EVALUACIÓN DE LA DUREZA MEDIANTE ENSAYOS DE PERFORACIÓN CON TALADRO AUTOMATIZADO EN RECUBRIMIENTOS DE Al2O3-TiO2 ELABORADOS POR PROYECCIÓN TÉRMICA OXIACETILÉNICA

María Angélica Barreto Lance; Fabio Vargas Galvis

doi:10.17533/udea.rcm.n21a03

Authors

María Angélica Barreto Lance Universidad de Antioquia
Fabio Vargas Galvis Universidad de Antioquia

DOI:

https://doi.org/10.17533/udea.rcm.n21a03

Keywords:

proyección térmica oxiacetilénica, dureza, resistencia a la perforación, recubrimientos

Abstract

In this work, the hardness of alumina coatings with 13 wt.% and 43 wt.% titania, thermally sprayed by oxy-acetylene flame was measured using an automated drilling system. Indentations was produced on the surface of each coating, applying loads by steps of around 20 N to ~140 N, using a tungsten carbide-cobalt drill bit. Subsequently, the load was progressively withdrawn in steps of ~20 N until the applied force was completely discharged. During each step of loading and unloading of the applied force, the depth of the drill bit with respect to the surface of the coating was measured, and then, the hysteresis curve (force load/unload vs. penetration depth) was constructed and from this data the drilling hardness was calculated. The drilling hardness was calculated from equations proposed previously by others researchers for ceramic coatings thermally sprayed using an atmospheric plasma jet. The results demonstrated that this method is useful to measure the hardness of ceramic coatings thermally sprayed with oxy-acetylene flame, supplementing the findings of other researchers who had carried out similar studies on ceramic coatings thermally sprayed by atmospheric plasma jet.

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