Serge Selezneff
Snecma
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Publication
Featured researches published by Serge Selezneff.
Materials Science Forum | 2010
Daniel Monceau; Djar Oquab; Claude Estournès; Mathieu Boidot; Serge Selezneff; Nicolas Ratel-Ramond
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 -PtAl2, -PtAl, α-AlNiPt2, martensitic and (Ni,Pt)Al or Pt-rich ’ 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.
Materials Science Forum | 2012
Claude Estournès; Djar Oquab; Serge Selezneff; Mathieu Boidot; Daniel Monceau; D. Grossin; Christophe Drouet; U. Chan Chung; F. Roulland; Cathy Elissalde; Mario Maglione; Rachman Chaim; Philippe Miele; J. Gurt-Santanach; Geoffroy Chevallier; Alicia Weibel; Alain Peigney; Ch. Laurent
In the field of advanced ceramics, Spark Plasma Sintering (SPS) is known to be very efficient for superfast and full densification of ceramic nanopowders. This property is attributed to the simultaneous application of high density dc pulsed current and load, even though the sintering mechanisms involved remain unclear. In the first part of the paper, the mechanisms involved during SPS of two insulating oxide nanopowders (Al2O3 and Y2O3) are discussed while in the second part illustrations of the potential of SPS will be given for (i) Consolidation of mesoporous or unstable nanomaterials like SBA-15 or biomimetic apatite, respectively; (ii) Densification of core (BT or BST)/shell (SiO2 or Al2O3) nanoparticles with limited or controlled reaction at the interface. (iii) In-situ preparation of surface-tailored Fe–FeAl2O4–Al2O3 nanocomposites, and finally (iv) One-step preparation of multilayer materials like a complete thermal barrier system on single crystal Ni-based superalloy.
Key Engineering Materials | 2014
Yann Duramou; Rodolphe Bolot; Jean Louis Seichepine; Yoann Danlos; Pierre Bertrand; Ghislain Montavon; Serge Selezneff
Abradable coatings are widely used within aeroengines. These materials are applied onto the inner surface of compressor and turbine shroud sections using thermal spray processes, coating the periphery of the blade rotation path. The functionality of an abradable seal is to wear preferentially when rotating blades come into contact with it, while minimizing the over-tip clearance, and improving the overall efficiency of the engine. This study is concerned with the relationships between the microstructure and mechanical properties of atmospheric plasma sprayed AlSi-Polyester composite coatings.
Key Engineering Materials | 2014
Delphine Aussavy; Rodolphe Bolot; François Peyraut; Ghislain Montavon; Serge Selezneff
This study concerns the mechanical properties of CoNiCrAlY-BN-Polyester composite coatings elaborated by Atmospheric Plasma Spray (APS) and used as abradable seals in the aeronautic industry. The objective is to determine the influence of the diameter of the plasma torch on the coating micrograph morphologies and on the resulting coating thermal and mechanical effective properties. The thermo-mechanical effective properties were then estimated by Finite Element modelling (thanks to the multipurpose finite element software ANSYS) based on coating microstructures captured by Scanning Electron Microscopy (SEM) and Optical Microscopy (OM)
Surface & Coatings Technology | 2009
Daniel Monceau; Djar Oquab; Claude Estournès; Mathieu Boidot; Serge Selezneff; Yannick Thébault; Yannick Cadoret
Surface & Coatings Technology | 2010
Mathieu Boidot; Serge Selezneff; Daniel Monceau; Djar Oquab; Claude Estournès
Surface & Coatings Technology | 2011
Serge Selezneff; Mathieu Boidot; J. Hugot; Djar Oquab; Claude Estournès; Daniel Monceau
Acta Materialia | 2016
Vladimir A. Esin; Vincent Maurel; Paul Breton; Alain Köster; Serge Selezneff
Oxidation of Metals | 2014
Pauline Audigié; Serge Selezneff; Aurélie Rouaix-Vande Put; Claude Estournès; Sarah Hamadi; Daniel Monceau
Archive | 2016
Thierry Sacy; Bec Patrice Le; Biez Philippe Le; Serge Selezneff; Franck Bernard Léon Varin; Michel Lenfant; Fabrice Marsaleix; Dufour Jacques Chazal