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Chromium Diffusion Coatings for Mo-Based Silicides to Improve Their Oxidation Resistance

Title data

Beck, Katharina ; Hinrichs, Frauke ; Oskay, Ceyhun ; Ulrich, Anke Silvia ; Heilmaier, Martin ; Galetz, Mathias C.:
Chromium Diffusion Coatings for Mo-Based Silicides to Improve Their Oxidation Resistance.
In: Coatings. Vol. 13 (2023) Issue 10 . - 1712.
ISSN 2079-6412
DOI: https://doi.org/10.3390/coatings13101712

Abstract in another language

The oxidation behavior of two ternary Mo-Si-Ti alloys (eutectic Mo-20.0Si-52.8Ti and eutectoid Mo-21.0Si-34.0Ti) was investigated using thermogravimetric analysis at 700 °C, 900 °C, and 1300 °C for 100 h. The eutectic alloy formed a protective SiO2/TiO2 oxide scale, whereas the eutectoid alloy showed catastrophic oxidation. To improve the oxidation behavior of these alloys, chromium diffusion coatings deposited via pack cementation on the surface were investigated. Cr coatings were found to be suitable for improving oxidation resistance at 700 °C and 900 °C but failed at 1300 °C due to the evaporation of thin scales. At 700 °C and 900 °C, the formation of a Cr2O3 scale was proven on the Ti-rich/Mo-lean eutectic composition. After exposure, the Ti-lean/Mo-rich eutectoid composition, which is intrinsically more prone to oxidation, was found to form a continuous Cr2O3 scale only at 700 °C.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: chromium coating; high-temperature applications; oxidation resistance; pack cementation; silicides
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Metals and Alloys > Chair Metals and Alloys - Univ.-Prof. Dr.-Ing. Uwe Glatzel
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Central research institutes
Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 000 Computer Science, information, general works
600 Technology, medicine, applied sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 16 Oct 2023 08:02
Last Modified: 16 Oct 2023 08:02
URI: https://eref.uni-bayreuth.de/id/eprint/87211