Produção e caracterização de recobrimentos de ligas Ti-Nb-Mo depositados por pulverização magneto-catódica sobre aço inoxidável

Abstract

With the increase in demand from the health sector for the production of more resistant and quality materials due to the increase in the population's longevity, new studies of implants and prostheses must emerge to meet this market need. Ti-6Al-4V alloys are widely used in this area, however these alloys can release ions with cytotoxic potential to the body. Stainless steels are also commonly used as implants and prosthetics; however, their mechanical properties of modulus of elasticity and hardness can be improved in biomedical applications. One possibility to meet these needs is the use of β-Ti (body-centered cubic – bcc phase) alloys in coatings, as they have high biocompatibility. The β phase can be obtained with the addition of alloying elements such as Nb and Mo. One way of obtaining metallic coatings is by means of the magnetron sputtering technique, which has been used in recent years to process thin films with broad potential for improving the surfaces in the biomaterials field. Therefore, the present study aims to produce Ti-Nb-Mo coatings on a 316L stainless steel substrate, via the magnetron sputtering technique. Mechanical characterizations by nanoindentation and chemical and structural analyses by grazing incidence X-ray diffraction (GIXRD), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRFS), and scanning electron microscopy (SEM) were used to carry out a performance evaluation of the coating.