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Magnetron-sputtered oxidation protection coatings for Mo-Si-B-alloys

Lange, Annika/WF-HF and Braun, Reinhold and Heilmaier, Martin (2012) Magnetron-sputtered oxidation protection coatings for Mo-Si-B-alloys. Materials Science and Technology 2012, Pittsburgh, USA.

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Abstract

Three phase Mo-Si-B alloys were coated with intermetallic layers to impede low temperature pest-oxidation and to improve the oxidation resistance at temperatures above 1000 °C. The about 7 µm thick coatings of MoSi2 and Mo5Si3 phases were produced by magnetron sputtering and subsequent annealing in vacuum. Both molybdenum silicides were doped with 10 – 20 at. % boron to prevent pesting by formation of a protective borosilicate scale. Furthermore, an alumina forming Al8Mo3 layer was deposited. All coatings were dense and well adherent to the Mo-Si-B substrate materials. To suppress interdiffusion between coating and substrate, a 2 µm thick intermediate barrier layer of Mo5SiB2 was applied. The coated samples were exposed to laboratory air at temperatures between 750 and 1300°C for up to 100 h under isothermal conditions. Microstructural examinations were performed using GD-OES, XRD and SEM. The scope of this talk is on oxide formation, interdiffusion and phase evolution.

Item URL in elib:https://elib.dlr.de/78622/
Document Type:Conference or Workshop Item (Speech)
Title:Magnetron-sputtered oxidation protection coatings for Mo-Si-B-alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lange, Annika/WF-HFannika.lange (at) dlr.deUNSPECIFIED
Braun, Reinholdreinhold.braun (at) dlr.deUNSPECIFIED
Heilmaier, MartinUNSPECIFIEDUNSPECIFIED
Date:10 October 2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:Magnetron sputtering, Mo-Si-B, oxidation protection
Event Title:Materials Science and Technology 2012
Event Location:Pittsburgh, USA
Event Type:international Conference
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:19 Nov 2012 09:29
Last Modified:19 Nov 2012 09:29

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