Recobrimento de aço inoxidável ABNT 409 empregando filme fino bioativo obtido via sol-gel

AUTOR(ES)

Sonia Regina Federman

DATA DE PUBLICAÇÃO

2007

RESUMO

In the present study, composites made up of ABNT 409 stainless steel was obtained where films produced according to the sol-gel route were deposited using the immersion method. A film of the binary system SiO2-CaO, and another one of the ternary system SiO2-CaOP2O5, were employed. The structure and properties of these films were characterized through the scanning electron microscopy (SEM) technique, coupled with the energy dispersive spectroscopy, atomic force microscopy, Fourier Transformed Infrared spectroscopy (FTIR), Raman spectroscopy, and glow discharge optical emission spectroscopy and thermal analysis. The use of these techniques revealed the formation of a homogeneous sol-gel film, which adhere to the substrate (degree of 0 in the tape test) with no indication of cracks nor pores. After the film densification stage, AFM images showed the presence of calcium nitrate protuberances on the surface of the films. These protuberances made it possible to design the surface area of the film simply by manipulating easily accessed parameters, such as the temperature and duration of the film drying stage. The variation in temperature and duration of the thermal treatment made it possible to obtain surfaces presenting innumerous protuberances as well as surfaces exempt from such protuberances. Since one of the key aims of this work is the utilization of these coatings in the clinical area, the biocompatibility of the films was accessed through two methods: one method using a solution simulated to corporeal fluids and another using cell culture tests. The method using the corporeal solution suggested biocompatibility through the recipitation of a hydroxyapatite precursor (monocalcium phosphate) on the surface of the films. The method of cell cultures also proved the biocompatibility of the films as no toxic effects were detected in any of the samples analyzed. Another important finding was the cell viability index of the sol-gel films, which ranged from 90% to 100%, in comparison with that of the control used.

ASSUNTO(S)

engenharia de minas teses. engenharia metalúrgica teses.

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