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Thermal barrier systems and multi-layered coatings fabricated by spark plasma sintering for the protection of Ni-base superalloys

Monceau, Daniel and Oquab, Djar and Estournès, Claude and Boidot, Mathieu and Selezneff, Serge and Ratel-Ramond, Nicolas Thermal barrier systems and multi-layered coatings fabricated by spark plasma sintering for the protection of Ni-base superalloys. (2010) Materials Science Forum, vol. 654-656 . pp. 1826-1831. ISSN 0255-5476

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.654-656.1826

Abstract

Aeronautic gas turbine blades, vanes and combustion chambers are protected against high temperature oxidation and corrosion by single or multilayered coatings. These include environmental coatings, generally based on Pt-modified Ni aluminides or MCrAlY overlays (where M = Ni and/or Co), thermal barrier coating (TBC) systems including a ceramic thermally insulating layer, and abradable seals. The present work shows the ability of the Spark Plasma Sintering technique to rapidly develop new coatings compositions and microstructures. This technique allows combining powders and metallic foils on a superalloy substrate in order to obtain multilayered coatings in a single short production step. Fabrication of MCrAlY overlays with local Pt and/or Al enrichments is shown, as well as fabrication of coatings made of z-PtAl2, e-PtAl, α-AlNiPt2, martensitic and b−(Ni,Pt)Al or Pt-rich g/g’ phases, including their doping with reactive elements. The fabrication of a complete TBC system with a porous and adherent Yttria Stabilized Zirconia (YSZ) layer on a bond-coating is also demonstrated, as well as the fabrication of a CoNiCrAlY-based cermet coating for abradable seal application. Difficulties of fabrication are reviewed, such as Y segregation, risks of carburization, local over-heating, or difficulty to coat complex shaped parts. Solutions are given to overcome these difficulties.

Item Type:Article
Additional Information:Thanks to Trans Tech Publications editor. The definitive version is available at http://www.ttp.net The original PDF of the article can be found at Materials Science Forum website : http://www.scientific.net/MSF.654-656.1826
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Leila Abdelouhab
Deposited On:21 Jun 2011 09:09

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