Evaluation of Lifetime of FGMs Disilicide Coatings for γ-TiAl Intermetallic Compound

Masayuki Ohshima; Saleh B. Abu Suilik; Toshimitsu Tetsui; Kazuhiro Hasezaki

doi:10.4028/www.scientific.net/MSF.631-632.495

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HomeMaterials Science ForumMaterials Science Forum Vols. 631-632Evaluation of Lifetime of FGMs Disilicide Coatings...

Evaluation of Lifetime of FGMs Disilicide Coatings for γ-TiAl Intermetallic Compound

Abstract:

The NbSi2/Nb/-TiAl and NbSi2/Nb functionally graded materials (FGMs) were prepared and their tolerances tested by exposing them to temperatures from 1050 °C to 1250 °C under vacuum and in air. Oxygen resistivity was estimated from metallographic investigations. The FGM lifetime was estimated by using a diffusion equation that considers the disappearance of the NbSi2 and Nb interlayer. These occurred during NbSi2 oxidation and Si diffusion from NbSi2 to Nb and interdiffusion between Nb and -TiAl. The results were validated by diffusion equations.

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Periodical:

Materials Science Forum (Volumes 631-632)

Pages:

495-500

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.631-632.495

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Online since:

October 2009

Authors:

Masayuki Ohshima, Saleh B. Abu Suilik, Toshimitsu Tetsui, Kazuhiro Hasezaki

Keywords:

General Oxidation, Intermetallic Compound (IMC), Lifetime, Molten Salt, Oxidation Resistance Coatings, Siliconization, Titanium Aluminide, Volume Diffusion

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References

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