F. Romero

University of Valencia, Valenza, Valencia, Spain

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Publications (7)2.52 Total impact

  • V. Amigó · F. Romero · M. D. Salvador · D. Busquets
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    ABSTRACT: The high reactivity of titanium and the facility of the same one to form intermetallics makes difficult obtaining composites with this material and brings the need in any case of covering the principal fibres used as reinforcement. To obtain composites of titanium reinforced with ceramic particles is proposed in this paper, and for this reason it turns out to be fundamental to evaluate the reactivity between the matrix and reinforcement. Both titanium nitride and carbide (TiN and TiC) are investigated as materials of low reactivity whereas titanium silicide (TiSi2) is also studied as materials of major reactivity, already stated by the scientific community. This reactivity will be analyzed by means of scanning electron microscopy (SEM) there being obtained distribution maps of the elements that allow to establish the possible influence of the sintering temperature and time. Hereby the matrix-reinforcement interactions are optimized to obtain suitable mechanical properties.
    No preview · Article · Nov 2007 · Revista de Metalurgia

  • No preview · Article · Jan 2007 · Materials Science Forum

  • No preview · Article · Jan 2007 · Materials Science Forum
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    V. Amigó · F. Romero · M. D. Salvador · D. Busquets
    [Show abstract] [Hide abstract]
    ABSTRACT: The high reactivity of titanium and the facility of the same one to form intermetallics makes difficult obtaining composites with this material and brings the need in any case of covering the principal fibres used as reinforcement. To obtain composites of titanium reinforced with ceramic particles is proposed in this paper, and for this reason it turns out to be fundamental to evaluate the reactivity between the matrix and reinforcement. Both titanium nitride and carbide (TiN and TiC) are investigated as materials of low reactivity whereas titanium silicide (TiSi2) is also studied as materials of major reactivity, already stated by the scientific community. This reactivity will be analyzed by means of scanning electron microscopy (SEM) there being obtained distribution maps of the elements that allow to establish the possible influence of the sintering temperature and time. Hereby the matrix-reinforcement interactions are optimized to obtain suitable mechanical properties.La elevada reactividad del titanio y la facilidad del mismo en formar intermetálicos dificulta la obtención de compuestos con este material y la necesidad, en todo caso, de recurrir al recubrimiento de las principales fibras utilizadas como refuerzo. Se propone obtener compuestos de titanio reforzados con partículas cerámicas y, por ello, resulta fundamental evaluar la reactividad entre los diferentes materiales. Se investiga como materiales de baja reactividad el nitruro y carburo de titanio y como materiales de mayor reactividad, ya constatada por la comunidad científica, el TiSi2. Esta reactividad se analizará mediante microscopía electrónica de barrido obteniéndose mapas de distribución de los elementos, que permiten establecer la posible influencia de la temperatura de sinterización y el tiempo de permanencia a éstas. De esta manera, se optimiza en lo posible las interacciones matriz-refuerzo para obtener unas propiedades mecánicas adecuadas.
    Full-text · Article · Jan 2007
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    ABSTRACT: In this paper we explain the influences of differents temperatures in the sintering of titanium matrix composites reinforced be ceramics particles. There are very differents studies about titanium and titanium matrix composites and their use in powder metallurgy technology, because this technology is used more and more nowadays in aerospace, biotechnology, sports and fashion industries. TiAl and TiB2 powder are milled with Ti powder in differents percentages about 10-40% in a balls mill. This mixture are pressed in a uniaxial press and sintered in a vacuum furnace at differents temperatures between 1180 to 1300°C. Samples porosity are studied, before and after the sintering process. Mechanical properties and the addition particles influence in the titanium matrix are studied by flexion test in green and sintering states, and by hardness and microhardness tests. Complementary, microstructure are observed by optical and electron microscopy, and the reactivity between the reinforce particles and titanium matrix are studied.
    No preview · Article · Jan 2005
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    Full-text · Article · Jan 2004
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    ABSTRACT: The sintering of microspheres for porous coating is made in titanium alloys at temperatures close to 1400°C, thus substantially modifying the microstructure of the bases alloy. This changes is fundamentally due to grain size enlargement and α+β Widmanstaetten structure.Therefore it is necessary to make a deep study of grain growth effect on the hardness of the base material and the component of the sintered balls, in order to evaluate mechanical properties variation due to changes in the microstructure.There are also important complementary stabilization treatments of the microstructure by means of controlled cooling at high speeds it avoids the formation of β phases in grain boundaries, at the same time that avoid the broken-up of the Widmanstaetten structure, developing in an increase in mechanical resistance and fatigue resistance of the prosthesis.
    No preview · Article · Oct 2003 · Journal of Materials Processing Technology