Examinando por Autor "Valencia-García, M. F. (Marco Fidel)"

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  • Miniatura
    PublicaciónAcceso abierto
    Producción y caracterización de partículas y fibras cortas de β-Sic obtenidas a partir de cáscara de arroz
    (2014-05-07) Valencia-García, M. F. (Marco Fidel); Martínez, H. V. (Háder Vladimir); Chejne, F. (Farid); Cruz-Riaño, L. J. (Luis Javier)
    The use of the rice hull is minimal in most of the Latin American countries and only a small portion is used as fertilizer or fuel. However, products of rice hull obtained by pyrolysis can be useful for abrasive and refractory products based on silicon carbide (SiC). Recently some applications have been developed to use SiC as reinforcement for metallic alloys for metal matrix composites. This paper reports the synthesis of short fibers and small particles of SiC obtained by controlled combustion of rice hull. The SiC synthesis was performed in a gas furnace, designed during the research. This process was optimized by an experimental design which included as variables the temperature, pyrolysis time, the type of catalyst, and process atmosphere.
  • Miniatura
    PublicaciónAcceso abierto
    Síntesis y caracterización de un polímero biodegradable a partir del almidón de yuca
    (2014-05-08) Meneses, J. (Juliana); Corrales, C. M. (Catalina María); Valencia-García, M. F. (Marco Fidel)
    In the present research a biodegradable polymer was elaborated from manioc starch, based on the Taguchi methodology as the experiment design tool. The sweet manioc starch was mixed with chemical reagents acting as plastifiers, extensors, thickeners, lubricants, moisturizers, and mold releasing agents, varying the experimental conditions as indicated by the experiment design. The different mixtures underwent several processes common to conventional polymers in an open mill, an injection machine, and a vulcanizing press. The experimental process gave as a result six polymeric samples of adequate characteristics, all of which were subjected to physical, chemical, and mechanical properties and biodegradation measurement.
  • Miniatura
    PublicaciónAcceso abierto
    Uso de lodos provenientes de la industria papelera en la elaboración de paneles prefabricados para la construcción
    (2014-05-08) Quinchía-Figueroa, A. M. (Adriana María); Valencia-García, M. F. (Marco Fidel); Giraldo-Orozco, J. M. (Jorge Mario)
    This work was based on the fabrication of drywalls as nonstructural elements for the construction industry, from the beneficial of the residual sludge from the treatment of waters served as the paper industry. The optimal mixtures, the suitable materials, and the stages of the process of fabrication of the panels to develop pieces were defined that fulfill the standards of resistance required and the technical norms associated to this kind of products. In this form not only new options of materials in the region are offered, but also offers an enormous environmental benefit from the assessment of an industrial waste assessment generated in great quantities.