Wear behavior of HVOF-sprayed CoCrAlYTaCSi coating at elevated temperature up to 1000 ℃

As a kind of representative metal-based protective coating,MCrAlY (M is Nickel, cobalt, or a combination of the two) alloy coatings are of special significance in preventing the hot parts such as rotary and static blades of turbine from hot corrosion and high temperature oxidation. Usually, high velocity oxy-fuel (HVOF) spraying technology is applicable to preparing MCrAlY coatings that are sensitive to oxidation, because HVOF spraying works well at low flame temperature, low dwell time and high flame velocity thereby providing as-sprayed coatings with low porosity, good adhesion to substrate and desired microstructure.

Agglomerated and sintered CoCrAlYTaCSiAAl₂O₃ powder wasused to prepare MMC coating by HVOF spraying. Spherical CoCrAlTaCSiAAl₂O₃ powder fabricated by agglomerating and sintering technology is suitable for depositing MMC coating on Ni-based alloy substrate by HVOF spraying.As-sprayed CoCrAlYTaCSiAAl₂O₃ coating exhibits a dense microstructure and contains homogenously distributed Al₂O₃ particles with a size of several micrometers. HVOF-sprayed CoCrAlYTaCSiAAl₂O₃ coating exhibits enhanced mechanical properties as well as good oxidation resistance and wear resistance at elevated temperatures up to 1000℃, showing promising potential as the protective coating of Ni-based alloy hot parts. 

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