Maryory Astrid Gómez Botero

Evaluación de materiales con aplicaciones electronicas, bajo ensayos acelerados de corrosión

In this paper the corrosion behavior of different materials employed in the electronic industry was evaluated. Al, Cu, Ni thin films and Cu/Au bilayer were deposited on mica substrates by mean of physical vapor deposition. The films were tested both connected and as individual parts by means of accelerate corrosion tests in climatic chamber, under NOx and SO2 atmosphere. The samples were characterized by mean of optical microscopy, STM, AFM, XPS, SEM and EDS. Besides, the roughness was determined. The deposit performance was as follows in order, Au/Cu bilayer> Ni > Al > Cu.

Evaluación del efecto de sulfatos y cloruros sobre estructuras de mampostería en cerámica roja.

En este trabajo se realizaron ensayos acelerados de inmersion alterna, con concentraciones de cloruros y sulfatos tipicas de las atmosferas rural, urbana y marino-industrial. Bajo estas condiciones se evaluaron muretes protegidos con hidrofugos comerciales. A lo largo de seis meses de exposicion se realizaron medidas de potencial de circuito abierto. Ademas se realizaron pruebas de resistencia mecanica, analisis de microscopia optica, SEM/EDS, DRX, FTIR, y espectroscopia Mossbauer; una vez finalizado el ensayo. Se encontro deterioro estetico causado por microorganismos biologicos. El material del ladrillo presento muy baja reactividad frente a los agentes contaminantes

Propiedades tribológicas y mecánicas de recubrimientos de craln depositados mediante evaporación por arco catódico.

CrAlN coatings are a good candidate as an alternative to conventional CrN coatings. In this work, CrAlN coatings were deposited on steel substrates by means of cathodic arc evaporation, at negative substrate bias between -50 and -400 V. Friction coefficients showed values around 0.60 and coatings wear rates were very low in the scale of 10 -16 m 3 /Nm, while the counterparts showed an important wear. Hardness values of coatings were extremely high 35 - 40 GPa.