GÓMEZ CUEVAS , Francisco De Paula

Esta tesis se basa en el reciclaje de los metales, se estudian los métodos de fabricación empleados para la creación de algunos de éstos, sobre todo del aluminio. En el que más se centra esta tesis es en la pulvimetalurgia, que consiste en la creación de metales a partir de polvos aleados mecánicamente.|

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Se ha fabricado polvo amorfo de la aleación Al75Fe25 a partir del polvo elemental cristalino de aluminio puro y hierro puro. El proceso de fabricación del polvo amorfo se ha llevado a cabo mediante molienda mecánica con una duración de hasta 100 horas. El objetivo de este trabajo consiste en determinar la evolución de la compresibilidad y de la...

This research focused on studying the effect of temperature on the mechanical properties of aluminium matrix composites (AMCs) obtained by a powder metallurgy route. Aluminium powder was milled at room temperature for 5 h and using di erent atmospheres in order to achieve di erent amounts of reinforcement. The atmospheres employed were vacuum,...

The crystallization process, both at the initial and subsequent stages, of amorphous Al88-RE4-Ni8 alloys (RE = Y, Sm and Ce) has been studied. Additionally, the consequences of adding 1 at.% Cu replacing Ni or Al were studied. The stability of the amorphous structure in melt spun ribbons was thermally studied by di erential scanning...

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Polvos mezclados de aluminio y titanio ( 10 % en peso) han sido aleados mecánicamente en un molino Attritor, obteniéndose una solución metaestable de titanio en la matriz de aluminio. Se han estudiado los cambios producidos en la forma y tamaño de las partículas, estructura y microestructura, al variar el tiempo de molienda entre 2 y 10 h. El...

Porosity is a characteristic present in most sintered materials, full densification only being achieved in special cases. For some sintered materials, porosity is indeed a desired characteristic, serving for the intended application of the material. In any case, the porosity present in materials can have a strong effect on some of their...

La fabricación de núcleos amorfos (tanto para motores eléctricos, como transformadores) es una tarea compleja que hasta ahora ha requerido la fabricación del material amorfo en forma de cintas de fino espesor (mediante enfriamiento muy severo, melt spinning) y su posterior apilado y/o plegado para la formación de la pieza final. El proceso...

The technique of sintering by electrical discharge of capacitors (SEDC) is investigated, using a commercial stud welding equipment adapted to be used in the sintering of amorphous powders. In this technique, pressure and the heat generated by the Joule effect from the high intensity electric current are applied simultaneously to a mass of...

The technique of sintering by electrical discharge of capacitors (SEDC) is investigated, using a commercial stud welding equipment adapted to be used in the sintering of amorphous powders. In this technique, pressure and the heat generated by the Joule effect from the high intensity electric current are applied simultaneously to a mass of...

The fabrication of soft magnetic Fe parts by the medium-frequency electrical resistance sintering (MF-ERS) technique is studied in this paper. This consolidation technique involves the simultaneous application to metallic powders of pressure and heat, the latter coming from the Joule effect of a low-voltage and high-intensity electric current....

El Grupo de Metalurgia e Ingeniería de los Materiales de la Universidad de Sevilla ha desarrollado, durante los últimos quince años, diversas técnicas para la consolidación de aleaciones de aluminio obtenidas por aleado mecánico (AM) de polvos. Las aleaciones, reforzadas por segundas fases precipitadas durante el procesado, han sido prensadas y...

Aluminium powder was mechanically alloyed under ammonia gas flow for different times (1-5 h) in order to produce a second-phase reinforcement, mainly by aluminium nitride (AlN). After milling, powders were consolidated by cold uniaxial pressing and vacuum sintering. A small amount of copper powder was added to the Al milled powder to improve...

Properties of compacts made from aluminium powder, milled under different atmospheres, were evaluated. The duration of all the milling processes was 10 h, although different atmospheres were tested: vacuum, confined ammonia, and vacuum combined with a short-time ammonia gas flow (5 min). Milled powders were consolidated by cold uniaxial...

The influence of the applied pressure and electrical parameters on the macrostructure of specimens consolidated by the medium-frequency electrical resistance sintering technique (MF-ERS) is analysed in this work. This technique is based on the application of pressure to a mass of conductive powder that, simultaneously, is being crossed by a...

Manufacturing metallic materials from elemental or alloyed powders is an option in many industrial processes. Nevertheless, the traditional powder metallurgy processing including furnace sintering is at times detrimental for the microstructure attained in the powders. Alternative sintering processes based on the use of electricity and the...