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In this study, the surface of AA2024-T4 Al alloy substrate was coated by Al 2 O 3  + TiO 2  powders without and with NiAl bond coat by using a plasma spray process. The TiO 2  content was added at different concentrations (3, 13 and 40 wt.-%) to the Al 2 O 3  content. The coated samples were characterized by means of an optical microscope, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and the hardness as well as the bond strength were tested. These results showed that the hardness and porosity decreased with the increasing of the TiO 2  content of the Al 2 O 3  + TiO 2  coatings. The bonding strength of the coated specimens was increased by using the NiAl bond coat.

Plasma Spray Coating of an AA 2024-T4 Al Alloy with Oxide Powders