The effect of a sputtered NiCrMoNb alloy coating on the oxidation resista nce of the intermetallic compound Ti Al was investigated.The bare TiAl alloy exhibited poor ox idation resistance at 1223K due to th e formation of a TiO 2 -base scale which tended to spall off.The NiCrMoNb alloy coating greatly impr oved the oxidation resistance due to the formation of an adherent,dense,and fine-grained Al 2 O 3 -rich scale.Furthermore,inter-diffusion of Ni,Cr,Mo,Nb was observed betwe en the coating and substrate.