Examinando por Materia "Dureza"

Mostrando 1 - 2 de 2
  • No hay miniatura disponible
    Ítem
    Escamas de pescado: una referencia para construir mejores materiales
    (2021-04-05) Martinez Guerrero, Christian Alexander; Christian Alexander Martinez-Guerrero; Jiang, H.; Ghods, S.; Weller, E; Ossa, E.A.; Yang, F; Arola, D.; Vicerrectoría de Descubrimiento y Creación
  • No hay miniatura disponible
    Ítem
    Síntesis y caracterización de películas delgadas de Reb2 en Co-deposición con Ti mediante la técnica Magentrón Sputtering
    (Universidad EAFIT, 2023) Ruiz Daza, Carolina Rocío; Arroyave Franco, Mauricio; Palacio Espinosa, Claudia Constanza
    Using the reactive magnetron sputtering technique, Rhenium Boride films in co-deposition with Titanium were grown on steel substrates at 100°C. To improve the adhesion of the coating a stack of twelve Ti/TiN bilayers was grown using a reactive atmosphere of argon and nitrogen with a ratio Ar/N2=40/1.4 sccm meanwhile, radio frequency power, negative bias voltage, working pressure, and temperature of 100°C were fixed in the experiments to produce the (ReB2):Ti. A design of experiments with a fraction-factorial style was made with four inputs and two outputs with 3 different levels. A matrix of procedures was defined for a total of 9 experiments. The titanium target was powered with 30 and 60 watts during the co-deposition with ReB2 to evaluate the content of titanium at different ratios. Structural and compositional measurements were carried out using SEM, XRD, and XPS to confirm the formation of (ReB2):Ti and AFM analysis to measure the thickness and observe the morphology of samples. Furthermore, mechanical properties were measured with nano hardness equipment, showing that the addition of titanium to ReB2 coating has a significant improvement on the chemical stability of ReB2 on steel and preserves mechanical properties of hardness and high Young’s module, which makes the material suitable for applications in the mechanical industry reaching hardness around 20 GPa.