Abstracts Book - IMRC 2018

• SA5-O009
MECHANICAL NANO-CHARACTERIZATION OF AL AND AL-SI
COATINGS DEPOSITED BY CVD-FBR ON AUSTENITIC STAINLESS
STEEL AISI 316 AND STEAM OXIDATION
Diego Pérez Muñoz 1 , José Luddey Marulanda Arévalo 1 , Jose Luis Tristancho Reyes 1 , María
Paulina Holguín Patiño 1 , Diego Alejandro Ramírez Cardona 1
1
Universidad Tecnológica de Pereira, Mechanical Engineering Faculty, Colombia.
Aluminum and Aluminum-Silicon coatings were deposited at 540 °C on the
austenitic stainless steel AISI 316 by chemical vapor deposition in fluidized bed
reactor (FBR-CVD), subsequently were thermally treated at 750 °C with argon
during 2 hours. The coating samples were oxidized in water steam loop at 750
°C, which showed a reduction of corrosion rate in steam at high temperatures
of more than 100 times with respect to the substrate tested under same
conditions. The coating mechanical characterization was conducted by mean of
microhardness and nano-indentation, in order to know how affected the coating
and the substrate’s mechanical properties (particularly the hardness and
Young’s modulus) after being subjected to oxidation at high temperature. Some
analysis were also made by mean of SEM, to observe the micro structural
changes and to see how is the AFM topography and roughness gradient
variation, associated with the distance traveled by the tip of the cantilever during
the sweeps. A potential difference was found between the tip and the sample
surface, where the highest peaks coincide with the highest hardness zones.
Acknowledgment:
Universidad Tecnológica de Pereira. Universidad Complutense de Madrid.
Universidad Nacional de Colombia. Tecnoparque Nodo Pereira, SENA,
Colombia.
Keywords: CVD-FBR, NANO-INDENTATION, ALUMINUM-SILICON COATINGS
Presenting authors email: dperez@utp.edu.co