Federico Sequeda

Propiedades mecánicas de Recubrimientos de Ti-Si-N sintetizado por pulverización catódica reactiva

Ti-Si-N coatings were deposited by DC reactive magnetron sputtering on stainless steel AISI 304 substrates varying the N2 flow, in order to study the effect on the structural, mechanical and tribological properties. The coatings were deposited using a 99.999 % purity Ti-Si (90-10 at.%) target. Structural characterization was performed by X-ray diffraction (XRD), observing peaks corresponding to crystalline TiN. As there is no evidence of the formation of the Ti-Si-N , Ti-Si, Ti or Si free phases, it was determined that the compound consists of TiN crystal grains in an amorphous matrix of SiN. This result is supported by FTIR and EDS analysis. The mechanical properties were studied by nanoindentation, obtaining hardness values of approximately 23 GPa when low N2 flows were used.

Análisis de corrosión y tribológico de capas delgadas metálicas de Ti y aleación titanio – circonio depositadas por DC magnetrón sputtering no reactivo sobre acero inoxidable de aplicación médica

Titanium (Ti) and titanium-zirconium (Ti-Zr) allow thin films were deposited on AISI 304 stainless steel substrates by non reactive PVD-DC Magnetron Sputtering technique in argon environment, using Ti 99,99% and Ti-Zr (70/30) targets. Corrosion and tribological measurements were performed. From the Potentiodynamic the corrosion and pitting potential for the substrates and thin films were obtained. Using NaCl 3,5% p/p electrolytic solution, a Hg/KCl electrode saturated at 37°C temperature (human corporal temperature). Results obtained shows that thin films increases pitting potential enhancing life time of the substrates. Through Ball on Disc system, coefficient of friction (COF) and wear rate were calculated for AISI 304, Ti and Ti-30Zr, presenting metallic tribological behavior. Morphological analysis of the wear track and corrosion pitting shape were performed by optical microscopy.