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

Abstract:

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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.

Info:

Periodical:

Materials Science Forum (Volumes 631-632)

Edited by:

Akira Kawasaki, Akinaga Kumakawa and Masayuki Niino

Pages:

495-500

DOI:

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

Citation:

M. Ohshima et al., "Evaluation of Lifetime of FGMs Disilicide Coatings for γ-TiAl Intermetallic Compound", Materials Science Forum, Vols. 631-632, pp. 495-500, 2010

Online since:

October 2009

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$35.00

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