Braue, Wolfgang

Eils, Nadine K.

Hackemann, Stefan

Mechnich, Peter

Naraparaju, Ravisankar

English

Engineering Conferences International

Engineering Conferences InternationalECI Digital ArchivesThermal Barrier Coatings IV ProceedingsSummer 6-25-2014Yttrium oxide a candidate material forenvironmental and thermal barrier coatingsPeter MechnichGerman Aerospace Center (DLR), Institute of Materials Research Cologne, Germany, peter.mechnich@dlr.deWolfgang BraueGerman Aerospace Center (DLR), Institute of Materials Research Cologne, GermanyNadine K. EilsGerman Aerospace Center (DLR), Institute of Materials Research Cologne, GermanyStefan HackemannGerman Aerospace Center (DLR), Institute of Materials Research Cologne, GermanyRavisankar NaraparajuGerman Aerospace Center (DLR), Institute of Materials Research Cologne, GermanyFollow this and additional works at: http://dc.engconfintl.org/thermal_barrier_ivPart of the Materials Science and Engineering CommonsThis Conference Proceeding is brought to you for free and open access by the Proceedings at ECI Digital Archives. It has been accepted for inclusion inThermal Barrier Coatings IV by an authorized administrator of ECI Digital Archives. For more information, please contact franco@bepress.com.Recommended CitationPeter Mechnich, Wolfgang Braue, Nadine K. Eils, Stefan Hackemann, and Ravisankar Naraparaju, "Yttrium oxide a candidate materialfor environmental and thermal barrier coatings" in "Thermal Barrier Coatings IV", U. Schulz, German Aerospace Center; M. Maloney,Pratt & Whitney; R. Darolia, GE Aviation (retired) Eds, ECI Symposium Series, (2015). http://dc.engconfintl.org/thermal_barrier_iv/30Wednesday, June 25, 2014  Session 4 YTTRIUM OXIDE (Y2O3) – A CANDIDATE MATERIAL FOR ENVIRONMENTAL AND THERMAL BARRIER COATINGS  Peter Mechnich, German Aerospace Center (DLR), Institute of Materials Research Cologne, Germany peter.mechnich@dlr.de  Wolfgang Braue, German Aerospace Center (DLR), Institute of Materials Research Cologne, Germany Nadine K. Eils, German Aerospace Center (DLR), Institute of Materials Research Cologne, Germany Stefan Hackemann, German Aerospace Center (DLR), Institute of Materials Research Cologne, Germany Ravisankar Naraparaju, German Aerospace Center (DLR), Institute of Materials Research Cologne, Germany   Key Words: Y2O3, EBC, CMC, CMAS  Environmental barrier coatings (EBC) are considered to pave the way for the application of ceramic matrix composites (CMC) in turbine engines. Low thermal mismatch, good adherence, microstructural stability and resistance against high-temperature corrosion are key issues. Due to its high chemical stability and low thermal mismatch, Y2O3 is considered an attractive EBC material in particular for Al2O3/Al2O3 CMC. A variety of laboratory-scale specimen as well as prototypic engine components were coated with Y2O3 by means of air plasma spraying (APS). At high temperature Y2O3 and Al2O3 exhibit formation of a thin interdiffusion and reaction zone consisting of Y-aluminates providing a good coating adherence.  As a result, APS Y2O3-coated Al2O3/Al2O3 CMC exhibit a high durability versus thermal cycling. APS Y2O3-coatings exhibit a high resistance against recession by inorganic particles commonly referred to as CMAS corrosion. Infiltration of molten CMAS is inhibited by a dense reaction layer as well as the specific coating microstructure. Columnar Y2O3 coatings manufactured by chemical and physical vapor deposition (MO-CVD, EB-PVD) exhibit inferior resistance to CMAS infiltration but outperform yttria stabilized zirconia (YSZ) coatings. Therefore Y2O3 may also be suitable as a CMAS-resistant overlay for standard YSZ TBC.   

Yttrium oxide a candidate material for environmental and thermal barrier coatings

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Yttrium oxide a candidate material for environmental and thermal barrier coatings

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