F. Romero

Polytechnical University of Valencia, Valenza, Valencia, Spain

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Publications (6)1.95 Total impact

  • Revista De Metalurgia - REV METALURGIA. 01/2007; 43(6).
  • Materials Science Forum - MATER SCI FORUM. 01/2007;
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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.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.
    Revista de Metalurgia. 01/2007;
  • Materials Science Forum - MATER SCI FORUM. 01/2007;
  • Source
    Boletín de la Sociedad Española de Cerámica y Vidrio, ISSN 0366-3175, Vol. 43, Nº. 2, 2004 (Ejemplar dedicado a: VII Reunión Nacional de Materiales), pags. 573-577. 01/2004;
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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.
    Journal of Materials Processing Technology 01/2003; 141(1):117-122. · 1.95 Impact Factor