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- W173298819 abstract "Emittance, catalytic efficiency, and dynamic oxidation resistance were determined for Ti-14Al-21Nb exposed to simulated hypersonic flight conditions at a surface temperature of 982 C for up to 8 hr. The emittance was low before testing (about 0.3), but high after testing (0.85 to 0.89). Catalytic efficiencies were high which means that during exposure to hypersonic conditions Ti-14Al-21Nb will experience a large amount of heating due to recombination of gaseous atoms at the surface. Oxides formed on the surface spalled readily, beginning with the first exposure cycle. Oxygen diffusion into the base metal was observed. The solubility limit of oxygen in the base metal was estimated to be 12.5 at.%, and the diffusion coefficient for oxygen in the base metal was 0.0234 (sq cm/sec) exp (-45090 (cal/mole. deg K)/RT) between 704 C and 982 C. The oxide was composed of several layers of different color but similar composition: TiO2, Al2O3, TiN, and Ti3O5 were identified by x-ray diffraction." @default.
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- W173298819 date "1989-01-01" @default.
- W173298819 modified "2023-09-27" @default.
- W173298819 title "Emittance, catalysis, and dynamic oxidation of Ti-14Al-21Nb" @default.
- W173298819 hasPublicationYear "1989" @default.
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