Comparison of Thermal Cyclic Oxidation of the PVD Ni-Al and HVOF-MCrAlY Coatings

摘要

Thermal Sprayed-YSZ/MCrAlY TBC systems are the currently used technology to the high-temperature enhancement of turbine blades and combustion chambers in nowadays turbine engines and power generation industries. Since the long service life of EB-PVD TBCs have been proved, and on the other hand, the CVD (Pt, Ni)Al bondcoat also have shown their higher high-temperature oxidation resistance and more adherent on substrate, the development of whole PVDYSZ/bondcoat in a single cycle coating run is attractive. A PVD process - Cathodic arc plasma ion plating was used to deposited Ni-Al films on Inconel 600 substrate. The oxidation behavior of PVD Ni-Al coating and the thermal sprayed CoCrAlY coatings were revealed and compared in 1100 deg C cyclic thermal oxidation test Experimental results show that films with different composition Ni_(62)Al_(38), Ni_(63)Al_(37) and Ni(69)Al_(31) could be obtained when using Ni_(52)Al_(48), Ni_(60)Al_(40) and Ni_(70)Al_(30) target, respectively. During the 1100 deg C cyclic thermal oxidation test, the aluminum-rich Ni-Al films were beneficial to form an Al_2O_3 layer on the surface and stop oxidation rapidly and caused the lower oxidation mass change than CoCrAlY coating.