Persona: García-Martínez, María
Dirección de correo electrónico
Fecha de nacimiento
Proyectos de investigación
Unidades organizativas
Puesto de trabajo
Apellidos
García-Martínez
Nombre de pila
María
Nombre
4 resultados
Resultados de la búsqueda
Mostrando 1 - 4 de 4
Publicación Acceso Abierto Characterization of 3D-printed cordierite-rGO nanocomposites for aerospace applications(Scipedia, 2025-06-26) Esguerra Arce, Ingrid; García Juárez, Álvaro; Garcia-Martinez, Juan; Hidalgo García, Javier; Plaza Gallardo, Borja; Giménez Pérez, Raquel; Ulargui, S.; Berges Serrano, Cristina; Herranz Sánchez-Cosgalla, Gemma; García-Martínez, María; Agencia Estatal de Investigación (AEI)One of the most critical challenges in the aerospace industry is the mismatch in the coefficient of thermal expansion (CTE) between optical components in satellites and their metallic supports, which limits system reliability and performance. Ceramic materials, due to their superior thermal properties, offer a potential solution however, their adoption has been limited by the complexity of their geometries and conventional manufacturing constraints. Additive manufacturing has opened new opportunities for the development of advanced ceramics, including ceramic matrix composites (CMCs). Within the framework of the AERORECORD-3D project, funded by the Spanish Ministry of Science and Innovation, ceramic cordierite-based supports reinforced with reduced graphene oxide (rGO) have been developed for aerospace applications. In this study, cordierite nanocomposites with varying rGO contents were successfully fabricated via 3D printing. Their thermal, electrical, and mechanical properties were evaluated to assess their performance, exploring their potential as advanced materials for demanding space applications. This work represents a significant step toward the implementation of 3D-printed ceramic nanocomposites by combining innovative materials with advanced additive manufacturing technologies.Publicación Acceso Abierto Failure analysis of a fractured control presure tube from an aircraft engine(WASET, 2022-03-22) Valles González, M. P.; González Meije, A.; Pastor Muro, Ana; García-Martínez, María; González Caballero, B.Multiple cases of fuel control pressure tube fractures from aircraft engines have been reported. The aim of the present study is to determine the cause of this tube fracture. The studied set was composed by the mentioned tube, a welded connecting pipe, where the fracture has been produced, and a union nut. The fracture has been produced in one most critical zones of the tube, in a region near to the supporting body of the union nut to the connector. Visual examination and microscopic observation through a stereo microscope of the tube fracture surface has been carried out to determine the macrofractographic features. The results revealed a plastic macrodeformation of the tube, a damaged surface and signs of a possible corrosion process. The material has been chemical, mechanical and microstructural characterized. The results confirmed that specifications were fulfilled. Fracture surface was also inspected by scanning electron microscopy to determine the microfractographic features in order to find out the failure mechanism involved in the fracture. Fatigue striations, which are typical from a progressive fracture by a fatigue mechanism have been observed. The origin of the fracture has been placed in defects located in the outer wall of the tube, leading to a final overload fracture.Publicación Restringido Low temperature MOCVD process for fast aluminium deposition on metallic substrates(Wiley, 2005-12-19) Agüero, Alina; Gutiérrez del Olmo, Marcos; García-Martínez, MaríaA CVD pilot plant, designed and built in INTA, is presently being used to deposit aluminium coatings with applications in the fields of industrial and aeronautic turbines, as well as on the protection of components employed in the chemical industry, waste incinerators, fuel cells, and for the replacement of Cd coatings in aeronautic components. The industrial process currently used to coat aeronautic and industrial turbine components employs AlCl3 as precursor at 700–1100 °C and requires more than 12 h per batch (including loading, heating, coating and cooling) due to the relatively low deposition rates and the long heating and cooling cycles. The new process carried out at INTA employs an organometallic precursor, which results in higher deposition rates, at 280–350 °C with a total processing time lower than 5 h per batch. As in any other CVD process, this one allows deposition of coatings in complex geometry components such as on the inner surfaces of turbine blades and heat exchangers tubes. Other important advantages of this particular process are the possibility of recovering and re-utilising the unreacted precursor as well as the high purity of the produced coatings in comparison with those produced by other commercially available technologies. It is well known that the higher the contamination degree, the lower the useful life of this type of coatings. The pilot plant has a deposition chamber with a useful coating zone of 30 cm in length and 18 cm in diameter, heated by a three zone furnace equipped with a pumping system that allows working pressures of 0.1–100 mbar. The system can be manually or automatically controlled and can be easily adapted to deposit other materials. By heat treating the pure Al coatings deposited on Ni base superalloys, Ni aluminide coatings have been obtained and excellent cyclic oxidation behaviour has been observed at 1000 °C. Al has also been deposited on ferritic steels (P91 and 92) and after a suitable heat treatment Fe aluminide coatings with excellent steam oxidation resistance have been obtained. Another potential important use of this process is the deposition of dense aluminium coatings for cadmium replacement in several industrial applications.Publicación Restringido Corrosion study of a water filter(Elsevier, 2022-07-22) Valles González, M. P.; Pastor Muro, Ana; García-Martínez, María; Instituto Nacional de Técnica Aeroespacial (INTA)A water filter was inspected in order to determine the origin and chemical nature of several corrosion products on its surface. The metallic material base was analyzed to be a lead brass with a nickel coating of 4–5 µm thickness. The plastic base, as well as the rod and nut, was impregnated by similar deposits whose chemical nature was mainly oxides, carbonates and chlorides, according to the EDX analysis. Some white deposits were observed in the nut and rod, probably corresponding to zinc oxide. These deposits may be formed upstream by the pipe materials or the sediments that the fluid may carried inside the pipe. The absence of a nickel coating leaded to corrosion pits in some areas of the rod and nut. This corrosion has initiated on the surface, and has progressed through the beta phase that was zinc impoverished, to the inner zone of the filter.
