Page 291 - 00. Complete Version - Progress Report IPEN 2014-2016

Materials and Nanotechnology | Progress Report 291

tal hip prostheses. for the marking did not induce a decrease in
the cellular viability of the samples, as no cy-
Laser bean marking applied totoxicity was showed even after prolonged
to orthopedic implant incubation. The studied biomaterial was ad-
equate on the biomechanical tests, since the
laser treatments, under the conditions used,
did not induce the formation of surface ten-
sions of magnitude capable of leading the fa-
tigue fracture, indicating infinite fatigue life;
the region of fracture by tension could not be
related to the laser marking (Figure 6c). The
wear volume decreased as a function of the
increase in micro hardness produced by the
increase of the pulse frequency in the textur-
ing. The visual character of the markings and
texturing was assured after the majority of
the tests performed.

Figure 5: Topography of (a) untreated and
(b) textured laser biomaterials

Laser beam marking is used to ensure the iden-
tification and traceability of biomaterials. The
texturing imparts greater adhesion to the sur-
faces of implantable medical devices. The treat-
ments performed altered the roughness of the
biomaterials as a function of the increase of
the pulse frequency (Figure 5)

The microstructure and chemical composition
of the surfaces underwent changes that direct-
ly affected the passive layer of the stainless
steels, favoring the triggering of the corrosion
Figure 6: (a) Regions of the sample-4 analyzed by points and by
process. This effect was evidenced by SVET, XPS line, respectively. The arrow indicates the direction adopted for
and the characterization of electronic proper- the analysis by “line scan”- No attack, (b) On-line mapping of the
distribution of the chemical elements present on the sample sur-
ties of the passive film. The parameters used face-4, (c) Marked and standard fractured tensile specimens.