Microstructure evolution and oxidation behavior of B modified MoSi 2 coating on Nb-Si based alloys

•Mo–Si–B coating was prepared through depositing Mo followed by Si/B co-deposition.•Microstructural evolution of the coating during the pack cementation is elucidated.•The obtained coating exhibits good oxidation resistance.•The good oxidation resistance is due to the formation of the borosilicate scale.