Tin Addition to Improve the Oxidation Behaviour of NbSs/Nb5Si3 Based In Situ Composite

Stephane Knittel; Stéphane Mathieu; Michel Vilasi

doi:10.4028/www.scientific.net/AMR.278.575

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 278Tin Addition to Improve the Oxidation Behaviour of...

Tin Addition to Improve the Oxidation Behaviour of Nb_Ss/Nb₅Si₃ Based In Situ Composite

Abstract:

This work focuses on the effect of tin additions (2, 5 and 8%) to the MASC alloy (Nb-25Ti-8Hf-2Cr-2Al-18Si) on the microstructure and the oxidation behaviour at 815°C in air. The alloys are mainly constituted of a niobium solid solution plus the () Nb5Si3 silicides. For the higher Sn additions (5 and 8%), a fourth phase is evidenced: it is enriched in Sn and has a crystal structure close to Nb3Sn. The oxidation resistance of these alloys is clearly improved by tin additions: the oxygen inward diffusion is hindered and consequently the fragmentation of the silicides is avoided. Cracks in silicides are no longer observed for the MASC containing 8%Sn. This effect is not attributed to a better efficiency of the oxide scales but rather to the reduction of the niobium solid solution fraction with tin additions.

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Periodical:

Advanced Materials Research (Volume 278)

Pages:

575-580

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.278.575

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Online since:

July 2011

Authors:

Stephane Knittel, Stéphane Mathieu, Michel Vilasi

Keywords:

Niobium, Oxidation, Silicide, TiN

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References

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