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Y2SiO5 environmental barrier coatings for niobium silicide based materials

Lange, Annika and Braun, Reinhold and Mechnich, Peter and Büttner, Claudia and Schulz, Uwe and Portebois, Leo and Mathieu, Stephane and Vilasi, Michel and Drawin, Stefan (2014) Y2SiO5 environmental barrier coatings for niobium silicide based materials. Microscopy of Oxidation 9, 14.04.14-16.04.14, Nottingham, Groß-Britannien.

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The oxidation behaviour of Nb-silicide-based alloys, considered as potential ultra-high temperature material for gas-turbine engine applications, can be improved by chromia-silica forming coatings with M7Si6 structure. To stabilise the protective oxide scales against water vapour corrosion in combustion atmospheres, environmental barrier coatings (EBCs) of yttrium silicate were deposited on an FeB-modified M7Si6-based bond coat using magnetron sputtering. The 15-20 µm thick ceramic top coats with an approximate chemical composition of 25Y-13Si-62O (at.%) were dense and amorphous after deposition. They were annealed in vacuum to get a crystalline structure with the predominant phase Y2SiO5. Samples with this EBC system were tested in rapidly flowing water vapour at temperatures between 1100°C and 1300°C for up to 16 h. At 1100°C and 1200°C, significantly reduced mass gains were determined for samples with yttrium silicate top coat in comparison to those only coated with FeB-containing layers. The EBC partially transformed into the Y2Si2O7 phase and exhibited micro-porosity. At 1300°C, the yttrium silicate layer decomposed forming yttrium oxides.

Item URL in elib:https://elib.dlr.de/89359/
Document Type:Conference or Workshop Item (Poster)
Title:Y2SiO5 environmental barrier coatings for niobium silicide based materials
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lange, Annikaannika.lange (at) dlr.deUNSPECIFIED
Braun, Reinholdreinhold.braun (at) dlr.deUNSPECIFIED
Mechnich, Peterpeter.mechnich (at) dlr.deUNSPECIFIED
Schulz, Uweuwe.schulz (at) dlr.deUNSPECIFIED
Portebois, LeoInstitut Jean Lamour, NancyUNSPECIFIED
Mathieu, StephaneInstitut Jean Lamour, NancyUNSPECIFIED
Vilasi, MichelInstitut Jean Lamour, NancyUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Niobium silicide, M7Si6-based bond coat, yttrium silicate, environmental barrier coating, magnetron sputtering, water vapour corrosion
Event Title:Microscopy of Oxidation 9
Event Location:Nottingham, Groß-Britannien
Event Type:international Conference
Event Dates:14.04.14-16.04.14
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Lange, Annika
Deposited On:15 Sep 2014 09:05
Last Modified:15 Sep 2014 09:05

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