Abstracts Book - IMRC 2018

• SE2-O031
RESISTANCE TO WEAR AT HIGH TEMPERATURES OF ZIRCONIA-
ALUMINA-CERIA COATINGS ACHIEVED BY THERMAL FLAME
SPRAYING
Luis Francisco Rodriguez Wilches 1,2 , Martha Yasmid Ferrer Pacheco 2 , Fabio Vargas Galvis 3
1 Colegio Santo Angel de la Guarda, Cucuta, Colombia. 2 Universidad Francisco de Paula
Santander, Norte de Santander, Colombia. 3 Universidad de Antioquía, Antioquia, Colombia.
The coatings for thermal spray are used as a means of protecting structures
subjected to aggressive temperature and/or waste environments. The materials
commonly used are metallic, ceramic and composite, some with high melting
points. It is therefore necessary to employ a powerful heat source to melt them,
such as the plasma of an inert gas. However it is possible to obtain the energy a
oxy-acetylene flame by carefully varying the relationship between oxygen and
acetylene gases. This engenders an economic and efficient result. Zirconiaaluminium-ceria
coatings were developed using thermal spray by oxy-acetylene
flame on ceramic substrates were procured as a means of improving its
mechanical properties in terms of hardness and resistance to wear when they
are subjected to high temperatures The following are the nanometric and
commercial powders used: MetaCeram 25088 (ZrO 2 –36% by weight of Al 2 O 3 )
and ceria (CeO 2 ). They were blended and baked into three different
compositions: C1, C2 and C3, increasing the concentration by weight of ceria.
The substrates used were red clay tiles. The spray parameters are obtained the
results of a numeric simulation using the software specialized for this technique,
known as jets and Poudres. The morphology and microstructure of both the
powders and the coatings were determined by Scanning Electron Microscopy
SEM and X-ray diffraction (XRD) respectively. The micro-hardness was measured
by the Vickers microindentation test and the resistance to wear, with a
tribometer at a high temperature in the ball-on-disk configuration. The results
show that the mechanical properties depend on the phases present in the
coatings and that wear is related to the percentage of ceria, essentially,
encountering a greater measure of waste in the coating that has a greater
concentration of ceria.
Keywords: Zirconia-aluminium-ceria coatings, thermal spray by flame, resistance to
wear at high temperatures
Presenting authors email: luisfranciscorw@ufps.edu.co