Empirical Analysis of Lifetimes for Disilicide Coatings on a γ-TiAl Intermetallic Compound
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概要
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The NbSi2/Nb/γ-TiAl and NbSi2/Nb functionally graded materials (FGMs) were prepared and their tolerances tested by exposing them to temperatures from 1323 K to 1523 K 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 γ-TiAl. The results were validated by diffusion equations. The results indicate that a coating used at 1323 K for 380 h requires a NbSi2+Nb coating thickness of more than 77 μm.
- 2009-07-15
著者
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OHSHIMA Masayuki
Department of Materials Science, Shimane University
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TETSUI Toshimitsu
Institute for Materials Research, Tohoku University
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HASEZAKI Kazuhiro
Department of Materials Science, Shimane University
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Ohshima Masayuki
Department Of Materials Science Shimane University
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Hasezaki Kazuhiro
Department Of Materials Science Shimane University
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Ohshima Masayuki
Department Of Anesthesiology And Pain Medicine Juntendo University School Of Medicine
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Tetsui Toshimitsu
Institute For Materials Research Tohoku University
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Hasezaki Kazuhiro
Department Of Materials Science Faculty Of Science And Engineering Shimane University
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