Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Tribocorrosion Properties of Titanium Alloy Modified By Electrical Discharge Machining
Submission Author:
Leticia Bemben , PR
Co-Authors:
Bruna Michelle de Freitas, Carlos augusto Henning Laurindo, Paulo Soares, Leticia Bemben
Presenter: Leticia Bemben
doi://10.26678/ABCM.COBEM2017.COB17-1989
Abstract
Titanium and its alloys are widely used in the biomedical field, especially in orthopedic implants due to its biocompatibility, good mechanical properties and corrosion resistance. However they do not exhibit good performance when submitted to tribocorrosion conditions (simultaneous action of wear and corrosion). Electrical Discharge Machining (EDM) is a non-conventional machining process where a desired shape is obtained by using electrical discharges (sparks) that promotes the material removal. Depending on the machining parameters and electrolyte, EDM can also be used to improve surface properties. The aim of this work was to investigate the tribocorrosion behavior in titanium alloy surfaces (Ti6Al4V), modified in different conditions. The samples were machined using different dielectric fluids rich in carbon with different times of electrical discharges. The new surfaces were characterized in relation to roughness, morphology, chemical composition, and tribocorrosion to assess wear rate, coefficient of friction and corrosion potential. The best results were obtained for samples milled using conventional EDM fluid as dielectric fluid, because it formed a surface rich in carbon containing TiC, increasing its resistance to wear. Samples machined with diluted glycerin in water as a dielectric fluid showed no major improvement over the titanium alloy (Ti6Al4V) without surface modification.
Keywords
Titanium alloys, EDM, Tribocorrosion
