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294 results on '"Pint, B.A."'

142. Transformation of Al2O3 to LiAlO2 in Pb–17Li at 800°C

Author

Pint, B.A. and More, K.L.

Subjects
*ATMOSPHERIC temperature, *OXIDATION, *FUSION (Phase transformation), *LITHIUM
Abstract

Abstract: A FeCrAl substrate was pre-oxidized for 2h at 1000°C to thermally grow an external Al2O3 scale and then isothermally exposed to Pb–17at.% Li for 1000h at 800°C to determine if this layer would protect the underlying alloy from dissolution. After exposure, a small mass gain was measured, indicating that the layer did inhibit dissolution. However, characterization of the external layer determined that it had transformed to LiAlO2 with an increased thickness and a much larger grain size than the original layer. This observation has implications for the use of Al2O3 as a permeation barrier in Pb–Li cooled fusion blanket systems. [Copyright &y& Elsevier]

Published
2008
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147. List of contributors

Author

Allison, T.C., Ames, R., Anderson, M., Bennett, J.A., Brese, R.G., Brun, K., Bueno, P.C., Carlson, M., Chordia, L., Clementoni, E.M., Dennis, R.A., Ertas, B., Fleming, D., Fourspring, P., Friedman, P., Held, T., Lawson, S., Moisseytsev, A., Moore, J., Musgrove, G., Pasch, J., Pelton, R., Pint, B.A., Poerner, M., Ridens, B., Rimpel, A., Rochau, G., Scammell, W., Shiferaw, D., Sienicki, J.J., Stekli, J., Strakey, P., Sullivan, S., Thimsen, D., Turchi, C.S., Weiland, N.T., Wilkes, J., and Wright, S.

Published
2017
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148. Compatibility of SiC with ODS FeCrAl in flowing Pb-Li at 600°–700 °C.

Author

Pint, B.A., Jun, J., and Romedenne, M.

Subjects
*COOLANTS, *FUSION reactors, *ALLOYS, *BLANKETS, *CARBIDES, *ALUMINUM-lithium alloys
Abstract

To establish the maximum operating temperature for the dual coolant lead lithium (DCLL) blanket concept, thermal convection loop (TCL) experiments were conducted for 1000 h with a peak temperature of 700 °C to determine compatibility with commercial eutectic Pb∼17at.%Li. Two TCLs were fabricated from alloy APMT (FeCrAlMo) and the baseline TCL experiment contained only APMT specimens. The second TCL experiment exposed more fusion relevant CVD SiC and ODS Fe-10Cr-6Al specimens in the hot and cold legs. In the second experiment, the mass losses were much larger for the ODS FeCrAl specimens and most of the CVD SiC specimens experienced a mass gain as SiC reacted to form an Fe- and Cr-rich carbide reaction product. Dissolved Fe and Cr reacted with the SiC and removing Fe and Cr from the liquid appeared to increase ODS FeCrAl dissolution. Such a dissimilar material interaction appears consistent with thermodynamic calculations. Significant attack at the top of the hot leg in both experiments suggests that the Pb-Li compatibility of FeCrAl alloys is inadequate at 700 °C in a flowing environment and the maximum PbLi temperature is < 675 °C. [ABSTRACT FROM AUTHOR]

Published
2021
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150. Steam oxidation behavior of Ni-base superalloys 690, 725 and X-750 at 600 and 650 °C.

Author

Tan, L., Chen, T., and Pint, B.A.

Subjects
*HEAT resistant alloys, *NICKEL alloys, *INCONEL, *SCANNING transmission electron microscopy, *ENERGY dispersive X-ray spectroscopy, *STEAM
Abstract

• Distinct behavior exists between the 600 and 650 °C steam exposures. • The least metal loss occurred for alloy X-750 at 600 °C while alloy 690 at 650 °C. • The steam exposure primarily resulted in Cr-rich oxide with Al 2 O 3 internal oxidation. • The experiment-identified phases generally agree well with thermodynamic calculations. The 1-bar steam oxidation behavior of Ni-base superalloys 690, 725, and X-750 was evaluated at 600 and 650 °C for up to 5000 h. In addition to monitoring mass changes, microstructures of the 5000-h-exposed samples were characterized using scanning and transmission electron microscopy and energy dispersive x-ray spectroscopy. Together with thermodynamic calculations, the scale constitution and possible exfoliation was discussed. Alloy X-750 exhibited the best resistance to steam oxidation with the least metal thickness loss at 600 °C while alloy 690 at 650 °C. Alloy 725 exhibited more than two times metal thickness loss than the other two alloys at 650 °C. [ABSTRACT FROM AUTHOR]

Published
2019
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