín, Juan José; Boland, J.; Lemmon, M. T.; de Mingo Martín, José Ramón; García-Menéndez, Elisa; Rivas, J.; Azcue, J.; Bastide, L. ; Andrés Santiuste, N.; Martínez Oter, J.; González Guerrero, M.; Martín-Ortega, Alberto; Toledo, D.; Álvarez Ríos, F. J.; Serrano, F.; Martín Vodopivec, B.; Manzano, Javier; López Heredero, Raquel; Carrasco, I.; Aparicio, S.; Carretero, Á.; MacDonald, D. R.; Moore, L. B.; Alcacera Gil, María Ángeles; Fernández Viguri, J. A.; Martín, I.; Yela González, Margarita; Álvarez, Maite; Manzano, Paula; Martín, J. A.; del Hoyo Gordillo, Juan Carlos; Reina Aranda, Manuel; Urquí, R.; Rodríguez Manfredi, J. A.; De la Torre Juárez, M.; Hernández, Christina; Córdoba, Elizabeth; Leiter, R.; Thompson, Art; Madsen, Soren N.; Smith, Michael D.; Viúdez Moreiras, Daniel; Saiz López, A.; Sánchez Lavega, Agustín; Gómez Martín, L.; Martínez, Germán M.; Gómez Elvira, J.; Arruego, Ignacio; Instituto Nacional de Técnica Aeroespacial (INTA); Comunidad de Madrid; Gobierno Vasco; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI); National Aeronautics and Space Administration (NASA)The Radiation and Dust Sensor is one of six sensors of the Mars Environmental Dynamics Analyzer onboard the Perseverance rover from the Mars 2020 NASA mission. Its primary goal is to characterize the airbone dust in the Mars atmosphere, inferring its concentration, shape and optical properties. Thanks to its geometry, the sensor will be capable of studying dust-lifting processes with a high temporal resolution and high spatial coverage. Thanks to its multiwavelength design, it will characterize the solar spectrum from Mars’ surface. The present work describes the sensor design from the scientific and technical requirements, the qualification processes to demonstrate its endurance on Mars’ surface, the calibration activities to demonstrate its performance, and its validation campaign in a representative Mars analog. As a result of this process, we obtained a very compact sensor, fully digital, with a mass below 1 kg and exceptional power consumption and data budget features.Publicación Restringido Nanostructured metamaterials for the thermal and electromagnetic isolation of cryostats(SPIE, 2024-08-26) Vivas, Laura G.; Ramos Somolinos, David; Martín-Rubio, Carolina; Rivelles García, Alejandro; Madueño Custodio, Laura; Ruiz Clavijo, Alejandra ; Díaz, Alberto; Schneider, Marc; Plaza Gallardo, Borja; Poyatos Martinez, David; del Hoyo Gordillo, Juan Carlos; Caballero Calero, Olga; Worgull, M.; Martín Iglesias, Santiago; Martín Vodopivec, B.; Maicas, M.; Navas, David; Martín González, Marisol ; Sanz, RuyIn terms of thermal and electromagnetic isolation properties, Nanostructured Metamaterials may present important advantages compared to current employed materials. In this work, we present the synthesis routes and the preliminary characterization results of some metamaterials based on Poly-ether-ether-ketone and nanostructured anodic oxides, with low thermal conductivity, combined with Au nanocolumns and three-dimensional nanonetworks. The results reveals proper magnetic and electromagnetic properties and suggest their suitable use under vacuum and cryogenic conditions.
