Effect of spraying power on microstructure and bonding strength of MoSi2-based coatings prepared by supersonic plasma spraying

► MoSi2-based oxidation protective coatings were prepared using supersonic plasma spraying. ► Effects of spraying power on microstructure and bonding strength of the coatings were studied. ► The coatings become more and more compact and the bonding strength increases when the spraying power increases from 40 kW to 50 kW. At 50 kW, the coatings were dense and the bonding strength reached a maximum value of 14.5 MPa. However, when the spraying power reaches 55 kW, cracks and pores will reappear in the coatings and the bonding strength also decreases.