Examinando por Materia "SYNERGY"

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    PublicaciónAcceso abierto
    Medición in vitro de la fuerza de fricción en duplas arco-bracket con angulación
    (2014-04-23) Bobadilla-Gaviria, M. (Margarita); Montoya-Goéz, Y. J.(Yesid de Jesús)
    In this work the effect of second order angulation on sliding resistance for orthodontic wire-bracket couples was evaluated. Both the evaluated wires and brackets were made of AISI 316L stainless steel. The tests were performed at angles of 0°, 2°, 4°, 6° and 8°, by means of a universal testing machine at 5 mm/s. The surfaces were evaluated via scanning electron and optical microscopy. The results showed that the frictional resistance increases proportionally to the angulation of the wire, but at the same time, this frictional resistance strongly depended on the geometry of the slot and the Young´s modulus of the bracket and the wire.
  • Miniatura
    PublicaciónAcceso abierto
    Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal
    (2013-11-05) Aperador, W. (William); Bautista, J. H. (Jorge Hernando); Betancur, J. D. (Juan David)
    We obtained austenitic alloys of the Fe-Mn-Al, Fe in the range (4.9~11.0 wt% Al) - (17.49~34.3 wt% Mn) -(0, 43 ~ 1.25 wt% C), which were melted in an induction furnace from high purity materials. The alloys were evaluated with respect to corrosion, wet erosion and corrosion-erosion at an impact angle of 90°. For the evaluation of corrosion a solution composed of 0.5 M NaCl and silica particles with size between 210 to 300 microns was used in order to analyze the effect of aluminum and manganese content in the resistance to erosion and corrosion-erosion of these alloys. To characterize the corrosion, response technique was used by potentiodynamic polarization curves and using the same technique as Tafel extrapolation, the microstructural characterization by scanning electron microscopy (SEM), and the composition of corrosion products were analyzed using diffraction of X-rays (XRD).