Abstract:
Mo
2NiB
2-based cermet coating was prepared on the surface of Q235 steel substrate by atmospheric plasma spraying, and the effect of powder feeding rate (40-80 g·min
-1) on the hardness, bonding strength and corrosion resistance of Mo
2NiB
2 coating was studied. The results show that the Mo
2NiB
2 coating was mainly composed of Mo
2NiB
2 ceramic phase, MoNi
4 alloy phase and MoB
2 hard phase under different powder feeding rates, and the coating quality was the best when the powder feeding rate was 60 g·min
-1. With increasing powder feeding rate, the hardness and bonding strength of Mo
2NiB
2 coating increased first and then decreased and both reached the maximum values when the powder feeding rate was 60 g·min
-1, which were 2 107 HV and 29.23 MPa, respectively. The corrosion resistance of Mo
2NiB
2 coating increased with increasing powder feeding rate, and reached the best level when the powder feeding rate was 80 g·min
-1.