Characterization of chromia scales formed in supercritical carbon dioxide.

Autor:	Pint, B. A., Unocic, K. A., Brese, R. G., Keiser, J. R.
Předmět:	SUPERCRITICAL carbon dioxide CHROMIUM oxide OXIDATION MATERIALS at high temperatures SCANNING transmission electron microscopy SOLAR energy
Zdroj:	Materials at High Temperatures; Jan-May2018, Vol. 35 Issue 1-3, p39-49, 11p, 2 Color Photographs, 4 Black and White Photographs, 1 Chart, 8 Graphs
Abstrakt:	Initial experimental work at 700°-800 °C is in progress to develop a lifetime model for supercritical CO2 (sCO2) compatibility for a 30-year lifetime of a >700 °C concentrated solar power system. Nickel-based alloys 282, 740H and 625 and Fe-based alloy 25 are being evaluated in 500-h cycles at 1 and 300 bar, and 10-h cycles in 1 bar industrial grade CO2. The alloys showed similar low rates of oxidation in 1 and 300 bar CO2 in 500-h cycles at 750 °C. However, in 10-h cycles, alloy 25 showed accelerated attack at 700° and 750 °C. Transmission electron microscopy scale cross-sections on alloy 25 after 1000 h at 700 °C in sCO2 and in air only showed a small row of carbides beneath the scale in the former environment. Similar characterisation was performed on alloys 625 and 282 after sCO2 exposure at 750 °C. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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