Synthesis of Hf-modified aluminide coatings on Co-base superalloys

►Successful development of Hf-modified aluminide coatings on Co-base alloy coupons. ►Industrial-scale production of Hf-modified aluminide coatings on Co-base alloy turbine engine vane segments. ►Hf-rich phase particles were formed on coating surface and along grain boundaries in the additive layer. ►Effect of heat treatment on Hf-rich precipitated phase particles.