ARÉVALO MORA , Cristina María

This study aims at the analysis of the reaction layer between titanium matrices and reinforcements: B4C particles and/or intermetallic TixAly. Likewise, the importance of these reactions was observed; this was particularly noteworthy as regard coherence with the obtained results and the parameters tested. Accordingly, five starting material...

Nowadays, the development of high specific modulus materials involves studies of new materials and novel manufacturing routes. From the point of view of composite materials, titanium composites (TMCs) have been long studied for their interesting properties, as a result of the conjunction of low-density and high mechanical properties, as well...

Dentro de las técnicas más innovadoras de fabricación aditiva, va cogiendo fuerza la denominada Fused Filament Fabrication (FFF) o Fabricación por Filamento Fundido. Tradicionalmente, sólo se han producido piezas en materiales poliméricos (FDM, Fused Deposition Modelling), pero las ventajas que presenta han estimulado la investigación y...

Hoy en día el interés por desarrollar nuevos materiales que satisfagan las necesidades tecnológicas, conlleva a un estudio continuo en la innovación de los procesos de fabricación. La ventaja que ofrecen las técnicas pulvimetalúrgicas de procesado en caliente convencional (HP) y directa (dHP), suponen un ahorro en tiempo que puede favorecer la...

In this work, a study of the influence of the starting materials and the processing time used to developW/Cu alloys is carried out. Regarding powder metallurgy as a promising fabrication route, the difficulties in producingW/Cu alloys motivated us to investigate the influential factors on the final properties of the most industrially demanding...

La técnica de fabricación aditiva conocida como Plasma Transferred Arc (PTA), permite el procesado de piezas con geometrías muy complejas mediante la deposición capa a capa del material. En esta técnica, la fuente de energía encargada de la fusión de cada capa es un plasma. En esta investigación, una pieza de la aleación de base níquel conocida...

Los materiales compuestos de base titanio son materiales muy valorados por sus excelentes propiedades específicas. El interés por desarrollar estos materiales mediante técnicas aditivas, en particular con el método conocido como Plasma Transferred Arc, es el punto de partida de esta investigación. Por ello, se estudiaron especímenes con...

High specific modulus materials are considered excellent for the aerospace industry. The system Ti-TiAl-B4C is presented herein as an alternative material. Secondary phases formed in situ during fabrication vary depending on the processing conditions and composition of the starting materials. The final behaviors of these materials are therefore...

El titanio y sus aleaciones son materiales de gran demanda en la industria aeroespacial que presentan un alto coste de producción. Por ello, en la actualidad, existe un gran interés en el desarrollo de técnicas de fabricación que reduzcan costes como, por ejemplo, evitando pérdidas innecesarias de material durante el conformado de geometrías...

En cuanto a los materiales compuestos de base titanio (TMC), sus propiedades dependen en gran medida del material de refuerzo empleado para su fabricación; dando lugar a una gran diversidad de investigaciones sobre los TMCs. Considerando la diversa tipología del refuerzo, en este estudio se trabajó con seis tipos de partículas cerámicas: B₄C,...

La fabricación industrial de componentes a partir de materiales base hierro y base níquel se ha venido llevando a cabo comúnmente mediante diversos métodos tradicionales, buscando la producción en masa de piezas básicas. Las exigencias geométricas de las piezas, en general, han obligado a la realización de procesados secundarios. Esto conlleva...

This research is focused on the influence of processing temperature on titanium matrix composites reinforced through Ti, Al, and B4C reactions. In order to investigate the effect of Ti-Al based intermetallic compounds on the properties of the composites, aluminum powder was incorporated into the starting materials. In this way, in situ TixAly...

La fabricación aditiva ha despertado gran interés en la industria metalúrgica debido a que la producción de piezas cercanas a su geometría final reduce los costes de producción comparado con los métodos de fabricación tradicional, ahorrando en energía, tiempo de producción y materia prima. El ahorro en material es especialmente significativo si...

In the last decade, titanium metal matrix composites (TMCs) have received considerable attention thanks to their interesting properties as a consequence of the clear interface between the matrix and the reinforcing phases formed. In this work, TMCs with 30 vol % of B4C are consolidated by hot pressing. This technique is a powder metallurgy...

High Velocity Oxygen Fuel (HVOF) thermal spray coating is a deposition process that is widely employed at present to improve surfaces and the remanufacturing of components subject to severe wear, offering an alternative to reduce the cost of spare parts and used as a substitute for electro-chromium, also generating greater thickness than...

This work focuses on the study of the microstructure, hardening, and stiffening effect caused by the secondary phases formed in titanium matrices. These secondary phases originated from reactions between the matrix and boron particles added in the starting mixtures of the composites. Not only was the composite composition studied as an...

The purpose of this research is to study the influence of the processing conditions that affect the final behaviour of specimens made from a 17-4PH composition powder without the necessary thermal treatment to be considered 17-4PH, which is manufactured using the additive technique known as plasma metal deposition (PMD). To that end, two walls...

Plasma metal deposition (PMD) is an interesting additive technique whereby diverse materials can be employed to produce end parts with complex geometries. This study investigates not only the effects of the manufacturing conditions on the final properties of 316L stainless steel specimens by PMD, but it also affords an opportunity to study how...

This research was carried out to determinate the effect of the atmosphere processing conditions (air and argon) and two specific thermal treatments, on the properties of specimens made from the nickel-based alloy Hastelloy C-22 by plasma transferred arc (PTA). Firstly, the additive manufacturing parameters were optimized. Following, two walls...

In this research work, the fabrication of biphasic composite implants has been investigated. Porous, commercially available pure Ti (50 vol % porosity and pore distributions of 100–200, 250–355, and 355–500 μm) has been used as a cortical bone replacement, while different composites based on a polymer blend (gelatin and alginate) and bioactive...

The utilization of porous biomedical implants featuring a bimodal microstructure has garnered substantial interest within the scientific community. This study delves into the intricate interplay between processing parameters, microstructural attributes, and the tribo-mechanical performance of titanium grade 4, showcasing its potential to serve...

The design of bone implants with proper biological and mechanical properties remains a challenge in medical implantology. The use of bioactive coatings has been shown to improve the biocompatibility of the implant surface. In this study, a new approach including porous scaffolds, β-Ti alloys and nanocoatings to design new bone implants is...

Irradiated fuel pellet present a radial gradient porosity as a result of the occurrence of He gas and other fission products that modify its nuclear fuel microstructure. Cerium Oxide, CeO2, has been shown as a surrogate material to understand irradiated Mixed Oxide (MOX) based matrix fuel for nuclear power plants due to its similar...