Comparison of in-situ oxidation behavior of Zr by micro-arc oxidation and selective laser melting

Al2O3-ZrO2 ceramic coatings were prepared on 6061 Al alloy by Micro Arc Oxidation (MAO) and Selective Laser Melting (SLM). Coatings MAO exhibit a porous structure progressive oxidation of the substrate as function processing time. Those made SLM are denser, although presence cracks is observed throughout their surface. XRD results suggest that coating consists m-ZrO2, t-ZrO2 γ-Al2O3 phases for process, while Zr3O phase also present in SLM. The hardness higher than obtained Young’s modulus lower, due to level porosity MAO. Moreover, in-situ oxidation, heating solidification processes all discussed compared within context peculiarities. transformation mechanisms involved methods produce diverse microstructures.