Pt-modified Ni aluminides, MCrAlY-base multilayer coatings and TBC systems fabricated by Spark Plasma Sintering for the protection of Ni-base superalloys

[摘要] Pt-modified Ni aluminicles and MCrAlY coatings (where M = Ni and/or Co) are widely used on turbine blades and vanes for protection against oxidation and corrosion and as bond coatings in thermal barrier coating (TBC) systems. The present work shows the ability of a new fabrication technique, the Spark Plasma Sintering, to develop rapidly new coating compositions and microstructurres. This technique allows combining powders and metallic foils on a superalloy substrate in order to obtain multilayered coatings in a single short experiment. Fabrication of MCrAlY overlays with local Pt and/or Al enrichment is shown, as well as fabrication of coatings made of xi-PtAl2, epsilon-PtAl, alpha-AlNiPt2, martensitic beta-(Ni,Pt)Al or Pt-rich gamma/gamma' phases. The realization of a complete TBC system with a porous and adherent Yttria Stabilized Zirconia (YSZ) layer on a gamma/gamma' low mass bond coating is also demonstrated. Difficulties of fabrication are reviewed and discussed, such as Y segregation, risks of carburization, local overheating, or difficulty to coat complex shape parts. Finally, some first results of cyclic oxidation are given. (C) 2009 Elsevier B.V. All rights reserved.

[发布日期] 2009-12-25

[效力级别]  Proceedings Paper

[关键词] High temperature coatings;Aluminide;MCrAlY;Spark Plasma Sintering;Oxidation;Corrosion;TBC