The influence of the spraying parameters on the microstructure of ZrO2 – 36 wt.% Al2O3 y ZrO2 – 17wt.% CeO2 coatings was evaluated. The coatings were produced by oxyacetylene flame spraying on substrates of AISI 1020 carbon steel, which had a previous deposited bond coat of 90 wt.% Ni – 5 wt.% Al – 5 wt.% Mo. The studied variables were the standoff distance between the torch and the substrate (7.5, 10 and 12.5 cm) and the influence of two commercial powders: Eutectic Castolin® and Saint Gobain®. It was established that the internal morphology of the powders has a high influence on the microstructure of the coatings while, the spraying distance has a great influence on the microhardness and the porosity of the obtained zirconia-alumina and zirconia-ceria coatings.