Síntese e caracterização de filmes finos de TiNb sobre o aço AISI 316L para aplicações biomédicas
Abstract
Titanium and its alloys have been widely used in biomedical devices and
components. The commercially pure titanium and Ti-6Al-4V (Ti64) are the
biomaterials most widely used for implants, due to its characteristics regarding
corrosion resistance, biocompatibility and commercial production. However, in
the case of the Ti64 alloy, aluminum and vanadium present problems associated
with cytotoxic effects in tissues and adverse reactions such as Alzheimer's
disease and other neuropathies. The β type Ti alloys used in orthopedic devices
have excellent properties such as low density, high mechanical strength and
outstanding corrosion resistance, besides being biocompatible. The β phase in
Ti alloys is obtained by adding alloy elements such as Nb, Ta, Zr and Mo. The
coatings in form of thin films made by magnetron sputtering - MS have been
successfully employed for the surface treatment of metallic biomaterials for
‘applications in the medical industry, with the advantage that low dimensionality
coating does not alter the structural properties of the prosthesis to be implanted,
thereby allowing improvement of their surface properties and therefore the use in
the human body. A new class of Ti alloys employs niobium as a stabilizer of the
β phase. The Ti-Nb binary alloys are promising candidates for biomedical
applications. Therefore, an interesting option to adjust the surface feature is the
thin film technology. Thus, in this dissertation, nanostructured thin films were
produced by sputtering on the surface of stainless steel AISI 316L, with the
purpose of analyzing the influence of niobium content on the behavior of the films.
The produced films were mechanically, morphologically, crystallographically,
chemically and electrochemically characterized, presenting the Ti-β phase for all
the concentrations along with good mechanical properties and corrosion
resistance for its potential use in the manufacture of medical implantation
devices.