The problem of insufficient oxidation resistance of a TiAl alloy above 800 °C has limited its broader application. In this paper, Ni/Al composite coatings were deposited on TiAl alloy. The high-temperature oxidation resistance and thermal shock behavior of the Ni/Al coatings were systematically investigated. The composition of the oxidized coating from the surface to the interior consisted of an Al2O3 oxide film, a NiAl compound layer, a Ni layer, a TiAl3 diffusion layer, and a Ti2Al diffusion layer. The Al2O3 oxide film and NiAl compound layer effectively hindered the inward diffusion of oxygen and the outward diffusion of titanium. The local failure of the coating in thermal shock experiments began with the initiation and propagation of pores and cracks.
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